细集料沥青混合料试件湿度养生方法研究

Moisture damage is one of the major premature distresses in China's asphalt pavements. Currently, considerable efforts have been made by domestic and international researchers to investigate the influence of liquid water on water damage, and the water stability evaluation system of asphalt pavements is also developed on the basis of liquid water. However, little attention has been paid to water vapor movemens in asphalt mixtures, which could also introduce damage into asphalt mixtures. This study proposes a newly developed method of moisture conditioning, which utilizes different moisture conditioning reagents to perform moisture conditioning for fine aggregate mixture (FAM) specimens in vacuum dessicators. Each vacuum dessicator is equipped with a temperature and humidity recordor to detect the relative humidity inside it. The measurement result of each recordor indicates that all the moisture conditioning reagents can regulate the relative humidity well. A high precision balance is employed to measure the mass changes of each specimen. The mass changes match well with the expected tendency, which validates the feasibility of the proposed conditioning method. Moisture conditioning for FAM specimens lays a foundation for the study on their fatigue properties at different relative humidity levels by Dynamic Mechanical Analyzer (DMA).