摘要
采用"水稳碎石层+抗裂封层+AC-20C沥青面层"的结构组合,设计了包含抗裂封层的复合棱柱体试件的斜剪试验,在30℃和50℃2种试验温度下研究其抗剪性能.在层间剪切强度基础上,又结合层间剪切模量、层间剪切功以及剪切韧性指数3个指标,对4种抗裂封层的抗剪性能进行综合评价.试验结果表明,层间剪切功是在评价封层抗剪切变形能力时适用性较强,而剪切韧性指数在抗剪能力区分度上表现较差,不宜作为抗剪能力评价指标.以抗剪强度和层间剪切功综合评价抗裂封层的抗剪性能,比较合适.在30℃试验条件下,洒布量为3.0kg/m2的橡胶沥青封层的抗剪能力最好,其抗剪强度、达到1.18 MPa,ISW高达8.77J,比土工格栅封层高出近3倍;在50℃高温条件下,乳化沥青封层的抗剪切变形能力较强.
Based on the asphalt pavement structure with cement stabilized aggregate layer,anti-crack seal coat and the AC-20 Casphalt surface,the composite prism specimens are designed and then the shearing performance of anti-crack seal coat are studied at temperature of 30℃and 50℃,respectively.Combining with the shear strength and the anti-deformability indicator of interface shear modulus,interface shear work and shear toughness index,a comprehensive evaluation method on the shearing resistance of anti-crack seal coat is proposed in this paper.The test results show that the interface shear work can be a better applicable index to evaluate the anti-deformability of seal coat,while the shear toughness index cannot clearly distinguish the anti-deformability between different seal coat.Therefore,it is not suitable to evaluate the anti-deformability.The shear strength and interface shear work are more appropriate to comprehensively evaluate the resistant ability of anti-crack seal coat.Under the 30 ℃test conditions,the shear strength of asphalt rubber stress-absorbing membrane interlayer with 3.0kg/m^2 asphalt dosage is the largest which can be up to 1.18 MPa.In addition,its shear work is 8.77 J,which is 1.5times that of the fiberglass-polyester mat seal coat and nearly 3times larger than that of the geogrid seal coat.Under the condition of 50（C,the anti-deformability of emulsified asphalt seal coat is better than that of others.
出处
《武汉理工大学学报（交通科学与工程版）》
2017年第1期1-5,共5页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
中国博士后科学基金(2013M541666)
江苏省博士后科研资助计划项目(1302138C)资助
关键词
道路工程
抗裂封层
抗剪强度
层间剪切功
层间剪切模量
剪切韧性指数
road engineering
anti-crack seal coat
shear strength
interface shear work
interface shear modulus
shear toughness index
