双源膨胀体系对混凝土收缩性能的影响研究  

Study on the Influence of Dual-Source Expansion System on the Shrinkage Performance of Concrete

作　　者：周月霞 方博 隋玉朋 赵娟 朱国军 ZHOU Yuexia;FANG Bo;SUI Yupeng;ZHAO Juan;ZHU Guojun(Wuhan Ujoin Building Material Technology Co.,Ltd.,Wuhan 430083,China;Wuhan Sanyuan Special Building Materials Co.,Ltd.,Wuhan 430083,China;China MCC22 Group Co.,Ltd.,Tangshan 063000,China)

机构地区：[1]武汉源锦建材科技有限公司,武汉430083 [2]武汉三源特种建材责任有限公司,武汉430083 [3]中国二十二冶集团有限公司,唐山063000

出　　处：《粉煤灰综合利用》2025年第2期25-32,共8页Fly Ash Comprehensive Utilization

摘　　要：为分析膨胀剂在不同环境的膨胀效果及适用工况,研究了钙源膨胀剂和镁源膨胀剂以及两者复合双源膨胀体系在不同养护温度、养护制度的混凝土限制膨胀率,并且测试了混凝土厚度300、800和1300 mm三种典型工况条件的温度历程,研究了双源膨胀体系在模拟上述工况下的混凝土限制膨胀率和开裂情况。结果表明:在20、40和60℃不同养护温度下分别是钙源膨胀剂、钙源与镁源膨胀剂比例35∶65的双源膨胀剂、镁源膨胀剂的28 d混凝土限制膨胀率最高;在不同养护湿度下,湿度越高掺有膨胀剂混凝土的限制膨胀率越高;在模拟工况下,混凝土厚度300、800和1300 mm的温峰值分别为55、63和75℃,最佳膨胀体系前者为钙源与镁源膨胀剂比例35∶65的双源膨胀剂,后两者均为镁源膨胀剂,说明在不同工况下的最佳膨胀体系不同,为不同工况下选用合适膨胀体系提供基础数据和技术支持。To analyze the expansion effect of expansive agents in different environments and their applicable working conditions,the concrete limited expansion rate of calcium source expansion agent,magnesium source expansion agent and their composite dual-source expansion system under different curing temperature and curing system conditions was studied.The temperature history of three typical working conditions of concrete thickness of 300,800 and 1300 mm was tested,and the concrete limited expansion rate and cracking of the dual-source expansion system under the above working conditions were studied.The results show that under different curing temperatures of 20,40 and 60℃,the 28-d concrete limit expansion rate is the highest for calcium-based expansive agents,dual-source expansive agents with a calcium to magnesium ratio of 35∶65,and magnesium-based expansive agents,respectively;under different curing humidities,the higher the humidity,the greater the restricted expansion rate of concrete with expansive admixture.Under three typical working conditions of concrete thickness of 300,800 and 1300 mm,the peak temperatures are 55,63 and 75℃,respectively.The optimal expansion system for the former is a dual-source expansive agent with a calcium to magnesium ratio of 35∶65,while for the latter two,it is a magnesium-based expansive agent,indicating that the optimal expansion system varies under different conditions,which provides basic data and technical support for the selection of appropriate expansive systems under different working conditions.

关 键 词：双源膨胀体系 混凝土 模拟工况 限制膨胀率 抗裂 

分 类 号：TU528[建筑科学—建筑技术科学]