Y型鋼管混凝土配比優(yōu)化試驗研究

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

打開文本圖片集

2，'，3，（1． 建筑結(jié)構(gòu)與環(huán)境修復(fù)功能材料北京市重點實驗室，北京100044；2．水泥混凝土節(jié)能利廢技術(shù)北京市重點實驗室，北京100096；3．北京建筑材料工業(yè)情報技術(shù)研究所，北京100005）

中圖分類號：TU528 文獻標(biāo)志碼：A 文章編號：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

材料科學(xué)

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

0 引言

鋼管混凝土結(jié)構(gòu)由于混凝土受到鋼管壁的緊箍作用，強度和韌性可大幅度提高[1]。（剩余11862字）