ABSTRACT

Although sustainable infrastructure is indispensable, there is almost no reported research on an asphalt concrete (AC) and rubberized concrete (RC) composite pavement. Furthermore, each study incorporating rubber mostly deployed one or two supplementary materials. Therefore, the performance of sustainable AC/RC pavements with various supplementary materials including zeolite, slag, fly ash, and steel fiber was comprehensively investigated in this study. 126 cylinders (150×300 mm) and 84 beams (150×150×530 mm) under 4-point bending were tested. Based on the results, AC/RC pavement indicated much higher compressive strength, flexural strength, stiffness, and energy absorption capacity than AC one. Although 25% of coarse aggregate was replaced with rubber, when 30% of cement was replaced with zeolite, fly ash, and slag (each 10%) and steel fibers (1% of the beam volume) were added, 83.7% of the flexural strength of AC/plain concrete (PC) beams was retained. With 25% replacement of coarse aggregate by rubber and use of zeolite and slag (each 15%), 87.4% of the compressive strength of AC/PC was retained. 25% rubber and 30% slag were found to be the optimum design for AC/RC pavement. Moreover, results from the proposed equations for predicting flexural and compressive strengths were in good agreement with the test ones.

摘要

尽管可持续基础设施是必不可少的，但几乎没有关于沥青混凝土 (AC) 和橡胶混凝土 (RC) 复合路面的研究报道。此外，每项包含橡胶的研究大多使用一种或两种补充材料。因此，本研究全面研究了采用各种辅助材料（包括沸石、矿渣、粉煤灰和钢纤维）的可持续 AC/RC 路面的性能。对126个圆柱体（150×300 mm）和84根梁（150×150×530 mm）进行了四点弯曲试验。根据结果​​，AC/RC 路面的抗压强度、抗弯强度、刚度和能量吸收能力比 AC 路面高得多。虽然 25% 的粗骨料用橡胶代替，但当 30% 的水泥用沸石、粉煤灰代替时，添加矿渣（各 10%）和钢纤维（梁体积的 1%）后，AC/普通混凝土 (PC) 梁的抗弯强度保留了 83.7%。用橡胶替代 25% 的粗骨料并使用沸石和矿渣（各 15%），AC/PC 的抗压强度保留了 87.4%。发现 25% 橡胶和 30% 矿渣是 AC/RC 路面的最佳设计。此外，所提出的用于预测抗弯和抗压强度的方程的结果与测试结果非常吻合。