Contact angle(CA)is an important material characteristic in the field of pavement materials.It has been instrumental to the development of new and evolving research areas such as the adhesion of pavement components,hy...Contact angle(CA)is an important material characteristic in the field of pavement materials.It has been instrumental to the development of new and evolving research areas such as the adhesion of pavement components,hydrophobic and superhydrophobic concretes,etc.Yet,there are several inconsistencies between studies when it comes to the CA characterization of various pavement materials.This is in part due to the lack of sufficient research and proper documentation of existing knowledge on the CA characterization of pavement materials.This current study has documented and analyzed the processes of measuring the CA of various pavement materials.This includes sample preparation,test conditions,and recommended practices.Studies on the refinement of existing methods for the estimation of CA were also reviewed.The relationships between CA and various pavement and material performances were also reviewed.The increased need for resilient pavements calls for the search for new and effective material characteristics parameters.CA measurements have the potential to change how the properties of fresh cementitious mixes are being assessed.The sessile drop method offers more flexibility for characterizing the CA of pavement materials.The potential application of CA for the improvement and development of new material performance characteristics was discussed.Insights on ways to advance the evaluation of hydrophobic characteristics of pavements were outlined.For example,the use of de-ionized or distilled water for the assessment of hydrophobic properties of concrete does not reflect the moisture condition in the field.CA measurements at different water PH levels should be carried out to replicate the true service condition of the concretes.展开更多
Sustainable and resilient pavement infrastructure is critical for current economic and environmental challenges.In the past 10 years,the pavement infrastructure strongly supports the rapid development of the global so...Sustainable and resilient pavement infrastructure is critical for current economic and environmental challenges.In the past 10 years,the pavement infrastructure strongly supports the rapid development of the global social economy.New theories,new methods,new technologies and new materials related to pavement engineering are emerging.Deterioration of pavement infrastructure is a typical multi-physics problem.Because of actual coupled behaviors of traffic and environmental conditions,predictions of pavement service life become more and more complicated and require a deep knowledge of pavement material analysis.In order to summarize the current and determine the future research of pavement engineering,Journal of Traffic and Transportation Engineering(English Edition)has launched a review paper on the topic of"New innovations in pavement materials and engineering:A review on pavement engineering research 2021".Based on the joint-effort of 43 scholars from 24 well-known universities in highway engineering,this review paper systematically analyzes the research status and future development direction of 5 major fields of pavement engineering in the world.The content includes asphalt binder performance and modeling,mixture performance and modeling of pavement materials,multi-scale mechanics,green and sustainable pavement,and intelligent pavement.Overall,this review paper is able to provide references and insights for researchers and engineers in the field of pavement engineering.展开更多
The objective of this paper was to develop a comprehensive evaluation method and index to evaluate the performance of sealants and fillers for cracks in asphalt concrete pavements using the method of principal compone...The objective of this paper was to develop a comprehensive evaluation method and index to evaluate the performance of sealants and fillers for cracks in asphalt concrete pavements using the method of principal component analysis. The performance experiments including cone penetration, softening point, flow, resilience and tension at low temperature respectively were conducted by reference of ASTM D5329 for eight sealants and fillers often used in China. There by a principal component model was developed and weight of every index was calculated. The experimental results show that there are significantly different performances for sealants and fillers often used in China. Principal component analysis is an objective method that evaluates and selects the performance of sealants and fillers for cracks in asphalt concrete pavements.展开更多
As an important part of steel bridge deck,the engineering quality and service condition of steel bridge deck pavement(SBDP)directly affects the capacity and operational efficiency of the bridge.This paper reviews the ...As an important part of steel bridge deck,the engineering quality and service condition of steel bridge deck pavement(SBDP)directly affects the capacity and operational efficiency of the bridge.This paper reviews the history of the development of SBDP in China over the past 20 years from the exploration stage,rapid development stage and prosperity stage.The development and application of SBDP at different stages are discussed in terms of materials,structure,design,performance evaluation,maintenance and rehabilitation,respectively.The advantages and disadvantages of different pavement materials and structures,and the application of different research methods are summarized.The review shows that the improvement of pavement materials and structures and the development of new materials should be further studied on the multi-scale to enhance the durability of pavement materials,so as to extend the service life of pavements.The design method of SBDP related to the synergistic effect of vehicle,pavement and bridge should be established,and the design concept and method standard of rigid base pavement structure should be improved and formulate a complete design standard.In addition,multi-disease intelligent identification system and equipment should be studied to track the entire course of disease development in real time.And it is necessary to develop appropriate algorithms to select and classify the complex data of disease and maintenance history.展开更多
We investigated microstructure morphologies of three asphalts（SK, Karamay, and Esso） used in China using atomic force microscopy（AFM）. The topography and phase contrast images were obtained. Topographic profile an...We investigated microstructure morphologies of three asphalts（SK, Karamay, and Esso） used in China using atomic force microscopy（AFM）. The topography and phase contrast images were obtained. Topographic profile and three dimensional images were described. Roughnesses of microstructure were calculated. And the chemical compositions of asphalt were tested to explain the microstructural mechanism of the asphalt. The results show that the topography and phase image in atomic force microscopy are appropriate to evaluate the microstructure of the asphalt binder. There are significant differences in microstructural morphologies including bee-like structure, topographic profile, 3D image, and roughness for three asphalts in this study. There are three different phases in microstructure of asphalt binder. The oil source and chemical composition of asphalt, especially asphaltenes content have a great influence on the microstructure.展开更多
Dynamic cone penetrometer is mainly used as an in situ device and laboratory application, in a mould, has rarely been reported due to the confining effect. In this study, a dynamic lightweight cone penetrometer that c...Dynamic cone penetrometer is mainly used as an in situ device and laboratory application, in a mould, has rarely been reported due to the confining effect. In this study, a dynamic lightweight cone penetrometer that can be used in a CBR （California bearing ratio） mould in the laboratory as well as in the field, with similar results, was developed. The results show that the influence of the mould confinement can be eliminated when the hammer mass is 2.25 kg. A strong correlation was found between CBR values and the new dynamic lightweight penetrometer index, for six fine-grained soil samples, with different moisture contents, used in this study.展开更多
This project integrates recent innovations of recycled materials used in designing and building sustainable pavements. An increasing environmental awareness and the demand for improving economic and construction effic...This project integrates recent innovations of recycled materials used in designing and building sustainable pavements. An increasing environmental awareness and the demand for improving economic and construction efficiencies, through measures such as con- struction warrantees and goals to reduce air pollution under the Kyoto Protocol, have increased the efforts to implement sustainable materials in roadways. The objective of this research is to develop a systematic approach toward selecting optimum combinations of sustainable materials for the construction of asphalt pavements. The selected materials, warm mix asphalt （WMA）, recycled asphalt shingles {RAS）I and reclaimed asphalt pave- ment {RAP） were incorporated in this study. The results of this research are intended to serve as guidelines in the selection of the mixed sustainable materials for asphalt pave- ments. The approach developed from this project draws upon previous research efforts integrating graphical modeling with optimizing the amount of sustainable materials based on the performance. With regard to moisture susceptibility and rutting potential test re- suits, as well as the MIM analysis based on a 95% confidence interval, the rutting perfor- mance and moisture susceptibility of asphalt mixtures are not significantly different regardless of the percentages of RAS, RAP, or WMA. The optimum mixture choices could be made by the plant emission rankings with consideration of the optimal WMA types, per- centages of RAS/RAP, and WMA production temperatures. The WMA mixtures prepared with 75% RAP and Advera WMA have produced the lowest CO2 emissions among the investigated mixture types.展开更多
The increasing adoption of new energy vehicles has promoted the alleviation of petroleum fuel consumption and environmental problems.The charging and endurance capability problems of these vehicles are main constraint...The increasing adoption of new energy vehicles has promoted the alleviation of petroleum fuel consumption and environmental problems.The charging and endurance capability problems of these vehicles are main constraints for their further development.The intelligent e-Road pavements can provide wireless charging,presenting a potential solution to the above deficiencies.This paper systematically introduced the composition and working principle of wireless charging technology to advance its development and application.Moreover,the main influencing factors of electric energy transmission efficiency on e-Road concerning pavement materials were analysed.The findings showed that the electric energy passed through pavement layers when applying the existing wireless charging technologies that typically use air as the medium.As a result,the transmission efficiency fluctuated owing to various influencing factors,including pavement materials,layers and moisture.This phenomenon is attributed to the performance parameters of wireless charging coils and the power loss caused by the electromagnetic induction characteristics of dielectric pavement materials.Potential solutions for improving the power transmission efficiency of wireless charging pavements were proposed,considering the circuit composition,asphalt concrete gradation type,and pavement structural composition.The methods and models used in previous studies were summarised to evaluate the dielectric loss of asphalt mixtures,and the wireless energy transmission efficiency,application scope,and optimisation methods were put forward.The impact of a commonly used wireless charging coil layout on the structure and service life of wireless charging pavements was analysed,and improvement measures were suggested.展开更多
Particulate matter(PM)in outdoor air pollution is one of the most critical factors that cause serious health problems and even deaths.One significant source of these particles are nonexhaust emissions,which refer to p...Particulate matter(PM)in outdoor air pollution is one of the most critical factors that cause serious health problems and even deaths.One significant source of these particles are nonexhaust emissions,which refer to pollutants that come from sources,like brake,tire,and road wear other than a vehicle's exhaust system.This review focuses on the presence of non-exhaust particles on pavement,encompassing their classification,composition,evaluation,and mitigation.Based on extensive literature,it can be concluded that the quantity of non-exhaust emissions is affected by a combination of complex factors,such as vehicle speed,tire type,and pavement material.Non-exhaust particles can be classified into organic,inorganic,and metal matter,each requiring a distinct analysis and detection method.The effective approaches to managing non-exhaust emissions include water cleaning,utilizing functional pavement materials,and applying chemical reagents to alleviate emission capacity.Finally,this review recommends future research directions such as combining tire-road simulation with environmental monitoring equipment,in the hope that this article will have a positive impact on the mitigation of non-exhaust emissions.展开更多
The textile industry is a pioneer in the industrialization process in Brazil and is relevant to the Brazilian economy. However, it also generates as operational residue a solid waste,commonly called textile sludge. Pa...The textile industry is a pioneer in the industrialization process in Brazil and is relevant to the Brazilian economy. However, it also generates as operational residue a solid waste,commonly called textile sludge. Pavement construction, which mobilizes large volumes of soil, constitutes an alternative to the reuse of residue, especially when stabilization is involved. The use of stabilized soils with the addition of waste can provide technical,economic and environmentally friendly advantages. This research aimed to study the use of chemical stabilization technique with sludge and three additives(lime, cement and asphalt emulsion) applied in base and subbase of pavements. The scope of this study was divided into four phases, i) characterization tests, ii) physical stabilization, iii) chemical stabilization and determination of heavy metals in the sludge, and iv) addition of 10% of textile sludge and chemical stabilizers(lime, cement, and asphalt emulsion) in amounts of 3%, 5% and 7% as additives in a soil, based on the results obtained in the second phase. Test results indicated that the stabilization of mixtures of soil with textile sludge has the potential to be used in pavement layers(base and subbase). The addition of cement promotes the best chemical stabilization for the sludge. The use of textile sludge stabilization presents greater environmental benefits, given the malfunctions and problems that the incorrect waste disposal can cause to the environment.展开更多
To improve the mechanical properties and durability of the cement-stabilized base,rubber particles of three different sizes and with three different contents were optimally selected,the evolution laws of the mechanica...To improve the mechanical properties and durability of the cement-stabilized base,rubber particles of three different sizes and with three different contents were optimally selected,the evolution laws of the mechanical strength and toughness of rubber-particle cement-stabilized gravel(RCSG)under different schemes were determined,and the optimal particle size and content of rubber particles were obtained.On this basis,the durability of the RCSG base was clarified.The results show that with an increase in the rubber particle size and content,the mechanical strength of RCSG gradually decreased,whereas the toughness and transverse deformation ability gradually increased.1%content and 2–4 mm sized RCSG can better balance the relationship between mechanical strength and toughness.The 7 d unconfined compressive strength was 17.7%higher than that of the 4–8 mm RCSG.The 28 d toughness index and ultimate splitting strain can be increased by 9.8%and 6.3 times,respectively,compared with ordinary cement-stabilized gravel(CSG).In terms of durability,compared with CSG,RCSG showed a 3.7%increase in the water stability property of cement-stabilized base with 1%content and 2–4 mm rubber particles,5.5%increase in the frozen coefficient,and 80.6%and 37.9%increase in the fatigue life at 0.70 and 0.85 stress ratio levels,respectively.展开更多
The road is one of the most important civil infrastructures for serving society,where its service quality and life have direct impacts on the safety and comfort of users.Therefore,road construction,condition detection...The road is one of the most important civil infrastructures for serving society,where its service quality and life have direct impacts on the safety and comfort of users.Therefore,road construction,condition detection and monitoring,and timely maintenance are particularly important for engineers.Many engineering applications of industrial informatics approaches,like image processing technology,widely used computer-based algorithms,and advanced sensors,have been initially and gradually applied to roads.This state-of-the-art review first summarized the research on industrial applications of advanced information technologies in recent years,while analyzing and comparing the advantages and disadvantages of each technology.Especially,five topics were focused on road construction,road maintenance with decision strategy,road structure evaluation,smart sensing in the road,and cooperative vehicle infrastructure system.It is expected that advanced industrial informatics can help engineers promote the development of smart,safe,and sustainable roads.展开更多
文摘Contact angle(CA)is an important material characteristic in the field of pavement materials.It has been instrumental to the development of new and evolving research areas such as the adhesion of pavement components,hydrophobic and superhydrophobic concretes,etc.Yet,there are several inconsistencies between studies when it comes to the CA characterization of various pavement materials.This is in part due to the lack of sufficient research and proper documentation of existing knowledge on the CA characterization of pavement materials.This current study has documented and analyzed the processes of measuring the CA of various pavement materials.This includes sample preparation,test conditions,and recommended practices.Studies on the refinement of existing methods for the estimation of CA were also reviewed.The relationships between CA and various pavement and material performances were also reviewed.The increased need for resilient pavements calls for the search for new and effective material characteristics parameters.CA measurements have the potential to change how the properties of fresh cementitious mixes are being assessed.The sessile drop method offers more flexibility for characterizing the CA of pavement materials.The potential application of CA for the improvement and development of new material performance characteristics was discussed.Insights on ways to advance the evaluation of hydrophobic characteristics of pavements were outlined.For example,the use of de-ionized or distilled water for the assessment of hydrophobic properties of concrete does not reflect the moisture condition in the field.CA measurements at different water PH levels should be carried out to replicate the true service condition of the concretes.
基金National Key R&D Program of China(No.2018YFB1600200,2021YFB1600200)National Natural Science Foundation of China(No.51608457,51778038,51808016,51808403,51908057,51908072,51908165,51908331,52008029,52008069,52078018,52078025,52078049,52078209,52108403,52122809,52178417)+9 种基金Marie Sk?odowska-Curie Individual Fellowships of the European Commission’s Horizon 2020 programme(No.101024139)Natural Science Foundation of Heilongjiang Province(No.JJ2020ZD0015)China Postdoctoral Science Foundation funded project(No.BX20180088)Research Capability Enhancement Program for Young Professors of Beijing University of Civil Engineering and Architecture(No.02080921021)Young Scholars of Beijing Talent Program(No.02082721009)Beijing Municipal Natural Science Foundation and Beijing Municipal Education Commission(No.KZ201910016017)German Research Foundation(No.OE 514/15-1(459436571))Fundamental Research Funds for the Central Universities(No.2020kfyXJJS127)Marie Sk?odowska-Curie Individual Fellowships of the European Commission’s Horizon 2020 Programme(No.101030767)Research Fund for High Level Talent Program(No.22120210108)。
文摘Sustainable and resilient pavement infrastructure is critical for current economic and environmental challenges.In the past 10 years,the pavement infrastructure strongly supports the rapid development of the global social economy.New theories,new methods,new technologies and new materials related to pavement engineering are emerging.Deterioration of pavement infrastructure is a typical multi-physics problem.Because of actual coupled behaviors of traffic and environmental conditions,predictions of pavement service life become more and more complicated and require a deep knowledge of pavement material analysis.In order to summarize the current and determine the future research of pavement engineering,Journal of Traffic and Transportation Engineering(English Edition)has launched a review paper on the topic of"New innovations in pavement materials and engineering:A review on pavement engineering research 2021".Based on the joint-effort of 43 scholars from 24 well-known universities in highway engineering,this review paper systematically analyzes the research status and future development direction of 5 major fields of pavement engineering in the world.The content includes asphalt binder performance and modeling,mixture performance and modeling of pavement materials,multi-scale mechanics,green and sustainable pavement,and intelligent pavement.Overall,this review paper is able to provide references and insights for researchers and engineers in the field of pavement engineering.
基金Funded by the National Natural Science Foundation of China(Nos.51408287 and 51668038)the Rolls Supported by Program for Changjiang Scholars and Innovative Research Team in University(IRT_15R29)+2 种基金the Distinguished Young Scholars Fund of Gansu Province(1606RJDA318)the Natural Science Foundation of Gansu Province(1506RJZA064)the Excellent Program of Lanzhou Jiaotong University(201606)
文摘The objective of this paper was to develop a comprehensive evaluation method and index to evaluate the performance of sealants and fillers for cracks in asphalt concrete pavements using the method of principal component analysis. The performance experiments including cone penetration, softening point, flow, resilience and tension at low temperature respectively were conducted by reference of ASTM D5329 for eight sealants and fillers often used in China. There by a principal component model was developed and weight of every index was calculated. The experimental results show that there are significantly different performances for sealants and fillers often used in China. Principal component analysis is an objective method that evaluates and selects the performance of sealants and fillers for cracks in asphalt concrete pavements.
基金The authors appreciate the financial support from the National Natural Science Foundation of China(No.51878167)Qing Lan Project of Jiangsu Province。
文摘As an important part of steel bridge deck,the engineering quality and service condition of steel bridge deck pavement(SBDP)directly affects the capacity and operational efficiency of the bridge.This paper reviews the history of the development of SBDP in China over the past 20 years from the exploration stage,rapid development stage and prosperity stage.The development and application of SBDP at different stages are discussed in terms of materials,structure,design,performance evaluation,maintenance and rehabilitation,respectively.The advantages and disadvantages of different pavement materials and structures,and the application of different research methods are summarized.The review shows that the improvement of pavement materials and structures and the development of new materials should be further studied on the multi-scale to enhance the durability of pavement materials,so as to extend the service life of pavements.The design method of SBDP related to the synergistic effect of vehicle,pavement and bridge should be established,and the design concept and method standard of rigid base pavement structure should be improved and formulate a complete design standard.In addition,multi-disease intelligent identification system and equipment should be studied to track the entire course of disease development in real time.And it is necessary to develop appropriate algorithms to select and classify the complex data of disease and maintenance history.
基金Funded by the National Natural Science Foundation of China(Nos.51408287,and 51668038)the Rolls Supported by Program for Changjiang Scholars and Innovative Research Team in University(IRT_15R29)+2 种基金the Distinguished Young Scholars Fund of Gansu Province(1606RJDA318)the Natural Science Foundation of Gansu Province(1506RJZA064)the Excellent Program of Lanzhou Jiaotong University(201606)
文摘We investigated microstructure morphologies of three asphalts（SK, Karamay, and Esso） used in China using atomic force microscopy（AFM）. The topography and phase contrast images were obtained. Topographic profile and three dimensional images were described. Roughnesses of microstructure were calculated. And the chemical compositions of asphalt were tested to explain the microstructural mechanism of the asphalt. The results show that the topography and phase image in atomic force microscopy are appropriate to evaluate the microstructure of the asphalt binder. There are significant differences in microstructural morphologies including bee-like structure, topographic profile, 3D image, and roughness for three asphalts in this study. There are three different phases in microstructure of asphalt binder. The oil source and chemical composition of asphalt, especially asphaltenes content have a great influence on the microstructure.
文摘Dynamic cone penetrometer is mainly used as an in situ device and laboratory application, in a mould, has rarely been reported due to the confining effect. In this study, a dynamic lightweight cone penetrometer that can be used in a CBR （California bearing ratio） mould in the laboratory as well as in the field, with similar results, was developed. The results show that the influence of the mould confinement can be eliminated when the hammer mass is 2.25 kg. A strong correlation was found between CBR values and the new dynamic lightweight penetrometer index, for six fine-grained soil samples, with different moisture contents, used in this study.
基金partially funded by the University Transportation Center for Materials in Sustainable Transportation Infrastructure at Michigan Technological University through the United States Department of Transportation(USDOT)
文摘This project integrates recent innovations of recycled materials used in designing and building sustainable pavements. An increasing environmental awareness and the demand for improving economic and construction efficiencies, through measures such as con- struction warrantees and goals to reduce air pollution under the Kyoto Protocol, have increased the efforts to implement sustainable materials in roadways. The objective of this research is to develop a systematic approach toward selecting optimum combinations of sustainable materials for the construction of asphalt pavements. The selected materials, warm mix asphalt （WMA）, recycled asphalt shingles {RAS）I and reclaimed asphalt pave- ment {RAP） were incorporated in this study. The results of this research are intended to serve as guidelines in the selection of the mixed sustainable materials for asphalt pave- ments. The approach developed from this project draws upon previous research efforts integrating graphical modeling with optimizing the amount of sustainable materials based on the performance. With regard to moisture susceptibility and rutting potential test re- suits, as well as the MIM analysis based on a 95% confidence interval, the rutting perfor- mance and moisture susceptibility of asphalt mixtures are not significantly different regardless of the percentages of RAS, RAP, or WMA. The optimum mixture choices could be made by the plant emission rankings with consideration of the optimal WMA types, per- centages of RAS/RAP, and WMA production temperatures. The WMA mixtures prepared with 75% RAP and Advera WMA have produced the lowest CO2 emissions among the investigated mixture types.
基金the financial support provided by the Fundamental Research Funds for the Central Universities(grant number:2572022BJ012572022DX09)the Key Research and Development Program of Heilongjiang Province(grant number:GZ20220062)。
文摘The increasing adoption of new energy vehicles has promoted the alleviation of petroleum fuel consumption and environmental problems.The charging and endurance capability problems of these vehicles are main constraints for their further development.The intelligent e-Road pavements can provide wireless charging,presenting a potential solution to the above deficiencies.This paper systematically introduced the composition and working principle of wireless charging technology to advance its development and application.Moreover,the main influencing factors of electric energy transmission efficiency on e-Road concerning pavement materials were analysed.The findings showed that the electric energy passed through pavement layers when applying the existing wireless charging technologies that typically use air as the medium.As a result,the transmission efficiency fluctuated owing to various influencing factors,including pavement materials,layers and moisture.This phenomenon is attributed to the performance parameters of wireless charging coils and the power loss caused by the electromagnetic induction characteristics of dielectric pavement materials.Potential solutions for improving the power transmission efficiency of wireless charging pavements were proposed,considering the circuit composition,asphalt concrete gradation type,and pavement structural composition.The methods and models used in previous studies were summarised to evaluate the dielectric loss of asphalt mixtures,and the wireless energy transmission efficiency,application scope,and optimisation methods were put forward.The impact of a commonly used wireless charging coil layout on the structure and service life of wireless charging pavements was analysed,and improvement measures were suggested.
基金supported by the National Natural Science Foundation of China(Grant Nos.52311530081,52122809).
文摘Particulate matter(PM)in outdoor air pollution is one of the most critical factors that cause serious health problems and even deaths.One significant source of these particles are nonexhaust emissions,which refer to pollutants that come from sources,like brake,tire,and road wear other than a vehicle's exhaust system.This review focuses on the presence of non-exhaust particles on pavement,encompassing their classification,composition,evaluation,and mitigation.Based on extensive literature,it can be concluded that the quantity of non-exhaust emissions is affected by a combination of complex factors,such as vehicle speed,tire type,and pavement material.Non-exhaust particles can be classified into organic,inorganic,and metal matter,each requiring a distinct analysis and detection method.The effective approaches to managing non-exhaust emissions include water cleaning,utilizing functional pavement materials,and applying chemical reagents to alleviate emission capacity.Finally,this review recommends future research directions such as combining tire-road simulation with environmental monitoring equipment,in the hope that this article will have a positive impact on the mitigation of non-exhaust emissions.
文摘The textile industry is a pioneer in the industrialization process in Brazil and is relevant to the Brazilian economy. However, it also generates as operational residue a solid waste,commonly called textile sludge. Pavement construction, which mobilizes large volumes of soil, constitutes an alternative to the reuse of residue, especially when stabilization is involved. The use of stabilized soils with the addition of waste can provide technical,economic and environmentally friendly advantages. This research aimed to study the use of chemical stabilization technique with sludge and three additives(lime, cement and asphalt emulsion) applied in base and subbase of pavements. The scope of this study was divided into four phases, i) characterization tests, ii) physical stabilization, iii) chemical stabilization and determination of heavy metals in the sludge, and iv) addition of 10% of textile sludge and chemical stabilizers(lime, cement, and asphalt emulsion) in amounts of 3%, 5% and 7% as additives in a soil, based on the results obtained in the second phase. Test results indicated that the stabilization of mixtures of soil with textile sludge has the potential to be used in pavement layers(base and subbase). The addition of cement promotes the best chemical stabilization for the sludge. The use of textile sludge stabilization presents greater environmental benefits, given the malfunctions and problems that the incorrect waste disposal can cause to the environment.
基金supported by the Innovation Capability Support Program of Shaanxi(No.2022TD-07).
文摘To improve the mechanical properties and durability of the cement-stabilized base,rubber particles of three different sizes and with three different contents were optimally selected,the evolution laws of the mechanical strength and toughness of rubber-particle cement-stabilized gravel(RCSG)under different schemes were determined,and the optimal particle size and content of rubber particles were obtained.On this basis,the durability of the RCSG base was clarified.The results show that with an increase in the rubber particle size and content,the mechanical strength of RCSG gradually decreased,whereas the toughness and transverse deformation ability gradually increased.1%content and 2–4 mm sized RCSG can better balance the relationship between mechanical strength and toughness.The 7 d unconfined compressive strength was 17.7%higher than that of the 4–8 mm RCSG.The 28 d toughness index and ultimate splitting strain can be increased by 9.8%and 6.3 times,respectively,compared with ordinary cement-stabilized gravel(CSG).In terms of durability,compared with CSG,RCSG showed a 3.7%increase in the water stability property of cement-stabilized base with 1%content and 2–4 mm rubber particles,5.5%increase in the frozen coefficient,and 80.6%and 37.9%increase in the fatigue life at 0.70 and 0.85 stress ratio levels,respectively.
基金the Hunan Department of Transportation(No.202152)in ChinaNatural Science Foundation of Heilongjiang Province of China(JJ2020ZD0015)+1 种基金the Opening Project Fund of Materials Service Safety Assessment Facilities(MSAF-2021-005,MSAF-2021-109)German Research Foundation(DFG)under Grant No.SFB/TRR 339(453596084)。
文摘The road is one of the most important civil infrastructures for serving society,where its service quality and life have direct impacts on the safety and comfort of users.Therefore,road construction,condition detection and monitoring,and timely maintenance are particularly important for engineers.Many engineering applications of industrial informatics approaches,like image processing technology,widely used computer-based algorithms,and advanced sensors,have been initially and gradually applied to roads.This state-of-the-art review first summarized the research on industrial applications of advanced information technologies in recent years,while analyzing and comparing the advantages and disadvantages of each technology.Especially,five topics were focused on road construction,road maintenance with decision strategy,road structure evaluation,smart sensing in the road,and cooperative vehicle infrastructure system.It is expected that advanced industrial informatics can help engineers promote the development of smart,safe,and sustainable roads.
