建筑结构

2019, v.49;No.500(08) 98-102

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卤水-干湿循环侵蚀下高延性混凝土力学性能试验研究
Experimental study on mechanical properties of high ductile concrete under bittern-wetting-drying cycles

寇佳亮;席方勇;赵坤龙;
Kou Jialiang;Xi Fangyong;Zhao Kunlong;School of Civil Engineering & Architecture, Xi′an University of Technology;State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi′an University of Technology;

摘要(Abstract):

针对青海盐湖地区卤水对混凝土结构较强的侵蚀作用,利用高延性混凝土(HDC)的高延性和裂缝控制能力,有效地抵抗混凝土内部的拉应力,阻止内部开裂,从而一定程度上抵抗卤水对混凝土结构进一步的腐蚀。基于此,通过HDC卤水-干湿循坏侵蚀试验,研究HDC抵抗卤水侵蚀的基本力学性能。采用化学试剂人工配制青海盐湖卤水,对10组立方体试件进行卤水-干湿循环侵蚀试验,以24h为一个循环。每15次循环后取出一组试件测定其受压应力-应变曲线,计算耐蚀系数。试验结果表明,经过150次卤水-干湿循环侵蚀试验后,HDC表面轻微剥落,纤维显露,但整体性良好,抗压强度对比未腐蚀试件降低约25.66%,耐蚀系数降至77%,并提出卤水-干湿循环侵蚀HDC本构模型,与试验曲线对比发现,两者吻合较好。从研究结果可以看出,HDC抗卤水-干湿循环腐蚀性能良好,增强了混凝土结构的耐久性能和使用年限,可以为青海盐湖地区使用HDC提供工程设计经验和理论依据。
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 24 h 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.

关键词(KeyWords): 高延性混凝土(HDC);卤水-干湿循环侵蚀;力学性能;裂缝控制;本构关系
high ductile concrete(HDC);bittern-wetting-drying cycle;mechanical property;crack control;constitutive relation

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51408487);; 中国住建部科学技术资助项目(2014-K2-037);; 中国博士后科学基金第56批面上资助项目(2014M562437);; 陕西省自然科学基金资助项目(2014JQ7292);; 陕西省教育厅专项科学研究计划资助项目(14JK1516);; 陕西省博士后科学基金资助项目,西安市建设科技项目(SJW2015-09);; 西安理工大学科学研究计划资助项目(118-211403)

作者(Author): 寇佳亮;席方勇;赵坤龙;
Kou Jialiang;Xi Fangyong;Zhao Kunlong;School of Civil Engineering & Architecture, Xi′an University of Technology;State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi′an University of Technology;

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