CAJ | 학술논문

为了有效评估海水冻融与侵蚀后混凝土的力学性能,基于大型静态和动态刚度伺服压力机进行了混凝土冻融和海水侵蚀后的力学性能试验.对混凝土进行了50,100,200和300次冻融循环,并配置了人工海水；选择了合理的干湿循环机制,对冻融后的混凝土试块进行了10,20,30,40,50和60次干湿循环.对混凝土弹性模量和抗压强度退化规律进行了研究.基于混凝土单轴力学性能和损伤理论,推导了考虑干湿循环次数和冻融循环次数的OttoSen三轴强度.试验研究表明:随着干湿循环和冻融循环次数增加,混凝土轴心抗压强度和弹性模量逐渐下降,强度准则的拉、压子午线逐渐收缩.该研究可为受海水侵蚀在寒冷地区的实际结构抗裂设计提供参考.
위료유효평고해수동융여침식후혼응토적역학성능,기우대형정태화동태강도사복압력궤진행료혼응토동융화해수침식후적역학성능시험.대혼응토진행료50,100,200화300차동융순배,병배치료인공해수；선택료합리적간습순배궤제,대동융후적혼응토시괴진행료10,20,30,40,50화60차간습순배.대혼응토탄성모량화항압강도퇴화규률진행료연구.기우혼응토단축역학성능화손상이론,추도료고필간습순배차수화동융순배차수적OttoSen삼축강도.시험연구표명:수착간습순배화동융순배차수증가,혼응토축심항압강도화탄성모량축점하강,강도준칙적랍、압자오선축점수축.해연구가위수해수침식재한랭지구적실제결구항렬설계제공삼고.
In order to effectively assess the mechanical properties of concrete with freeze-thaw and seawater erosion, tests about basic mechanical properties of concrete after freeze-thaw and seawater erosion are conducted based on the large-scale static and dynamic stiffness servo test set. 50, 100, 200 and 300 cycles of freeze-thaw cycling are made on normal concrete, and the artificial seawater is produced. The reasonable wet and dry accelerate system is selected. 10, 20, 30, 40, 50 and 60 cycles of wet and dry cycling are made to concrete after freeze-thaw cycling. The degeneration law of the concrete elastic modulus and compressive strength is studied. The Ottosen tri-axial strength criterion considering cycles of freeze-thaw and wet and dry cycling is deduced based on uniaxial mechanical properties of concrete and damage theory. Experimental results show that with the increase in the number of wet and dry cycles and freeze-thaw cycles, the concrete axial compressive strength and the elastic modulus decline gradually. Tensile and compressive meridians of concrete shrink gradually. The research can be referenced for anti-crack design of actual structures eroded by seawater at cold regions.