摘要
为研究煤矸石粗骨料对混凝土耐久性的影响,通过吸水试验研究了煤矸石替代传统粗骨料对混凝土毛细吸水特性的影响,其中煤矸石替代量分别为30%的粗骨料、60%的粗骨料和100%粗骨料.作为对比试验,同时测量传统骨料混凝土试件的吸水性.分析了载荷等级和煤矸石替代量对混凝土累积吸水高度、初始吸水率和第二阶段吸水率的影响.根据试验结果,利用水分传输理论中指数函数形式的扩散系数对煤矸石混凝土中水分分布进行预测.结果表明:煤矸石替代量对混凝土毛细吸水性的影响存在阈值,与传统粗骨料混凝土试件相比,当煤矸石替代量为30%时,试件的累积吸水高度没有显著变化,但是当煤矸石替代量为60%时,试件的累积吸水高度会显著增大,影响混凝土的耐久性,应力水平对混凝土的吸水性亦存在阈值,试件的吸水性随应力水平的增加呈先减小后增大的变化规律.
In order to investigate the effect of coal gangue aggregates on the durability of concrete, the water absorption of the gangue concrete specimens were conducted under sustained compressive load and the specimens with traditional aggregates were also studied as reference. The replacement ratio of the coal gauge aggregates was 30%, 60% and 100% by weight. The influence of the load level and the dosage of the coal gangue aggregates on the water transport properties(cumulative water absorption, initial rate of absorption and second rate of absorption) of the concrete were analyzed. At last, the water content distribution of the concrete was predicted according to the theory of the capillary theory. The results showed that the water transport property of the concrete specimens was remarkably influenced by the coal gauge aggregates, and there existed a threshold dosage, The slag concrete with30% coal gangue aggregates had little effect on the water transport property of the concrete, while when the gauge aggregates was larger than 60%, the water transport property of the specimen increased obviously. The load level also demonstrated a threshold value;when the load level was lower than 0.3, the water absorption transport property of the specimen decreased slightly, while when the load level was up to 0.6, the water transport property of the specimen gone up obviously.
作者
刘世
刘海卿
LIU Shi;LIU Haiqing(College of Civil Engineering, Liaoning Technical University, Fuxin 123000, China)
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2018年第5期804-808,共5页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金(U1261122)
辽宁省科学事业公益研究基金(2015004019)
关键词
煤矸石混凝土
载荷水平
毛细吸水
水分分布
耐久性
coal gangue concrete
load level
capillary water absorption
water content distribution
durability
