水玻璃强化砂岩集料沥青混合料动态模量研究

Study on Dynamic Modulus of Asphalt Mixtures with Sodium Silicate Reinforced Sandstone Aggregate

摘要: 四川分布的大量砂岩吸水率偏高，力学性能较差，岩石轧制而成的集料其物理力学性能不满足设计规范中沥青路面所用集料的要求。基于此，研究对集料的物理力学性能进行改善，以便于可以应用于沥青路面中。本文选择水玻璃作为强化剂，通过旋转压实仪旋转压实成型试件，采用SPT测试系统测试试件的动态模量、相位角，通过sigmoidal函数拟合出动态模量与加载频率变化的主曲线用于对比。研究表明在较宽范围加载频率下，水玻璃处理过的沥青混合料的动态模量有很大的提高，永久变形降低、抗车辙能力提高、通过水玻璃处理过的集料吸水率降低、力学性能得到了提高，磨耗值降低，达到路面使用要求。

Abstract: Sichuan distribution of a large number of sandstone water absorption rate is high, poor mechanical properties, rock rolled from the aggregate of its physical and mechanical properties do not meet the design specifications of asphalt pavement used in the aggregate requirements. Based on this, research on the physical and mechanical properties of aggregates to improve, so that can be applied to asphalt pavement. In this paper, sodium silicate is chosen as the reinforcing agent, and the specimens are rotationally compacted by rotary compactor, and the dynamic modulus and phase angle of the specimens are tested by SPT test system, and the main curve of the dynamic modulus and the change of the loading frequency is fitted by the sigmoidal function for comparison. The study shows that in a wide range of loading frequency, the dynamic modulus of sodium silicate treated asphalt mixture has a great improvement, the permanent deformation is reduced, the rutting resistance is improved, the water absorption rate of sodium silicate treated aggregates is reduced, the mechanical properties are improved, the abrasion value is reduced, and the requirements of pavement use are met.