摘要
为探讨煤矸石作为骨料制备混凝土的可行性,采用煤矸石和碎石分别作为骨料制备混凝土试件进行干燥收缩性能和抗冻性能的对比分析。结果表明,煤矸石骨料混凝土的干燥收缩率比碎石混凝土大,主要由于煤矸石骨料吸水率较大;不同骨料混凝土的早期干燥收缩率都较大,当龄期超过120d后趋于稳定;在常用水灰比下,煤矸石骨料混凝土的抗冻性能指标满足要求,但煤矸石骨料混凝土的质量损失率较碎石混凝土有所增大,主要因为煤矸石骨料中的孔隙水产生较大冻胀应力。利用煤矸石制备混凝土可行。
Aiming at studying the feasibility that coal gangues are taken as aggregates to prepare concrete, experiments on the dry contractibility and frost resistance, which coal gangues and crushed stones were used as aggregates to prepare concrete specimens, had been conducted for comparative analysis. The results showed that the dry contractibility of coal gangue aggregates concrete was larger than crushed stones, moreover the drying shrinkage rates at an early stage in different aggregates concrete were large comparatively, which tended to remain stable when the age of aggregates concrete was more than 120 d. Under the common water cement ratio, the frost resistance of coal gangue aggregates concrete was capable of meeting requirements, but the mass loss rate of coal gangue aggregates concrete was larger than crushed stone concrete. It was mainly accused by much more frost-heave stress generated by pore water in coal gangue aggregates. The test results show that it is really feasible for coal gangues to be used to prepare concrete.
出处
《非金属矿》
CAS
CSCD
北大核心
2013年第3期43-45,共3页
Non-Metallic Mines
基金
国家自然科学基金(51008148
51274111)
中国煤炭工业协会资助项目(MTKJ2012-319)
关键词
煤矸石骨料
混凝土
干燥收缩性能
抗冻性能
coal gangue aggregates concrete dry contractibility frost resistance
