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为了较真实地表征沥青混合料的抗拉、抗压变形能力,提高其拉、压模量的测试效率与科学性,开展了沥青混合料直接拉伸、无侧限抗压以及基于劈裂试验的拉、压回弹模量试验。根据二维应力状态下的胡克定律,利用微积分原理,通过对试样中心水平径向和竖直径向应变函数进行积分,推导出劈裂试验中拉伸模量和压缩模量的解析算法,揭示了2种模量与荷载大小、试样尺寸、应变片长度、测试得到的拉压回弹应变和泊松比的定量关系。按劈裂试验方法同步测得的劈裂压缩模量与单轴压缩模量比较接近,偏差在2%之内;由于应力状态和应力水平的差别,劈裂拉伸模量与直接拉伸模量存在一定偏差,但亦在可接受的范围内。研究结果表明:沥青混合料存在明显的拉、压差异性,基于劈裂试验的沥青混合料拉、压模量同步测试方法能够提高沥青混合料拉、压模量的测试效率与科学性,可为沥青路面结构设计提供科学的设计参数。
In order to more truly characterize the tensile and compressive deformation ability of asphalt mixture and improve the test efficiency and scientificity of its tensile and compression modulus, direct tensile compaction of asphalt mixture, unconfined compressive strength and splitting test Pull, compression modulus test. According to the Hooke’s law in two-dimensional stress state, the analytic algorithm of tensile modulus and compressive modulus in the splitting test is derived by integrating the horizontal radial and vertical radial strain functions of the sample center by using the principle of calculus The quantitative relationships between the two moduli and the load size, sample size, strain gauge length, tensile-compression resilience strain and Poisson’s ratio obtained were revealed. The splitting compressive modulus measured synchronously by the splitting test method is similar to that of the uniaxial compressive modulus with a deviation of within 2%. Due to the difference between the stress state and the stress level, the splitting tensile modulus and the direct tensile modulus There is a certain amount of deviation, but also within the acceptable range. The results show that there is obvious pull and pressure difference in asphalt mixture. The synchronous testing method of pull and compression modulus of asphalt mixture based on splitting test can improve the test efficiency and scientificalness of pull and compression modulus of asphalt mixture. Asphalt pavement structure design to provide scientific design parameters.