【摘要】 为了研究卤水-干湿循环环境下高延性混凝土（HDC）单轴受压力学性能,以3种高浓度卤水溶液为侵蚀介质,对HDC共进行了195次干湿循环试验,分析了卤水与干湿循环共同作用对HDC抗压强度、抗折强度及应力-应变关系的影响。试验结果表明:HDC对卤水有较好的抗侵蚀能力,且破坏时的应变基本保持在（2.5～3.5）%,为延性破坏;在整个循环周期内,试件的质量均出现先降后升的现象,其中溶液3(15%Cl^-+5%SO₄^2-)中的HDC试件在150次循环后质量缓慢增长至94%;溶液3(15%Cl^-+5%SO₄^2-)中HDC抗压强度耐腐蚀系数和抗压强度下降幅度最大,分别为33.1%和50%;根据试验结果,推导出了化学损伤变量的表达式,进一步耦合力学损伤,引入耦合损伤变量D,建立了HDC在力学和化学损伤耦合作用下的弹塑性-化学损伤本构模型。更多还原

【Abstract】 In order to study the uniaxial compression performance of high ductile concrete（HDC） in brine-dry and wet cycle environment,a total of 195 dry-wet cycles tests were carried out on HDC using three high-concentration brine solutions as the erosive medium.The effects of brine and dry-wet cycle on the compressive strength, flexural strength and stress-strain relationship of HDC were analyzed.The results showed that:HDC has a good resistance to brine,and the strain at the time of failure is basically maintained at（2.5～3.5）%, which is a ductile failure; During the entire cycle, the quality of the test specimens first decreased and then increased. The HDC test specimens in solution 3(15%Cl^-+5%SO₄^2-) slowly increased to 94% in quality after 150 cycles;In solution 3(15%Cl^-+5%SO₄^2-), the HDC compressive strength corrosion resistance coefficient and compressive strength decreased the most, respectively 33.1% and 50%;According to the test results, the expression of the chemical damage variable is derived, and the mechanical damage is further coupled, and the coupled damage variable D is introduced.An elastoplastic-chemical damage constitutive model of HDC under the coupling of mechanical and chemical damage was established.更多还原