煤矸石混凝土抗冻性能试验研究

发布时间：2018-03-18 03:21

本文选题：轻骨料混凝土　切入点：煤矸石　出处：《混凝土》2017年03期 　论文类型：期刊论文

【摘要】：用煤矸石陶粒、陶砂以不同比例取代普通混凝土粗、细骨料配制了轻骨料混凝土,通过正交试验及极差分析法,研究了煤矸石陶砂、陶粒掺量的不同对轻骨料混凝土的抗冻性能的影响,得出了不同取代率下的最优配合比。研究结果表明,陶砂对混凝土性能影响最为显著,随着陶砂掺量的增加,轻骨料混凝土抗冻性能"先提高,后降低,再提高",陶粒掺量在0~60%阶段抗冻性能逐渐降低,在60%~90%掺量阶段抗冻性呈现提高的趋势,30%掺量以内的粉煤灰对混凝土抗冻性影响最小,并随着粉煤掺量的增加轻骨料混凝土抗冻性能有所增加。各因素影响煤矸石混凝土抗冻性能的大小程度依次为:煤矸石陶砂影响大于陶粒影响,粉煤灰影响最小。100次冻融循环后抗冻性能较好的为第6组即A2B2C4(陶粒30%,陶砂30%,粉煤灰30%)、第9组A3B1C3(陶粒不掺,陶砂60%,粉煤灰20%)。
[Abstract]:With coal gangue, ceramic sand in different proportions to replace the ordinary concrete coarse, fine aggregate of lightweight aggregate concrete, through the orthogonal test and range analysis method, studied the coal gangue ceramic sand, influence of frost resistance of ceramsite content of lightweight aggregate concrete, the mixture ratio. The optimal substitution rate under different the research results show that the effect of ceramic sand on concrete performance are the most significant, with the increase of ceramic sand content, the frost resistance of lightweight aggregate concrete increased first and then decreased, and then increased, the ceramsite content gradually decreased in the frost resistance of 0~60%, increased the content of 60%~90% in the stage of frost resistance, less than 30% fly ash has minimal effect on the frost resistance of concrete with fly ash content, and increase the frost resistance of lightweight aggregate concrete is increased. The degree of influence factors of frost resistance of coal gangue concrete according to the times: Coal Gangue The influence of sand is greater than that of ceramsite, and the influence of fly ash is the least. After sixth times of freeze-thaw cycles, the frost resistance is better. The best is the A2B2C4 group, namely,.100 (ceramsite 30%, pottery sand 30%, fly ash 30%), and ninth sets of A3B1C3 (ceramsite not mixed, pottery sand 60%, fly ash 20%).

【作者单位】：西安建筑科技大学;东北大学;
【基金】：十二五国家科技支撑计划(2012BAJ17B01) 国家基金面上项目(51578447)
【分类号】：TU528

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