With the rapid development of urban construction, urban old road reconstruction workload is large. Compared with the previous milling and paving maintenance method, the application of foam asphalt cold regeneration ba...With the rapid development of urban construction, urban old road reconstruction workload is large. Compared with the previous milling and paving maintenance method, the application of foam asphalt cold regeneration base construction technology, as a flexible structure, has strong fatigue resistance and can greatly reduce the generation of reflection cracks. At the same time, energy saving and environmental protection, small social impact, lane construction does not interrupt traffic, paving, rolling can be immediately open to traffic, economic and efficient advantages, so that the technology in the urban road reconstruction application prospects are very considerable.展开更多
The structural design of asphalt foaming device, the determination of foam chamber process and condition parameters are the key technologies to foaming effect of foam asphalt. In this paper, we analyze the research st...The structural design of asphalt foaming device, the determination of foam chamber process and condition parameters are the key technologies to foaming effect of foam asphalt. In this paper, we analyze the research status of foaming mechanism, foaming device design and determination of the various parameters. The paper puts forward opinions for asphalt foaming technology. And development trend of the asphalt foaming technology is analyzed.展开更多
By indirect tensile strength （ITS） test and unconfined compressive strength （UCS） test, the influence of various material related parameters, including asphalt foamability, aggregate temperature, mixing moisture c...By indirect tensile strength （ITS） test and unconfined compressive strength （UCS） test, the influence of various material related parameters, including asphalt foamability, aggregate temperature, mixing moisture content （MMC） and foamed asphalt （FA） content, on the mechanical properties of FA mixes was studied. The results indicated that both asphalt foamability and aggregate temperature greatly affected ITS of FA mixes. Too low aggregate temperature was unfavorable for mechanical properties of FA mixes. Foamed index alone was unfit for the evaluation of asphalt foamability. Compared with half-life, expansion ratio had more prominent influence on ITS of FA mixes. MMC had significant impact on the mechanical properties of FA mixes and should be optimized by trial and test in FA mix design. The mechanical properties of FA mix were sensitive to the change of FA content. Compared with the ITS determined with standard Marshall specimens, both the ITS and UCS determined with static compressed specimens by 15 cm diameter were more effective in terms of choosing the optimal asphalt content for FA mixes.展开更多
To comprehensively assess the current state-of-art in asphalt foaming technology, the following four key aspectshave been reviewed systematically: foaming principles, test methods, evaluation indicators, and influenci...To comprehensively assess the current state-of-art in asphalt foaming technology, the following four key aspectshave been reviewed systematically: foaming principles, test methods, evaluation indicators, and influencing factors.Key findings reveal that asphalt foaming was primarily driven by the vaporization of water, with deteriorationprocesses including bubble collapse and liquid film drainage. However, the current understanding of asphaltfoaming principles remains limited, primarily due to difficulties in capturing and precisely measuring its microscopic behaviors during asphalt foaming process. Volume changes provided an intuitive means to evaluate theexpansion capacity of asphalt and its foaming stability. Bubble evolution characteristics of foamed asphalt offeredpromising insights into its foaming performance. Traditional ruler and stopwatch-based assessments were beingsuperseded by automated techniques like laser and ultrasonic ranging. Nevertheless, the current measuringequipment still lacks the capability to comprehensively evaluate the foaming effect of asphalt across various dimensions. Asphalt temperature and foaming water consumption significantly affected asphalt foaming performance, and the inclusion of foaming agents typically led to a notable increase in the half life of foamed asphalt.However, the interaction between foaming agents and asphalt, as well as the underlying mechanisms affecting thefoaming effect, are still unclear and require further exploration. Future research should primarily focus on thecorrelation between asphalt foaming effect and mixture performance, aiming to guide the practical engineeringapplication of foamed asphalt mixtures and enlarge the advantages of such low-emission and sustainable mixtures.展开更多
随着市政道路服役年限增长,路面易出现龟裂、沉陷、车辙等结构性病害,传统维修方式存在旧料利用率低、施工周期长等问题。某市政道路改建工程全长2.1 km,原路面为“4 cm AC-13C+6 cm AC-16C+14 cm二灰碎石基层+30 cm石灰土底基层”结构...随着市政道路服役年限增长,路面易出现龟裂、沉陷、车辙等结构性病害,传统维修方式存在旧料利用率低、施工周期长等问题。某市政道路改建工程全长2.1 km,原路面为“4 cm AC-13C+6 cm AC-16C+14 cm二灰碎石基层+30 cm石灰土底基层”结构,因长期承载出现纵横向裂缝及交叉口车辙变形,亟需通过再生技术恢复路用性能。泡沫沥青冷再生工艺具有旧料就地利用、节能减排及施工效率高等优势,本研究以该工程为依托,通过优化铣刨参数、配合比设计及施工控制流程,将原路面铣刨料再生为8 cm冷再生基层,并加铺4 cm改性沥青混凝土面层,重点分析施工技术要点与实施效果,为同类工程提供实践依据。展开更多
文摘With the rapid development of urban construction, urban old road reconstruction workload is large. Compared with the previous milling and paving maintenance method, the application of foam asphalt cold regeneration base construction technology, as a flexible structure, has strong fatigue resistance and can greatly reduce the generation of reflection cracks. At the same time, energy saving and environmental protection, small social impact, lane construction does not interrupt traffic, paving, rolling can be immediately open to traffic, economic and efficient advantages, so that the technology in the urban road reconstruction application prospects are very considerable.
基金Foundation of Xi'an Science Plan(CX12180(4))the Special Fund for Basic Scientific Research of Central Colleges of Chang’an University(CHD2010JC092)
文摘The structural design of asphalt foaming device, the determination of foam chamber process and condition parameters are the key technologies to foaming effect of foam asphalt. In this paper, we analyze the research status of foaming mechanism, foaming device design and determination of the various parameters. The paper puts forward opinions for asphalt foaming technology. And development trend of the asphalt foaming technology is analyzed.
文摘By indirect tensile strength （ITS） test and unconfined compressive strength （UCS） test, the influence of various material related parameters, including asphalt foamability, aggregate temperature, mixing moisture content （MMC） and foamed asphalt （FA） content, on the mechanical properties of FA mixes was studied. The results indicated that both asphalt foamability and aggregate temperature greatly affected ITS of FA mixes. Too low aggregate temperature was unfavorable for mechanical properties of FA mixes. Foamed index alone was unfit for the evaluation of asphalt foamability. Compared with half-life, expansion ratio had more prominent influence on ITS of FA mixes. MMC had significant impact on the mechanical properties of FA mixes and should be optimized by trial and test in FA mix design. The mechanical properties of FA mix were sensitive to the change of FA content. Compared with the ITS determined with standard Marshall specimens, both the ITS and UCS determined with static compressed specimens by 15 cm diameter were more effective in terms of choosing the optimal asphalt content for FA mixes.
基金the National Natural Science Foundation of China(Grant No.52378452)Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX23_1193)+1 种基金Nanjing Transportation Science and Technology Project(JSZC-320100-HBGLC2023-0037)Nantong Highway Development Center Science and Technology Project(2022PMLQYJ)and 333 High-level Talent Project of Jiangsu Province(6th).
文摘To comprehensively assess the current state-of-art in asphalt foaming technology, the following four key aspectshave been reviewed systematically: foaming principles, test methods, evaluation indicators, and influencing factors.Key findings reveal that asphalt foaming was primarily driven by the vaporization of water, with deteriorationprocesses including bubble collapse and liquid film drainage. However, the current understanding of asphaltfoaming principles remains limited, primarily due to difficulties in capturing and precisely measuring its microscopic behaviors during asphalt foaming process. Volume changes provided an intuitive means to evaluate theexpansion capacity of asphalt and its foaming stability. Bubble evolution characteristics of foamed asphalt offeredpromising insights into its foaming performance. Traditional ruler and stopwatch-based assessments were beingsuperseded by automated techniques like laser and ultrasonic ranging. Nevertheless, the current measuringequipment still lacks the capability to comprehensively evaluate the foaming effect of asphalt across various dimensions. Asphalt temperature and foaming water consumption significantly affected asphalt foaming performance, and the inclusion of foaming agents typically led to a notable increase in the half life of foamed asphalt.However, the interaction between foaming agents and asphalt, as well as the underlying mechanisms affecting thefoaming effect, are still unclear and require further exploration. Future research should primarily focus on thecorrelation between asphalt foaming effect and mixture performance, aiming to guide the practical engineeringapplication of foamed asphalt mixtures and enlarge the advantages of such low-emission and sustainable mixtures.
文摘随着市政道路服役年限增长,路面易出现龟裂、沉陷、车辙等结构性病害,传统维修方式存在旧料利用率低、施工周期长等问题。某市政道路改建工程全长2.1 km,原路面为“4 cm AC-13C+6 cm AC-16C+14 cm二灰碎石基层+30 cm石灰土底基层”结构,因长期承载出现纵横向裂缝及交叉口车辙变形,亟需通过再生技术恢复路用性能。泡沫沥青冷再生工艺具有旧料就地利用、节能减排及施工效率高等优势,本研究以该工程为依托,通过优化铣刨参数、配合比设计及施工控制流程,将原路面铣刨料再生为8 cm冷再生基层,并加铺4 cm改性沥青混凝土面层,重点分析施工技术要点与实施效果,为同类工程提供实践依据。
