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膨胀剂和混合料贮存期对预拌补偿收缩混凝土抗压性能影响试验分析

发表时间:2016-07-31  浏览量:1263  下载量:348
全部作者: 马芹永,刘杰
作者单位: 安徽理工大学矿山地下工程教育部工程研究中心;安徽理工大学土木建筑学院
摘 要: 针对地下工程混凝土配比不准确、拌料粉尘大、抗裂防渗性差等问题,提出预拌补偿收缩混凝土技术。制备4种含水率的干拌混合料,分别贮存3,7,10,15,20,30 d后,掺加5种不同掺量膨胀剂预拌补偿收缩混凝土试块,进行抗压强度试验。试验结果表明,预拌补偿收缩混凝土抗压强度随膨胀剂掺量的增加呈先提高后降低的变化趋势,膨胀剂掺量为6%时抗压性能较好;干拌混合料贮存期愈长,预拌补偿收缩混凝土抗压强度愈低,混凝土劣化加剧;对不同膨胀剂掺量混凝土抗压强度与混合料贮存期关系及抗压强度损失率分析可知,预拌补偿收缩混凝土优于普通混凝土,若抗压强度损失率控制在5%以内,砂子含水率为0.5%的混合料合理贮存期为15 d,砂子含水率为1.0%的混合料合理贮存期只有7 d.
关 键 词: 地下工程;混凝土;干拌混合料;膨胀剂;贮存期;含水率
Title: Effects of different expansive agent and storage period on compressive properties of ready-mixed shrinkage-compensating concrete
Author: MA Qinyong, LIU Jie
Organization: Research Center of Mine Underground Engineering, Ministry of Education, Anhui University of Science and Technology; School of Civil Engineering and Architecture, Anhui University of Science and Technology
Abstract: To deal with the concrete problems in underground engineering, such as inaccuracy mix proportion, large dust concentration, poor impermeability and anti-cracking performance, ready-mixed shrinkage-compensating concrete is proposed. The compressive strength tests of concrete specimens with five expansive agent dosages are conducted. Dry-mixed materials in four aggregate moisture contents have been stored for 3, 7, 10, 15, 20, 30 d before concrete specimen preparation. The results of compression test show that the compressive strength of ready-mixed shrinkage-compensating concrete first increases and then decreases with expansive agent dosage increasing. And excellent compressive strength presents at expansive agent dosage of 6%. Moreover, long storage period leads to low compressive strength of ready-mixed shrinkage-compensating concrete and great concrete deterioration. According to the relationship between compressive strength and storage period and the relationship between compressive strength loss rate and storage period, the mechanical properties of ready-mixed shrinkage-compensating concrete are better than ordinary concrete. If the compressive strength loss rate is within 5%, the reasonable storage period for dry-mixed materials with sand moisture content of 0.5% is 15 d, while the reasonable storage period with sand moisture content of 1.0% is only 7 d.
Key words: underground engineering; concrete; dry-mixed material; expansive agent; storage period; moisture content
发表期数: 2016年7月第14期
引用格式: 马芹永,刘杰. 膨胀剂和混合料贮存期对预拌补偿收缩混凝土抗压性能影响试验分析[J]. 中国科技论文在线精品论文,2016,9(14):1447-1453.
 
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