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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。
In order to further understand the meso-structure of asphalt mixture, the influence of aggregate size on the mechanical properties of asphalt mortar was studied by traditional mechanics test based on mortar theory. The influence rules and causes of particle size effect were analyzed according to the results of mesoscopic model calculation. The results show that the asphalt mortar has higher viscosity and lower strength, and it is hard to show obvious damage during the test. Only the mortar specimen with the maximum nominal diameter of 2.36 mm can undergo uniaxial compression failure, and under 1.18 mm Particle size of the mortar specimen has no obvious splitting failure, and in the direct tensile test the particle size of less than 0.6 mm of the specimen were not broken off; aggregate size of the asphalt mortar compressive and tensile properties were significantly affected , The mechanical properties of asphalt mortar decrease with the decrease of the maximum nominal particle size, and the strength of asphalt mortar is close to that of asphalt mortar when the particle size is less than 0.15 mm. From the meso-mechanics calculation, the particle size of asphalt mortar The largest part of the aggregates plays a major role in the overall resilience modulus, and further verifies that the aggregate size has a significant effect on the mechanical properties.