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

打开文本图片集

2，'，3，（1． 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）

中图分类号：TU528 文献标志码：A 文章编号：1005-8249（2025）01-0039-06

DOI：10.19860/j.cnki.issn1005-8249.2025.01.008

JIAO Liying1，2， SONG Shaomin1， MA Yongsheng3， ZHANG Quangui2

(1. Beijing Key Laboratory of Building Structure and Environmental Remediation Functional Materials， Beijing University of Civil Engineering and Architecture， Beijing 1OOO44， China； 2. Beijing Key Laboratory of Cement Concrete Energy Saving and Waste Recycling Technology，Beijing 100096，China； 3. Beijing Institute of Building Materials Industry Information Technology，Beijing 10005，China)

Abstract：Withthe increasing numberofstel structures，the problemofvoidscaused bytheshrinkageofconcrete inside the steeltubeconcrete structure hasalwaysbeenachaenge intheengineeringfield.ThisstudyreliesontheY-shapedsteeltube columsoflargecommercial buildings in ChangpingDistrict，Beijing，andoptimizes the mix proportionofsteeltubeconcrete by selectingrawmaterialvarieties，adding high-performanceexpansionagentsandhigh-qualitymineraladmixtures，andusing retarding waterreducers.Aseriesofoptimizationdataforthemixproportionofsteeltubeconcretehavebenobtained.Theresults show that when the dosage of expansion agent is 8% ，the workability of concrete is excellent and meets the requirements of steel tubeconcrete pouringconstruction；Thefree expansionrateandrestricted expansionrateofconcreteinaclosed statereach their maximu at7daysandtend to stabilizeat14days.Theexpansion valueofconcretecanresist theshrinkageofconcrete，and the comprehensive performance of steel tube concrete is optimal. When the expansion rate is 8% ，the wall of the steel tube concrete is

材料科学

tightlyadhered tothecoreconcrete，no void occured.Theoptimizedmixratiocan beused inpractical engineering. Key words： concrete filled steel tube；mix proportion；expander；restricted contraction； strain

0 引言

钢管混凝土结构由于混凝土受到钢管壁的紧箍作用，强度和韧性可大幅度提高[1]。（剩余11862字）