煤矸石混凝土水分传输及分布预测

为了研究煤矸石作为粗骨料对混凝土耐久性的影响,参照ASTM C1585-13推荐的方法,通过试验对煤矸石粗骨料混凝土的吸水性进行了研究,其中煤矸石替代传统粗骨料的质量比分别为0%,30%,60%,100%.分析了煤矸石掺量对混凝土吸水性能的影响,对比了各组试件的初始吸水率和第二阶段吸水率.结果表明:煤矸石混凝土的吸水率呈现两阶段特征.煤矸石粗骨料的掺量对混凝土的吸水性有显著的影响,当煤矸石替代30%的传统粗骨料时,试件的初始吸水率和第二阶段吸水率与未掺煤矸石试件的初始吸水率和第二阶段吸水率相差不大,但是当煤矸石的替代量大于60%时,试件的初始吸水率和第二阶段吸水率会明显增大,说明煤矸石掺量影响混凝土的耐久性.最后根据吸水试验的结果,结合非饱和毛细吸水的相关理论,对煤矸石混凝土内水分分布进行了预测.

Prediction of Water Transport and Distribution of the Gaugue Concrete

In order to evaluate the influence of coal gangue aggregates on the durability of concrete, the water absorption test was conducted on the gangue concrete specimens according to the ASTM C 1585-13. The replacement rate of the traditional aggregates by the coal gangue aggregates was 0%,30%,60%and 100%.The effects of the dosage of the coal gangue aggregates on the water absorption were analyzed;the initial rate of absorption and the second rate of absorption were compared.The results show that the water absorption capacity of the concrete is remarkably influenced by the contents of the coal gangue aggregates,when the replacement rate is 30%, the water absorption capacity of the specimen is similar to the traditional coarse concrete, however, when the replacement rate is larger than 60%, the water absorption capacity of the specimen went up obviously.It reveals that the dosage of the coal gangue aggregates affected the durability of the concrete.At last,the prediction of the water content distribution of the gangue concrete is illustrated according to the water absorption results.