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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(guó)家重點(diǎn)實(shí)驗(yàn)室， 西安 710048；3 中國(guó)電建集團(tuán)西北勘測(cè)設(shè)計(jì)研究院有限公司， 西安 710065）

［摘要］通過采用快速凍融法對(duì)高延性混凝土（HDC）試件進(jìn)行了不同凍融循環(huán)次數(shù)下單軸受壓試驗(yàn)，研究HDC的抗凍性能，測(cè)定不同凍融循環(huán)次數(shù)作用后HDC的表觀特征以及質(zhì)量變化。同時(shí)，采用超聲波平測(cè)法對(duì)不同凍融循環(huán)次數(shù)HDC損傷層厚度進(jìn)行測(cè)定，研究?jī)鋈谘h(huán)對(duì)混凝土損傷層厚度的影響規(guī)律。研究結(jié)果表明：HDC在凍融循環(huán)作用下質(zhì)量最大損失率僅為0.004%，HDC試件未出現(xiàn)明顯剝落，表現(xiàn)出良好的抗凍性能。通過分析HDC損傷層厚度及損傷層平均抗壓強(qiáng)度試驗(yàn)數(shù)據(jù)，對(duì)預(yù)測(cè)模型計(jì)算結(jié)果與試驗(yàn)結(jié)果進(jìn)行比較，發(fā)現(xiàn)模型計(jì)算值與試驗(yàn)值基本一致。

［關(guān)鍵詞］高延性混凝土；凍融試驗(yàn)；損傷層厚度；超聲波波速

中圖分類號(hào)：TU375文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)04-0091-05

Study on damage of high ductility concrete under freeze-thaw cycle by ultrasonic wave

KOU Jialiang1,2， ZHANG Zhuoyue1， SUN Guoxing1， ZHANG Jiawei1， ZHOU Heng3

（1 School of Civil Engineering & Architecture, Xi′an University of Technology, 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 Northwest Engineering Corporation Limited, Power China, Xi′an 710065, China）

Abstract:The high ductility concrete (HDC) specimens were subjected to uniaxial compression tests under different freeze-thaw cycles by using the rapid freeze-thaw method to study the freezing resistance of HDC, and to determine the apparent characteristics of HDC under different freeze-thaw cycles. In addition, ultrasonic testing method was used to determine the damaged layer thickness of HDC specimens under different freeze-thaw cycles, thereby the influence law of freeze-thaw cycle on the damaged layer thickness of concrete was studied. Research results indicate that the mass maximum loss rate of HDC is only 0.004% under freeze-thaw cycles. The HDC specimen did not peel off significantly and showed good frost resistance. By analyzing the HDC damage layer thickness and the average compressive strength test data of the damage layer, the calculated results of the prediction model are compared with the experimental results, it is found that the calculated values of the model are basically consistent with the experimental values.

Keywords:high ductile concrete; freeze-thaw test; damaged layer thickness; ultrasonic wave velocity

*國(guó)家自然科學(xué)基金資助項(xiàng)目(52079109,51408487)，陜西省自然科學(xué)基礎(chǔ)研究項(xiàng)目(2020JM-454)。

作者簡(jiǎn)介：寇佳亮，博士，副教授，Email:jialiangkou0918@163.com。