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 Rubberized cement-stabilized aggregates: Mechanical performance, thermal properties, and effect on temperature fluctuation in road pavements
Tác giả hoặc Nhóm tác giả: Phuong N. Pham*, Thao T. T. Tran, Phat Nguyen, Tuan A. Truong, Rafat Siddique, Yue Liu, Yan Zhuge
Nơi đăng: Transportation Geotechnics; Số: https://doi.org/10.1016/j.trgeo.2023.100982.;Từ->đến trang: 1-10;Năm: 2023
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
Temperature change is one of critical issues causing shrinkage cracking in cement-treated bases. This study aims to evaluate the effect of cement-stabilized aggregate incorporating rubber aggregates on temperature fluctuation in semi-rigid pavements. For temperature estimation, the thermal property test was firstly conducted on rubberized cement-stabilized aggregates, in which the aggregate component sized 0.425 mm to 9.5 mm were replaced by rubber aggregates (3-6 mm) at different volume percentages of 0%, 5%, 10%, and 20%, respectively. The experimental results showed that higher rubber aggregate content reduced the thermal conductivity, thermal diffusivity, and specific heat capacity of the rubberized cement-stabilized base materials. Also, a good correlation between the thermal properties and surface temperature was observed. The obtained thermal properties then served as inputs for numerical simulations using the ANSYS program, and modelling results exhibited a potential of rubberized cement-stabilized aggregates in reducing both temperature and temperature fluctuation within semi-rigid pavement structures. Besides, despite the detrimental effect of rubber aggregates on compressive and splitting tensile strength and compressive resilient modulus, the rubberized cement-stabilized aggregates still met the requirements for pavement bases
ABSTRACT
Temperature change is one of critical issues causing shrinkage cracking in cement-treated bases. This study aims to evaluate the effect of cement-stabilized aggregate incorporating rubber aggregates on temperature fluctuation in semi-rigid pavements. For temperature estimation, the thermal property test was firstly conducted on rubberized cement-stabilized aggregates, in which the aggregate component sized 0.425 mm to 9.5 mm were replaced by rubber aggregates (3-6 mm) at different volume percentages of 0%, 5%, 10%, and 20%, respectively. The experimental results showed that higher rubber aggregate content reduced the thermal conductivity, thermal diffusivity, and specific heat capacity of the rubberized cement-stabilized base materials. Also, a good correlation between the thermal properties and surface temperature was observed. The obtained thermal properties then served as inputs for numerical simulations using the ANSYS program, and modelling results exhibited a potential of rubberized cement-stabilized aggregates in reducing both temperature and temperature fluctuation within semi-rigid pavement structures. Besides, despite the detrimental effect of rubber aggregates on compressive and splitting tensile strength and compressive resilient modulus, the rubberized cement-stabilized aggregates still met the requirements for pavement bases
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