- 摘 要
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（1 西安理工大學(xué)土木建筑工程學(xué)院， 西安 710048； 2 西安理工大學(xué)省部共建西北旱區(qū)生態(tài)水利國家重點實驗室, 西安 710048；3 鄭州科技學(xué)院土木建筑工程學(xué)院, 鄭州 454000）
［摘要］高延性混凝土（HDC）具有良好的拉伸應(yīng)變-硬化特性和裂縫控制能力，受拉狀態(tài)下產(chǎn)生多條細(xì)密裂紋，這使得HDC極有可能具有良好的抗凍性能?；诖耍ㄟ^采用快速凍融方法對21個HDC試件進(jìn)行了凍融循環(huán)試驗來研究HDC的抗凍性能，其中，3個HDC棱柱體試件進(jìn)行凍融循環(huán)試驗，18個HDC立方體試件進(jìn)行不同凍融循環(huán)次數(shù)下單軸受壓試驗，測定不同凍融循環(huán)次數(shù)作用后HDC的表觀特征以及各項基本力學(xué)性能，包括極限承載力、動彈性模量、峰值應(yīng)變和裂縫狀態(tài)。試驗結(jié)果表明，經(jīng)過300次凍融循環(huán)后HDC具有良好的裂縫控制能力，試件出現(xiàn)較少的細(xì)密裂紋，表現(xiàn)出良好的抗凍性能。通過分析HDC凍融試驗應(yīng)力-應(yīng)變曲線，得到HDC凍融本構(gòu)關(guān)系曲線，且與試驗曲線對比，發(fā)現(xiàn)本構(gòu)模型曲線與試驗曲線較為吻合。
［關(guān)鍵詞］高延性混凝土； 凍融循環(huán)； 凍融本構(gòu)關(guān)系； 單軸受壓； 動彈性模量
中圖分類號：TU502+.6文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2019)05-0125-06
Experimental study on mechanical properties of high ductile concrete under freezing-thawing cyclic erosion
Kou Jialiang1,2, Lin Yadang1,3, Xi Fangyong1
(1 School of Civil Engineering & Architecture, Xi′an University of Tcchnology, Xi′an 710048, China；2 State Key Laboratory of Eco-hydraulics in Northwest Arid Region， Xi′an University of Technology, Xi′an 710048, China；3 School of Civil Engineering & Architecture, Zhenzhou University of Science & Technology, Zhenzhou 454000, China)
Abstract:High ductile concrete (HDC) has good tensile strain-hardening properties and crack control ability, and many fine cracks produce under tension, which makes it possible that HDC has good frost resistance. Based on this, 21 HDC specimens were tested by rapid freezing-thawing method to study the freezing-thawing resistance of HDC. Among them, 3 HDC prism specimens were tested by freezing-thawing cycle, 18 HDC cube specimens were tested under uniaxial compression under different freezing-thawing cycles, and the apparent characteristics and basic mechanical properties of HDC after different freezing-thawing cycles were measured, including ultimate bearing capacity, dynamic elastic modulus, peak strain and crack state. The test results show that after 300 freezing-thawing cycles, HDC has good crack control ability, and there are fewer fine cracks in the specimens, showing good frost resistance. By analyzing the stress-strain curve of HDC freezing-thawing test, the constitutive relation curve of HDC freezing-thawing test is obtained, and constitutive relation model curve is in good agreement with the experimental curve.
Keywords:high ductile concrete(HDC); freezing-thawing cycle; freezing-thawing constitutive relation; uniaxial compression; dynamic elastic modulus
*國家自然科學(xué)基金資助項目(51408487)，中國住建部科學(xué)技術(shù)資助項目(2014-K2-037)，中國博士后科學(xué)基金第56批面上資助項目(2014M562437)，陜西省自然科學(xué)基金資助項目(2014JQ7292)，陜西省教育廳專項科學(xué)研究計劃資助項目(14JK1516)，陜西省博士后科學(xué)基金資助項目，西安市建設(shè)科技項目(SJW2015-09)，西安理工大學(xué)科學(xué)研究計劃資助項目(118-211403)。
作者簡介：寇佳亮，博士，副教授,Email: jialiangkou0918@163.com。
