自燃煤矸石粗集料混凝土吸水性试验研究

发布时间：2018-02-04 23:31

本文关键词： 荷载作用自燃煤矸石混凝土吸水性　出处：《非金属矿》2017年04期 　论文类型：期刊论文

【摘要】：自燃煤矸石粗集料的多孔性使其吸水量比天然碎石大,当自燃煤矸石部分替代传统粗集料时会对混凝土耐久性产生影响。本试验通过对自燃煤矸石替代30%粗集料的煤矸石混凝土试件在持续压荷载作用下的吸水性进行试验研究,分析了不同荷载水平对煤矸石混凝土吸水性的影响,并与普通混凝土进行了对比试验。研究结果表明:荷载水平对混凝土和煤矸石混凝土的吸水性会产生显著的影响,当荷载水平较小时,试件的吸水能力会降低,当荷载水平较高时,试件的吸水能力会显著提高;煤矸石替代30%的粗集料不会对试件的吸水性产生明显影响,反映出煤矸石掺量较低时对混凝土的耐久性影响较小。
[Abstract]:The porosity of the coarse aggregate of spontaneous combustion gangue makes it absorb more water than the natural crushed stone. When the spontaneous combustion gangue partially replaces the traditional coarse aggregate, the durability of the concrete will be affected. In this experiment, the absorbency of the coal gangue concrete specimen with spontaneous combustion gangue replacing 30% coarse aggregate under the continuous compression load is studied. The influence of different load levels on water absorption of coal gangue concrete is analyzed and compared with that of ordinary concrete. The results show that the load level has a significant effect on the water absorption of concrete and coal gangue concrete. When the load level is small, the water absorption capacity of the specimen will decrease, when the load level is higher, the water absorption capacity of the specimen will be significantly increased, and the coal gangue will not have a significant effect on the water absorption of the specimen when the coarse aggregate of 30% is replaced by the coal gangue. It reflects that the low content of coal gangue has little influence on the durability of concrete.
【作者单位】：辽宁工程技术大学土木与交通学院;辽宁工程技术大学建筑工程学院;
【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)
【分类号】：TU528
【正文快照】： 煤矸石是原煤生产中最主要的工业固体废弃物。但是煤矸石的利用一直受限,绝大部分堆积储存形成了煤矸石山。目前,已有学者对煤矸石部分替代粗集料用于混凝土中的可行性进行了大量的研究。比如煤矸石对混凝土工作性、抗压强度、劈拉强度和抗折强度等的影响[1-2]。水在基体空隙

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