多因素影响下泡沫混凝土收缩开裂试验研究

作者：商怀玺¹,孙振鹏²,陈焕斌²,王聪²,张传民²

作者简介：

商怀玺,副高级工程师,E⁃mail:70851008@ qq. com

作者单位：

1. 宁津房开建设投资有限公司,山东德州 253400;2. 中铁建设集团有限公司,北京 100040

基金项目：

∗陕西省科技厅重点研发计划(2025SF⁃YBXM⁃138)

摘要：

通过选取不同的养护温度、湿度、水灰比,制定 6 种养护条件,测量泡沫混凝土试块的收缩变形、最大裂缝宽度,并记录开裂时间. 对比各组试验结果,分析养护温度、湿度及水灰比对泡沫混凝土收缩和抗裂性能的影响,研究影响泡沫混凝土干燥收缩的 3 个因素的主次顺序. 结果表明:温度是影响泡沫混凝土收缩的最主要因素,其次为水灰比,最后为湿度,且 3 种因素的两两交互作用不明显. 提出分级策略:25℃ +RH≥75%+水灰比 0.4 组合可实现收缩率≤1 600×10-6 与开裂时间≥70. 8h 的协同优化;温带干燥区推荐 40℃ +RH = 60% +水灰比 0.4 的平衡方案.

关键词：泡沫混凝土;水灰比;干燥收缩;开裂;养护;耦合效应

English：

Different curing temperature, humidity and water⁃cement ratio were selected to formulate6kinds of curing conditions. The shrinkage deformation and maximum crack width of foam concrete testblock were measured, and the cracking time was recorded. By comparing the test results of each group,the effects of curing temperature, humidity and water⁃cement ratio on the shrinkage and crack resistanceof foamed concrete were analyzed, and the primary and secondary order of the three factors affecting thedrying shrinkage of foamed concrete was studied. The results show that temperature is the most importantfactor affecting the shrinkage of foamed concrete, followed by water⁃cement ratio, and finally humidity,and the interaction of the three factors is not obvious. A grading strategy was proposed: 25℃ + RH≥75% + water⁃cement ratio 0.4 can achieve synergistic optimization of shrinkage rate≤1 600×10-6andcracking time ≥ 70.8h. The balance scheme of 40℃ + RH = 60% + water⁃cement ratio 0.4isrecommended for the temperate dry zone.

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试验研究 > 2026年 第卷 第10期