基于力学性能试验的不同应力吸收层对比分析

Comparative Analysis of Different Stress Absorbing Layers Based on Mechanical Performance Tests

为了研究及评价不同应力吸收层的综合性能,为选择性能最优的应力吸收层提供理论依据,在分析比较国内外应力吸收层的基础上,选取5种典型的应力吸收层进行系统试验研究。研究对象包括橡胶沥青、改性乳化沥青、土工格栅、聚酯玻纤布及Strata应力吸收层,对它们分别进行拉拔试验、剪切试验、低温小梁弯曲试验及疲劳试验,通过拉拔强度、抗剪强度、断裂能及疲劳寿命等指标评价它们的黏结性能、抗剪性能、低温性能及疲劳性能。最后综合力学性能、施工工艺及成本等因素进行对比分析,结果表明:力学性能方面,Strata应力吸收层最优,乳化沥青下封层最差;施工工艺及造价方面,乳化沥青下封层最优,Strata应力吸收层最差;综合对比来看,橡胶沥青应力吸收层性价比最高。

In order to evaluate the performance of different stress absorbing layers and provide a theoretical basis for the selection of the stress absorbing layer with optimal performance, five typical stress absorbing lay- ers were selected to conduct comprehensive tests, including rubber asphalt, modified emulsified asphalt, geogrid, fiberglass-polyester paving mat and Strata. Comprehensive research content included pull-out test, shear test, bending test of small beam and fatigue test. The indexes of pull strength, shear strength, breaking energy and fatigue life were used to evaluate their bond properties, shear properties, low temperature perfor- mance and fatigue performance. Finally, the comprehensive performance of different stress absorbing layers were compared based on the mechanics performance, construction technology and cost. The results show that the mechanical properties of Strata stress absorbing layer is optimal, emulsified asphalt seal coat is the worst; the construction technology and cost of emulsified asphalt are optimal, Strata stress absorbing layer is the worst; the rubber asphalt stress absorbed layer has optimal cost-performance ratio compared with the others.