沥青砂浆力学性能的粒径效应试验研究

发布时间：2019-03-08 20:36

【摘要】：为了进一步理解沥青混合料细观结构,从胶浆理论出发,通过传统力学试验研究集料尺寸对沥青砂浆力学性能的影响,并根据细观模型计算结果对粒径效应影响规律和成因进行分析。结果表明:沥青砂浆的黏性较强而强度较低,在试验过程中很难出现明显的破坏现象,仅最大公称粒径为2.36 mm的砂浆试件能发生单轴压缩破坏,在1.18 mm以下粒径的砂浆试件已无明显劈裂破坏,而在直接拉伸试验中粒径小于0.6 mm的试件均未被拉断;集料尺寸对沥青砂浆的抗压和抗拉性能的影响显著,随着最大公称粒径的减小,沥青砂浆的力学性能减弱,而当粒径小于0.15 mm时沥青砂浆的强度已与沥青胶浆较为接近;从细观力学计算可知,沥青砂浆中粒径最大的那部分集料对其整体回弹模量起主要作用,且进一步验证了集料尺寸对其力学性能有显著影响。
[Abstract]:In order to further understand the meso-structure of asphalt mixture, the influence of aggregate size on mechanical properties of asphalt mortar was studied by traditional mechanical experiments based on the theory of mortar. According to the results of the mesoscopic model, the influence rules and causes of particle size effect are analyzed. The results show that the viscosity of asphalt mortar is stronger and the strength is lower, so it is difficult to appear obvious failure phenomenon in the test process. Only the mortar specimen with the maximum nominal particle size of 2.36 mm can cause uniaxial compression failure. The mortar specimens with diameter less than 1.18 mm have no obvious splitting failure, but those whose particle size is less than 0.6 mm have not been broken in direct tensile test. The influence of aggregate size on the compressive and tensile properties of asphalt mortar is significant. With the decrease of maximum nominal particle size, the mechanical properties of asphalt mortar weaken, but when the particle size is less than 0.15 mm, the strength of asphalt mortar is close to that of asphalt mortar. It can be seen from the meso-mechanical calculation that the aggregate with the largest particle size plays a major role in the overall elastic modulus of the asphalt mortar, and further verifies that the size of the aggregate has a significant effect on its mechanical properties.
【作者单位】：长沙理工大学交通运输工程学院;
【基金】：国家自然科学基金项目(50808026,51038002)
【分类号】：U414

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