摘要
依托于滇中引水工程,针对长距离运输混凝土坍落度损失快,匀质性降低的问题,研究了掺保坍剂和增稠剂对混凝土工作性、力学性能和变形性能的影响。结果表明:与D3K0基准组相比,掺入0.04%的LD-K保坍剂后,混凝土的初始坍落度及1 h坍落度增加,28 d力学性能降低不明显,28 d干缩降低了90×10^(-6);0.04%的LD-K保坍剂与0.03%的ME100M增稠剂或0.10%的VM1004增稠剂复掺,混凝土的保坍性能良好,抗离析性能提高,且28 d力学性能并未明显下降,干缩与DBL4组差异不大。
Based on the Dianzhong water diversion project,for the problem of fast slump loss and poor compatibility of concrete transported over long distances,the effects of adding slump retainers and thickeners on the workability,mechanical properties,and deformation performance of concrete were studied.The results show that compared with the D3K0 group,the addition of 0.04%LD-K slump retainer increases the initial slump and 1 h slump of the concrete,and the 28 d mechanical properties do not decrease significantly,and the 28 d dry shrinkage rate decreases by 90×10^(-6).The combination of 0.04%LD-K slump retainer and 0.03%ME100M thickener or 0.10%VM1004 thickener results in good slump retention and improves anti-segregation property of concrete,and the 28 d mechanical properties do not significantly decrease,and the drying shrinkage rate is not significantly different from that of DBL4 group.
作者
白锐
杨连云
夏求林
吕兴栋
周世华
王媛怡
蒋文广
王世美
BAI Rui;YANG Lianyun;XIA Qiulin;LYU Xingdong;ZHOU Shihua;WANG Yuanyi;JIANG Wenguang;WANG Shimei(Yunnan Dianzhong Water Diversion Engineering Co.,Ltd.,Kunming 650051,China;Yunnan Dianzhong Water Diversion PhaseⅡEngineering Co.,Ltd.,Kunming 650205,China;Changjiang River Scientific Research Institute of Changjiang Water Resources Commission,Wuhan 430010,China;National Dam Safety Research Center,Wuhan 430010,China)
出处
《混凝土与水泥制品》
2025年第7期30-34,47,共6页
China Concrete and Cement Products
基金
国家自然科学基金青年基金项目(52109147)
云南省重大科技专项计划项目(202102AF080001)
云南省重大科技专项计划项目(202002AF080003)
国家自然基金重点项目(U2340229)
长江科学院中央级公益性科研院所基金项目(CKSF20241002/CL)。
关键词
混凝土
坍落度
抗离析性能
保坍剂
增稠剂
工作性
Concrete
Slump
Anti-segregation property
Slump retainer
Thickener
Workability
