Y型钢管混凝土配比优化试验研究  

Experimental Study on Optimization of Concrete Ratio of Y-Shaped Steel Pipe

作　　者：焦立颖 宋少民 马永胜 张全贵 JIAO Liying;SONG Shaomin;MA Yongsheng;ZHANG Quangui(Beijing Key Laboratory of Building Structure and Environmental Remediation Functional Materials,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Key Laboratory of Cement Concrete Energy Saving and Waste Recycling Technology,Beijing 100096,China;Beijing Institute of Building Materials Industry Information Technology,Beijing 100005,China)

机构地区：[1]北京建筑大学建筑结构与环境修复功能材料北京市重点实验室,北京100044 [2]水泥混凝土节能利废技术北京市重点实验室,北京100096 [3]北京建筑材料工业情报技术研究所,北京100005

出　　处：《粉煤灰综合利用》2025年第1期39-44,共6页Fly Ash Comprehensive Utilization

摘　　要：随着钢结构日益增多,钢管混凝土结构因管内混凝土收缩引起的脱空一直是工程界的难题,本研究依托北京市昌平区大型商业建筑Y型钢管柱,通过优选原材料品种、掺加高性能膨胀剂和优质矿物掺合料、使用缓凝型减水剂对钢管混凝土配合比进行了优化研究,得到了钢管混凝土的配合比一系列优化研究数据。结果表明:当膨胀剂掺量为8%时,混凝土的工作性能优异,满足钢管混凝土浇筑施工要求;密闭状态下混凝土的自由膨胀率和限制膨胀率在7 d最大,14 d趋于稳定,混凝土的膨胀值可抵抗混凝土的收缩,钢管混凝土综合性能最优。当膨胀率掺量为8%时,钢管混凝土的管壁与核心混凝土贴合密实,未产生脱空。优化后的配合比可用于实际工程。With the increasing number of steel structures,the problem of voids caused by the shrinkage of concrete inside the steel tube concrete structure has always been a challenge in the engineering field.This study relies on the Y-shaped steel tube columns of large commercial buildings in Changping District,Beijing,and optimizes the mix proportion of steel tube concrete by selecting raw material varieties,adding high-performance expansion agents and high-quality mineral admixtures,and using retarding water reducers.A series of optimization data for the mix proportion of steel tube concrete have been obtained.The results show that when the dosage of expansion agent is 8%,the workability of concrete is excellent and meets the requirements of steel tube concrete pouring construction;The free expansion rate and restricted expansion rate of concrete in a closed state reach their maximum at 7 days and tend to stabilize at 14 days.The expansion value of concrete can resist the shrinkage of concrete,and the comprehensive performance of steel tube concrete is optimal.When the expansion rate is 8%,the wall of the steel tube concrete is tightly adhered to the core concrete,no void occurred.The optimized mix ratio can be used in practical engineering.

关 键 词：钢管混凝土 配合比 膨胀剂 限制收缩 应变 

分 类 号：TU528[建筑科学—建筑技术科学]