粉煤灰混凝土力学性能试验研究
Test Study on Fly Ash Concrete Mechanical Properties
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摘要: 研究了不同粉煤灰用量、不同水灰比对混凝土抗压强度、劈拉强度及抗折强度的影响，并且分析了产生这些影响的机理。结果表明：采用粉煤灰替代部分水泥和骨料会使抗压强度、劈拉强度及抗折强度降低。在粉煤灰用量不超过20%时，28 d抗压强度下降幅度较小，粉煤灰用量超过20%时，28 d抗压强度下降幅度较大；劈拉强度和抗折强度在粉煤灰用量不超过20%时，28 d抗压强度下降幅度较大，粉煤灰用量超过20%时，28 d抗压强度下降幅度较小。28 d粉煤灰混凝土抗压强度、劈拉强度及抗折强度都会随着水灰比增加而降低。通过粉煤灰混凝土力学性能正交试验得出最大限度替代水泥同时，强度满足工程实际需求的混凝土，试验分析表明：粉煤灰用量在10%～20%最佳，且粉煤灰用量是影响混凝土强度最主要因素。Abstract: We study the influence of different content of fly ash and water-cement ratio on concrete compressive strength, splitting tensile strength and flexural strength, and analyze the mechanism of these effects. The results show that using fly ash to replace partial cement and aggregate can make the compressive strength, splitting tensile strength and flexural strength reduced. When fly ash content is less than 20%, the falling range of 28 d compressive strength is smaller; when fly ash content is more than 20%, the falling range of 28 d compressive strength is bigger; splitting tensile strength and flexural strength is no more than 20%, the falling range of fly ash 28 d compressive strength is larger; when the fly ash content is more than 20%, the falling range of 28 d compressive strength is smaller. Compressive strength, splitting tensile strength and flexural strength of 28 d fly ash concrete will reduce with the increase of water-cement ratio. By the experiment of fly ash concrete mechanical properties, it is concluded that replacing cement at the same time, the maximum strength meets the demand of engineering practice of concrete, and test analysis showed that the best dosage from 10% to 20% of fly ash is the main factor that affects the strength of concrete.
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Keywords:
- concrete /
- fly ash /
- water-cement ratio /
- mechanical property /
- orthogonal test
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[1] 舒朗,卢忠远,严云，等.利用粉煤灰级配提高混凝土力学性能[J].煤炭学报,2008,33(8):941-945. [2] 姚韦靖，庞建勇.超细粉煤灰与粉煤灰混凝土力学性能对比试验研究[J].混凝土与水泥制品,2015(12)：10-13. [3] 江见鲸.高等混凝土结构理论[M].北京:中国建筑工业出版,2007:14-15. [4] 赵晖,孙伟,高波,等.粉煤灰品质对混凝土性能研究[J].应用基础与工程科学学报,2012,20(3)：484. [5] 黄伟建,俞海勇.混烧高钙粉煤灰用于水泥和混凝土的试验研究[J].粉煤灰,2002(5):16-21. [6] 林庆昌.粉煤灰与矿粉在混凝土中的应用研究[J].福建建材,2004(4):15-16. [7] 于奎峰,韩玉海,姜福香,等.双掺高性能混凝土配合比试验研究[J].铁道建筑,2009(5):116-119. [8] 赵庆新,齐立剑,潘慧敏.基于混凝土碳化耐久性的粉煤灰临界掺量[J].建筑材料学报,2015,18(1)：118. [9] 于常清,王福来,龚爱民,等.水胶比对掺粉煤灰混凝土强度的试验研究[J].水利科技与经济,2013,19(4):91-94. [10] 张文博,毛明杰,杨秋宁,等.粉煤灰混凝土的单轴与劈裂抗拉强度研究[J].兰州理工大学学报,2015，41(6)：138-142.
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