煤矸石掺再生骨料制备C30混凝土的试验研究
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摘要
用煤矸石和建筑垃圾作为粗骨料按不同比例掺和后代替混凝土中部分碎石粗骨料,通过控制不同掺量配制混凝土试件,在相同湿度,不同温度的环境下养护,并通过3因素3水平的正交试验确定最佳配合比。测得7d、28d混凝土抗压强度,通过对强度进行极差和方差分析,探索各因素对制备混凝土抗压强度的影响。结果表明,每立方米混凝土中掺入20%的煤矸石粗骨料、20%的建筑垃圾再生粗骨料代替部分碎石粗骨料,且在20℃环境中养护,为最佳方案。为了进一步验证该配合比制备的混凝土满足耐久性要求,选取3组试件进行抗硫酸盐侵蚀对比试验,结果表明,制备混凝土试件抗压耐蚀系数大于规范规定的75%,满足要求。
Coal gangue particles and recycled aggregate were used in different proportion mixture instead of gravel coarse aggregate in concrete,by controlling the amount of admixture to make different concrete specimens and take it under the same humidity, different ambient temperature curing, and through the orthogonal test of three factors and three levels to determine the best mix ratio. The measured compressive strength of 7 d, 28 d concrete, through the range and variance analysis of intensity, to explore the influence of various factors on the compressive strength of concrete. The results show that coal gangue particles doped with 20% and recycled construction waste with 20% replace part of the gravel with coarse aggregate in per cubic metre of concrete, and maintenance at 20 DEG C, as the best scheme. In order to further verify the mix ratio of the prepared concrete meets the requirement of durability. Three groups of specimens are selected to conduct a comparative test of sulfate resistance. The results show that the compressive corrosion resistance coefficient of concrete specimens is greater than 75% of the specifications, and meets the requirements.
Coal gangue particles and recycled aggregate were used in different proportion mixture instead of gravel coarse aggregate in concrete,by controlling the amount of admixture to make different concrete specimens and take it under the same humidity, different ambient temperature curing, and through the orthogonal test of three factors and three levels to determine the best mix ratio. The measured compressive strength of 7 d, 28 d concrete, through the range and variance analysis of intensity, to explore the influence of various factors on the compressive strength of concrete. The results show that coal gangue particles doped with 20% and recycled construction waste with 20% replace part of the gravel with coarse aggregate in per cubic metre of concrete, and maintenance at 20 DEG C, as the best scheme. In order to further verify the mix ratio of the prepared concrete meets the requirement of durability. Three groups of specimens are selected to conduct a comparative test of sulfate resistance. The results show that the compressive corrosion resistance coefficient of concrete specimens is greater than 75% of the specifications, and meets the requirements.
引文
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[3]郝亮,谭小蓉.煤矸石混凝土力学性能试验研究[J].中国煤炭,2016(11):116-121.
[4]丁威,冷发光,韦庆东,等.《普通混凝土配合比设计规程》(JGJ55-2011)简介[J].混凝土世界,2011(12):76-79.
[5]习晓红.养护温度对混凝土抗压强度的影响[J].资源环境与工程,2016(5):753-756.
[6]张怀平.养护温度对混凝土抗压强度影响的实际研究[J].山西建筑,2014(7):124-126.
[7]李永靖,邢洋.煤矸石混凝土抗硫酸盐侵蚀试验研究[J].非金属矿,2016(1):8-10.