应力吸收层材料对沥青路面加铺结构层间抗剪性能的影响

Influence of Stress-Absorbing Layer Materials on Interlayer Shear Performance of Asphalt Pavement Overlay Structures

摘要: 为系统评估沥青路面加铺结构中不同应力吸收层的层间抗剪性能，对环氧改性乳化沥青、环氧改性乳化沥青复合玄武岩纤维布、环氧改性乳化沥青复合不锈钢钢丝网及高性能应力吸收贴四种材料，在20℃、40℃、60℃及水–热耦合工况下开展45˚斜剪试验，分析剪切强度与粘结能的变化规律。结果表明：温度升高显著降低各材料的抗剪性能。高性能应力吸收贴综合性能最优，20℃时剪切强度达469.53 kPa、粘结能8.76 J，60℃时残余强度仍达24.19 kPa；而掺入玄武岩纤维布或钢丝网因有效粘结面积减少与界面削弱，抗剪性能低于纯环氧改性乳化沥青组，水–热耦合条件下提前破坏。研究可为加铺工程应力吸收层的合理选材提供试验依据。

Abstract: To systematically evaluate the interlayer shear performance of different stress-absorbing layers in asphalt pavement overlay structures, 45˚ oblique shear tests were conducted on four materials: epoxy-modified emulsified asphalt (EMEA), EMEA combined with basalt fiber fabric, EMEA combined with stainless steel wire mesh, and a high-performance stress-absorbing membrane. The tests were performed at 20˚C, 40˚C, 60˚C, and under hydrothermal coupling conditions. The variations in shear strength and bonding energy were analyzed. The results indicate that elevated temperatures significantly degrade the shear performance of all materials. The high-performance stress-absorbing membrane exhibits the best overall performance, achieving a shear strength of 469.53 kPa and a bonding energy of 8.76 J at 20˚C, while retaining a residual strength of 24.19 kPa at 60˚C. In contrast, the incorporation of basalt fiber fabric or stainless steel wire mesh reduces the effective bonding area and introduces interfacial weakening, resulting in lower shear resistance than that of the pure EMEA group, with premature failure under hydrothermal coupling conditions. This study provides an experimental basis for the rational selection of stress-absorbing layers in overlay engineering.