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为评价抗裂封层的抗剪切变形能力,设计了带沥青混合料面层且包含抗裂封层的复合棱柱体试件,采用ELE多极变速加载设备加载,以层间剪切模量、层间剪切功以及剪切韧性指数作为评价指标,在30℃和50℃两种试验温度下研究抗剪切变形能力。试验结果表明:层间剪切功是一个较好的评价封层抗剪切变形能力的适用指标,而剪切韧性指数不能明显区分不同封层的抗剪切变形能力,作为评价指标效果不佳。在30℃试验条件下,洒布量为3.0kg/m2的橡胶沥青封层的层间剪切功最大,达到8.77J,是聚酯玻纤布封层的1.5倍,比土工格栅封层高出将近3倍。在50℃高温条件下,聚酯玻纤布封层和橡胶沥青封层(2.4kg/m2)的抗剪切变形能力并不比乳化沥青封层强。
In order to evaluate the anti-cracking deformation resistance, a composite prismatic specimen with asphalt mixture surface and anti-cracking layer was designed and loaded by ELE multi-pole variable speed loading equipment. The interlaminar shear modulus , Interlaminar shear workability and shear toughness index were used as evaluation indexes to study the shear deformation resistance at 30 ℃ and 50 ℃. The experimental results show that the interlaminar shearing work is a good indicator to evaluate the shearing deformation resistance of the sealer, while the shearing ductility index can not clearly distinguish the anti-shearing deformation ability of different sealer, which is not good as the evaluation index . Under the test condition of 30 ℃, the rubber sheathed layer with the spreading amount of 3.0kg / m2 has the largest interlaminar shearing work of 8.77J, which is 1.5 times that of polyester fiberglass cloth sealing layer, Almost three times higher. At 50 ℃ high temperature, polyester fiberglass seal and rubber bitumen seal (2.4kg / m2) shear deformation capacity is not stronger than the emulsion bitumen seal.