中文摘要：

CA砂浆中沥青的大量存在使得其力学性能具有较强的时间依赖性.首先研究了CA砂浆抗压强度在不同加载速率下的变化规律及沥青乳液与水泥的相对质量比、砂的细度模数与外掺料硅灰（SF）和橡胶粉（CR）对CA砂浆抗压强度时间依赖性的影响.结果表明：CA砂浆的抗压强度随加载速率的升高呈增加趋势,沥青的相对含量越低,增加趋势越明显;砂的细度模数越小,CA砂浆的抗压强度对加载速率的稳定性越好,但同时会导致CA砂浆的流动性损失过大.SF和CR对CA砂浆表现出的时间依赖性有不同程度的改善作用.同时提出了沥青在CA砂浆中的理想分布模型,对其力学性能的时间依赖性进行了解释.

英文摘要：

CA mortar is a viscoelastic material and is used in slab track as a stress absorbing layer. The mechanical property of CA mortar exhibited a strong time-dependence due to the pervasive presence of asphalt in its structure. The paper explored the variation in compressive strength of CA mortar under different loading rate, and also investigated the effect of ratio between asphalt emulsion and cement, the fineness modulus （FM） of sand, and the incorporation of silica fume （SF） and crumb rubber （CR） on the time related behavior of CA mortar. Results indicated that the compressive strength of CA mortar was increased with a higher loading rate, and the upward trend was mitigated when less asphalt was present. A decrease in FM of sand and the incorporation of SF and CR contributed to weakening the time dependence of compressive strength on the loading rate, but a smaller FM of sand would result in exorbitant loss of fluidity of CA mortar. A hypothesized model of asphalt distribution in CA mortar was put forward to shed some light on the mechanism of time dependence of its mechanical property.