水分迁移对水泥基材料后续水化与微结构的影响

Influence of Moisture Migration on Further Hydration and Microstructure of Cement-Based Materials

摘要:

通过后续水化试验，研究了不同养护制度和水中水化温度下水泥基材料的水分迁移规律，分析了水分迁移对水泥基材料后续水化与微结构的影响.结果表明：水泥基材料结合水量随试件深度增加呈减小趋势，后续水化35 d时，试件深度160 mm处的结合水量较深度0 mm处降低6.4%；试件深度80 mm处的后续水化结合水量（前期）随高温水浴养护时间延长呈减小趋势，随水中水化温度升高而增大；当水中水化温度过高（60 ℃）时，水泥基材料内部生成微裂缝，孔结构粗化，后续水化表现为损伤作用.

Abstract:

A further hydration test was conducted to study the moisture migration laws of cement-based materials under different curing regimes and hydration temperatures of water. The influence of moisture migration on further hydration and microstructure of cement-based materials were analyzed. The results show that the amount of combined water in cement-based materials shows a tendency of decreasing with an increase in specimen depth. After further hydration for 35 d， the amount of combined water at the specimen depth of 160 mm is decreased by 6.4% compared with that at the depth of 0 mm. The amount of combined water for further hydration at the specimen depth of 80 mm during the early period displays a tendency of decreasing with an increase in high-temperature water-bath curing time， but its value increases with an increase in hydration temperature of water. When the hydration temperature of water is too high（60 ℃）， microcracks are generated inside cement-based materials， and the pore structure is coarsened， and further hydration manifests as damage effect.