基于劈裂试验的沥青混合料拉压模量同步测试方法

发布时间：2018-09-01 19:53

【摘要】：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。
[Abstract]:In order to truly characterize the tensile and compressive deformation ability of asphalt mixture and to improve the testing efficiency and scientificalness of its tensile and compression modulus, the direct drawing, unconfined compression resistance of asphalt mixture and drawing based on splitting test were carried out. Compression resilience modulus test. According to Hooke's law under two dimensional stress state, by integrating horizontal radial and vertical radial strain functions of specimen center, an analytical algorithm of tensile modulus and compression modulus in splitting test is derived by using calculus principle. The quantitative relationships between the two moduli and load, specimen size, strain gauge length, tensile and compressive rebound strain and Poisson's ratio are revealed. The splitting compression modulus measured by splitting test method is close to that of uniaxial compression modulus, and the deviation is less than 2%. Due to the difference of stress state and stress level, there is a certain deviation between splitting tensile modulus and direct tensile modulus. But to the extent acceptable. The results show that the asphalt mixture has obvious difference in tension and compression. The synchronous testing method of tensile and compression modulus of asphalt mixture based on split test can improve the testing efficiency and scientificity of the tensile and compression modulus of asphalt mixture. It can provide scientific design parameters for asphalt pavement structure design.
【作者单位】：长沙理工大学公路养护技术国家工程实验室;
【基金】：国家自然科学基金项目(51578081,51208066) 交通运输部建设科技项目(2015318825120) 湖南省重点研发计划-工业领域技术创新项目(2016GK2096) 中国工程院咨询研究项目(2017-XY-17) 公路养护技术国家工程实验室开放基金项目(kfh160102) 河南省交通运输厅项目(2013k28) 湖南省研究生科研创新项目(CX2017B457)
【分类号】：U414

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