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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）

［摘要］針對(duì)青海鹽湖地區(qū)鹵水對(duì)混凝土結(jié)構(gòu)較強(qiáng)的侵蝕作用，利用高延性混凝土（HDC）的高延性和裂縫控制能力，有效地抵抗混凝土內(nèi)部的拉應(yīng)力，阻止內(nèi)部開(kāi)裂，從而一定程度上抵抗鹵水對(duì)混凝土結(jié)構(gòu)進(jìn)一步的腐蝕?；诖耍ㄟ^(guò)HDC鹵水-干濕循壞侵蝕試驗(yàn)，研究HDC抵抗鹵水侵蝕的基本力學(xué)性能。采用化學(xué)試劑人工配制青海鹽湖鹵水，對(duì)10組立方體試件進(jìn)行鹵水-干濕循環(huán)侵蝕試驗(yàn)，以24h為一個(gè)循環(huán)。每15次循環(huán)后取出一組試件測(cè)定其受壓應(yīng)力-應(yīng)變曲線，計(jì)算耐蝕系數(shù)。試驗(yàn)結(jié)果表明，經(jīng)過(guò)150次鹵水-干濕循環(huán)侵蝕試驗(yàn)后，HDC表面輕微剝落，纖維顯露，但整體性良好，抗壓強(qiáng)度對(duì)比未腐蝕試件降低約25-66%，耐蝕系數(shù)降至77%，并提出鹵水-干濕循環(huán)侵蝕HDC本構(gòu)模型，與試驗(yàn)曲線對(duì)比發(fā)現(xiàn)，兩者吻合較好。從研究結(jié)果可以看出，HDC抗鹵水-干濕循環(huán)腐蝕性能良好，增強(qiáng)了混凝土結(jié)構(gòu)的耐久性能和使用年限，可以為青海鹽湖地區(qū)使用HDC提供工程設(shè)計(jì)經(jīng)驗(yàn)和理論依據(jù)。

［關(guān)鍵詞］高延性混凝土(HDC)； 鹵水-干濕循環(huán)侵蝕； 力學(xué)性能； 裂縫控制； 本構(gòu)關(guān)系

中圖分類號(hào)：TU375文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)08-0098-05

Experimental study on mechanical properties of high ductile concrete under bittern-wetting-drying cycles

Kou Jialiang1，2, Xi Fangyong1, Zhao Kunlong1

(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）

Abstract:As the bittern in the area of Qinghai Salt Lake has a strong corrosive effect on the concrete structure, the high ductility and crack control ability of high ductile concrete (HDC) are used to resist concrete internal tensile stress effectively and prevent internal cracking, to some certain extent, which resists further bittern corrosion on concrete structure. Therefore, the basic mechanical properties of HDC under bittern corrosion were studied by means of bittern-wetting-drying cycles test. In the experiment, the chemical reagent was used to prepare the bittern of Qinghai Salt Lake, and 10 groups of cube specimens were tested by bittern-wetting-drying cycles with 24h as a cycle. After every 15 cycles, a group of specimens was taken out to measure the stress-strain curve and to work out the corrosion resistance index. The results of experiments show that the surfaces of HDC erode and the fiber of them exposes, but the integrity is good after 150 times of bittern-wetting-drying cycles. Compared to untested specimens, the compressive strength of the tested speciomens decreases by about 25-66%, and the corrosion resistance index drops to 77%. Then the constitutive model of HDC under bittern-wetting-drying cycles was proposed which matched with the experimental curve well. From the research results, it can be seen that HDC has good bittern-wetting-drying cycle corrosion resistance, and it can enhance the durability and service life of concrete structures. This can provide engineering design experience and theoretical basis for the use of HDC in Qinghai Salt Lake area.

Keywords:high ductile concrete(HDC); bittern-wetting-drying cycle; mechanical property; crack control; constitutive relation

*國(guó)家自然科學(xué)基金資助項(xiàng)目(51408487)，中國(guó)住建部科學(xué)技術(shù)資助項(xiàng)目(2014-K2-037)，中國(guó)博士后科學(xué)基金第56批面上資助項(xiàng)目(2014M562437)，陜西省自然科學(xué)基金資助項(xiàng)目(2014JQ7292)，陜西省教育廳專項(xiàng)科學(xué)研究計(jì)劃資助項(xiàng)目(14JK1516)，陜西省博士后科學(xué)基金資助項(xiàng)目，西安市建設(shè)科技項(xiàng)目(SJW2015-09)，西安理工大學(xué)科學(xué)研究計(jì)劃資助項(xiàng)目(118-211403)。

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