Abstract
Temperature change is one of the critical issues causing shrinkage cracking in cement-treated bases. This study aimed to evaluate the effect of incorporating rubber aggregates into cement-stabilized aggregate on temperature fluctuation in semi-rigid pavements. To estimate temperature change, the thermal property test was firstly conducted on rubberized cement-stabilized aggregates, in which the aggregate component (0.425 mm to 9.5 mm) was replaced by rubber aggregates (3–6 mm) at varying volume percentages of 0%, 5%, 10%, and 20%. The experimental results showed that increasing rubber aggregate content reduced the thermal diffusivity, thermal conductivity, and specific heat capacity of the rubberized cement-stabilized base materials. A good correlation between the thermal properties and surface temperature was also observed. These obtained thermal properties were then used in numerical simulations using the ANSYS program. The modelling results demonstrated the potential of rubberized cement-stabilized aggregates in reducing both temperature and temperature fluctuation within semi-rigid pavement structures. Furthermore, despite the detrimental impacts of rubber aggregates on compressive and splitting tensile strengths and compressive resilient modulus, the rubberized cement-stabilized aggregates still met the requirements for pavement bases.
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