Characterising the resilient behaviour of pavement subgrade with construction and demolition waste under Freeze-Thaw cycles

JOURNAL OF CLEANER PRODUCTION

卷:300

Article

Zhang, Junhui¹  Zhang, Anshun¹  Huang, Chao¹  Yu, Huayang^1,2  Zhou, Chao³ 

[1] Changsha Univ Sci & Technol, Natl Engn Lab Highway Maintenance Technol, Changsha, Peoples R China

[2] South China Univ Technol, Sch Civil Engn & Transportat, Guangzhou, Peoples R China

[3] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China

关键词: Construction and demolition waste;    Freeze-thaw cycles;    Matric suction;    Dynamic resilient modulus;    Prediction model;   

DOI  :  10.1016/j.jclepro.2021.126702

来源: Elsevier

【 摘 要 】

Recycling construction and demolition (C&D) waste as fillers in pavement subgrade is a sustainable paving technology with environmental and economic merits. The performance of pavement subgrade with C&D waste depends on its dynamic resilient modulus. Meanwhile, freeze-thaw cycles are also an important issue for engineering in seasonal frozen regions. However, research on characteristics of the dynamic resilient modulus of C&D waste, especially the properties under freeze-thaw cycles, is limited. To this end, this study aims to reveal the variation law of the dynamic resilient modulus of C&D waste under repeated freeze-thaw cycles and establish a reasonable performance prediction model. This study conducts a series of laboratory tests after various freeze-thaw cycles. Results indicate that the soil-water characteristic curves of C&D waste with different compactness and number of freeze-thaw cycles can be well described by Van Genuchten?s model. Moreover, the dynamic resilient modulus en-hances with the increase of matric suction, compactness, deviator stress and minimum bulk stress and exhibits a stress-hardening characteristic. Freeze-thaw cycles attenuate the matric suction and dynamic resilient modulus of C&D waste. Besides, high moisture contents, low stress levels and more freeze-thaw cycles all aggravate the attenuation of the dynamic resilient modulus in certain extent, but the attenu-ation is not sensitive to the compactness. Finally, this study establishes a high-accuracy prediction model of the dynamic resilient modulus considering the effect of repeated freeze-thaw cycles. This study can supply useful information on the application of C&D waste in pavement subgrade in seasonal frozen regions. ? 2021 Elsevier Ltd. All rights reserved.

【 授权许可】

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