关键词: 路基工程, 水泥, 再生骨料, 碎石, 龄期, 抗拉性能, 回弹模量

Abstract: As the base of pavement, cement-stabilized aggregate base mixture is affected by temperature difference between day and night which brings about swell-shrink stress inside the material. Meanwhile, cement-stabilized aggregate base mixture, as the major load-bearing layer of pavement, is subjected to an external shear stress under non-uniform stress. Splitting-tensile performance is a crucial indicator. In this paper, splitting tensile test and splitting tensile rebound test were conducted on cement stabilized clastic rock and cement stabilized recycled aggregate respectively. Test results suggest that the strength and modulus of elasticity both increased power-exponentially with age. The splitting-tensile performance of cement stabilized recycled aggregate is slightly lower than that of cement stabilized clastic rock; properly increasing the amount of cement could fill the gap. In addition, a good linear relationship is found between the strength and the modulus of elasticity via numerical fitting.

Key words: subgrade engineering, cement, recycled aggregate, clastic rock, age, tensile performance, modulus of resilience