Reasonable treatment and utilization of waste residuals discharged during the production of ready-mixed concrete is an important problem in the cement industry.In this study,a composite admixture was prepared by using...Reasonable treatment and utilization of waste residuals discharged during the production of ready-mixed concrete is an important problem in the cement industry.In this study,a composite admixture was prepared by using ready-mixed concrete waste residuals,furnace slag,and water granulated slag.The grinding characteristics of such material were investigated.Moreover,the effect of such admixture on cement hydration and pore structure was analyzed by X-ray diffraction,thermogravimetric-differential scanning calorimetry,scanning electron microcopy and mercury intrusion porosimetry.As shown by the results:The grinding characteristics of the waste residuals can be improved significantly by mixing them with furnace slag and water granulated slag.Furthermore,the composite admixture does not change the composition of hydration products;rather it contributes to refine the pore structure of the matrix,thus improving the mechanical properties of these cement-based materials.展开更多
In the actual field of construction, a lot of materials often need to apply, among which concrete is a very important material. In the process of making concrete, sand and stone is one of the important components of c...In the actual field of construction, a lot of materials often need to apply, among which concrete is a very important material. In the process of making concrete, sand and stone is one of the important components of concrete. Therefore, the selection of appropriate sand and gravel materials can effectively improve the overall quality of construction engineering. With the development of The Times, the construction field has also been developed by the shareholder wind, and the market has also put forward higher requirements for the quality of construction materials, which further promotes the further development of new technology in the construction field. Among them, mechanism sand is used as a substitute for sand and stone materials, which is widely used in the field of construction in China, and good results have been achieved in the process of practical application. This paper mainly makes the detailed analysis of the application and performance of mechanism sand in ready-mixed concrete, in order to make important contributions to the stable development of China's construction industry.展开更多
With the rise of green construction from "basic national policy" to "national strategy", national and local governments have issued a series of measures and policy documents. The supervision and pr...With the rise of green construction from "basic national policy" to "national strategy", national and local governments have issued a series of measures and policy documents. The supervision and protection of the ecological environment is bound to be stricter, and the refined development of green buildings is unstoppable. Under the new pattern, ready - mixed mortar, as a necessary building material for green buildings, bring significant economic benefits and promotes the rapid development of mortar enterprises and goals, and promote Chinas green development to a new level.展开更多
Compliance inspection is essential to ensure the quality of the ready-mixed concrete(RMC)supply chain.However,the current RMC compliance inspection is a labor-intensive and time-consuming manual task and lacks efficie...Compliance inspection is essential to ensure the quality of the ready-mixed concrete(RMC)supply chain.However,the current RMC compliance inspection is a labor-intensive and time-consuming manual task and lacks efficiency and transparency.This paper proposes a blockchain-based platform to cope with these challenges.Besides,an auto-generation method of smart contract for RMC compliance inspection based on ontology is proposed to reduce the barrier to utilizing blockchain.The framework design and information interaction flow are then demonstrated in detail.Furthermore,the performance of the platform in actual projects is evaluated using a case study.The results indicate that the proposed platform can improve the efficiency,transparency,and traceability of the RMC compliance inspection and facilitate the further applications of blockchain in the construction sector.展开更多
This research study quantifies the PM<sub>10</sub> emission rates (g/s) from cement silos in 25 concrete batching facilities for both controlled and uncontrolled scenarios by applying the USEPA AP-42 guide...This research study quantifies the PM<sub>10</sub> emission rates (g/s) from cement silos in 25 concrete batching facilities for both controlled and uncontrolled scenarios by applying the USEPA AP-42 guidelines step-by-step approach. The study focuses on evaluating the potential environmental impact of cement dust fugitive emissions from 176 cement silos located in 25 concrete batching facilities in the M35 Mussafah industrial area of Abu Dhabi, UAE. Emission factors are crucial for quantifying the PM<sub>10</sub> emission rates (g/s) that support developing source-specific emission estimates for areawide inventories to identify major sources of pollution that provide screening sources for compliance monitoring and air dispersion modeling. This requires data to be collected involves information on production, raw material usage, energy consumption, and process-related details, this was obtained using various methods, including field visits, surveys, and interviews with facility representatives to calculate emission rates accurately. Statistical analysis was conducted on cement consumption and emission rates for controlled and uncontrolled sources of the targeted facilities. The data shows that the average cement consumption among the facilities is approximately 88,160 (MT/yr), with a wide range of variation depending on the facility size and production rate. The emission rates from controlled sources have an average of 4.752E<sup>-04</sup> (g/s), while the rates from uncontrolled sources average 0.6716 (g/s). The analysis shows a significant statistical relationship (p < 0.05) and perfect positive correlation (r = 1) between cement consumption and emission rates, indicating that as cement consumption increases, emission rates tend to increase as well. Furthermore, comparing the emission rates from controlled and uncontrolled scenarios. The data showed a significant difference between the two scenarios, highlighting the effectiveness of control measures in reducing PM<sub>10</sub> emissions. The study’s findings provide insights into the impact of cement silo emissions on air quality and the importance of implementing control measures in concrete batching facilities. The comparative analysis contributes to understanding emission sources and supports the development of pollution control strategies in the Ready-Mix industry.展开更多
基金supported by the project of China State Construction Engineering Corporation(CSCEC-2020-Z-39,Zhao,R.X.,https://www.cscec.com.cn/).
文摘Reasonable treatment and utilization of waste residuals discharged during the production of ready-mixed concrete is an important problem in the cement industry.In this study,a composite admixture was prepared by using ready-mixed concrete waste residuals,furnace slag,and water granulated slag.The grinding characteristics of such material were investigated.Moreover,the effect of such admixture on cement hydration and pore structure was analyzed by X-ray diffraction,thermogravimetric-differential scanning calorimetry,scanning electron microcopy and mercury intrusion porosimetry.As shown by the results:The grinding characteristics of the waste residuals can be improved significantly by mixing them with furnace slag and water granulated slag.Furthermore,the composite admixture does not change the composition of hydration products;rather it contributes to refine the pore structure of the matrix,thus improving the mechanical properties of these cement-based materials.
文摘In the actual field of construction, a lot of materials often need to apply, among which concrete is a very important material. In the process of making concrete, sand and stone is one of the important components of concrete. Therefore, the selection of appropriate sand and gravel materials can effectively improve the overall quality of construction engineering. With the development of The Times, the construction field has also been developed by the shareholder wind, and the market has also put forward higher requirements for the quality of construction materials, which further promotes the further development of new technology in the construction field. Among them, mechanism sand is used as a substitute for sand and stone materials, which is widely used in the field of construction in China, and good results have been achieved in the process of practical application. This paper mainly makes the detailed analysis of the application and performance of mechanism sand in ready-mixed concrete, in order to make important contributions to the stable development of China's construction industry.
文摘With the rise of green construction from "basic national policy" to "national strategy", national and local governments have issued a series of measures and policy documents. The supervision and protection of the ecological environment is bound to be stricter, and the refined development of green buildings is unstoppable. Under the new pattern, ready - mixed mortar, as a necessary building material for green buildings, bring significant economic benefits and promotes the rapid development of mortar enterprises and goals, and promote Chinas green development to a new level.
文摘Compliance inspection is essential to ensure the quality of the ready-mixed concrete(RMC)supply chain.However,the current RMC compliance inspection is a labor-intensive and time-consuming manual task and lacks efficiency and transparency.This paper proposes a blockchain-based platform to cope with these challenges.Besides,an auto-generation method of smart contract for RMC compliance inspection based on ontology is proposed to reduce the barrier to utilizing blockchain.The framework design and information interaction flow are then demonstrated in detail.Furthermore,the performance of the platform in actual projects is evaluated using a case study.The results indicate that the proposed platform can improve the efficiency,transparency,and traceability of the RMC compliance inspection and facilitate the further applications of blockchain in the construction sector.
文摘This research study quantifies the PM<sub>10</sub> emission rates (g/s) from cement silos in 25 concrete batching facilities for both controlled and uncontrolled scenarios by applying the USEPA AP-42 guidelines step-by-step approach. The study focuses on evaluating the potential environmental impact of cement dust fugitive emissions from 176 cement silos located in 25 concrete batching facilities in the M35 Mussafah industrial area of Abu Dhabi, UAE. Emission factors are crucial for quantifying the PM<sub>10</sub> emission rates (g/s) that support developing source-specific emission estimates for areawide inventories to identify major sources of pollution that provide screening sources for compliance monitoring and air dispersion modeling. This requires data to be collected involves information on production, raw material usage, energy consumption, and process-related details, this was obtained using various methods, including field visits, surveys, and interviews with facility representatives to calculate emission rates accurately. Statistical analysis was conducted on cement consumption and emission rates for controlled and uncontrolled sources of the targeted facilities. The data shows that the average cement consumption among the facilities is approximately 88,160 (MT/yr), with a wide range of variation depending on the facility size and production rate. The emission rates from controlled sources have an average of 4.752E<sup>-04</sup> (g/s), while the rates from uncontrolled sources average 0.6716 (g/s). The analysis shows a significant statistical relationship (p < 0.05) and perfect positive correlation (r = 1) between cement consumption and emission rates, indicating that as cement consumption increases, emission rates tend to increase as well. Furthermore, comparing the emission rates from controlled and uncontrolled scenarios. The data showed a significant difference between the two scenarios, highlighting the effectiveness of control measures in reducing PM<sub>10</sub> emissions. The study’s findings provide insights into the impact of cement silo emissions on air quality and the importance of implementing control measures in concrete batching facilities. The comparative analysis contributes to understanding emission sources and supports the development of pollution control strategies in the Ready-Mix industry.
