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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(diǎn)實(shí)驗(yàn)室, 西安 710048； 3 陜西省西咸新區(qū)建設(shè)工程質(zhì)量安全監(jiān)督站， 西安 712000; 4 中國電建集團(tuán)西北勘測(cè)設(shè)計(jì)研究院有限公司， 西安 710065）

［摘要］為了研究高延性混凝土（HDC）在鹵水侵蝕作用下的基本力學(xué)性能變化規(guī)律，以3種氯鹽溶液（5%，10%和15%NaCl溶液）和3種鹵水溶液（5%NaCl+5%Na2SO4，5%NaCl+10%Na2SO4和10%NaCl+5%Na2SO4溶液）為侵蝕介質(zhì)，對(duì)HDC試件進(jìn)行鹵水長期浸泡（共360d）試驗(yàn)，分析了不同濃度的鹵水溶液長期浸泡下HDC試件抗壓和抗折強(qiáng)度隨浸泡時(shí)間的變化規(guī)律。試驗(yàn)結(jié)果表明：鹵水溶液的侵蝕現(xiàn)象較單一氯離子溶液明顯，其中5%NaCl+10%Na2SO4鹵水溶液的侵蝕最嚴(yán)重；在整個(gè)浸泡過程中，HDC試件質(zhì)量均出現(xiàn)先降低后上升的變化趨勢(shì)；單一侵蝕溶液中HDC試件的抗壓及抗折強(qiáng)度均出現(xiàn)先增長后降低趨勢(shì)，鹵水溶液中則無侵蝕前期的強(qiáng)度上升階段，隨著硫酸鹽濃度的增加，HDC試件損傷劣化速度變快，且氯離子濃度越高，延緩越明顯。通過回歸分析建立了鹵水長期侵蝕HDC試件強(qiáng)度衰減模型。

［關(guān)鍵詞］高延性混凝土；鹵水侵蝕；長期浸泡；強(qiáng)度衰減模型；力學(xué)性能；損傷劣化方程

中圖分類號(hào)：TU502+.6文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)11-0102-06

Experimental study on mechanical properties and strength degradation model of high ductile concrete under brine erosion

KOU Jialiang1,2, YANG Shun1, ZHAO Jiawei3, WANG Dong1, ZHANG Jing1, ZHOU Heng4

（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 Shanxi Province Xixian New Area Construction Project Quality Safety Supervision Station, Xi’an 712000， China;4 Northwest Survey, Design and Research Intitute of China Power Construction Group Co., Ltd., Xi’an 710065, China）

Abstract:In order to study the basic mechanical properties of high ductility concrete (HDC) under brine erosion, three chloride solutions (5%, 10% and 15% NaCl solution) and three brine solutions (5%NaCl +5%Na2SO4,5%NaCl+10%Na2SO4 and 10% NaCl + 5% Na2SO4 solution) were used as corrosive media. The HDC specimen was subjected to long-term immersion in brine test (360d). The variation of HDC specimens compressive strength and flexural strength with soaking time under different long-term immersion of brine solution were analyzed. The test results show that: the erosion phenomenon of brine solution is more obvious than that of single chloride solution, and the erosion of (5% NaCl + 10% Na2SO4) brine solution is the most serious. During the whole soaking process, the quality of HDC specimens decreased first and then increased. The compressive strength and flexural strength of HDC specimens in single etching solution increased first and then decreased. In the brine solution, there was no intensity rising stage in the early stage of erosion. With the increase of sulfate concentration, the degradation rate of HDC specimens damage became faster, and the higher the ion concentration, the more pronounced the delay. Through regression analysis, a long-term erosion HDC intensity attenuation model of brine was established.

Keywords:high ductile concrete;brine erosion;long-term immersion;strength degradation model;mechanical properties;damage degradation equation

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

作者簡介：寇佳亮，博士，副教授，Email:jialiangkou0918@163.com。