基于水泥水化度的混凝土早期力学性能发展预测  

MODELING ON MECHANICAL PROPERTIES OF CONCRETE BASED ON CEMENT HYDRATION DEGREE

作　　者：高原[1] 张君[1] 罗孙一鸣[1] 

机构地区：[1]清华大学土木工程系,土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《工程力学》2013年第10期133-139,153,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(50978143;51178248);国家重点基础研究发展计划(973)项目(2009CB623200);高等学校博士学科点专项科研基金课题项目(20100002110016)

摘　　要：实验测量了3个强度等级混凝土(28d抗压强度分别为30MPa,50MPa和80MPa左右)在不同养护条件下典型龄期的P-CMOD曲线,借助断裂力学方法,获得了相应的混凝土开裂强度、抗拉强度和抗弯强度及其随龄期的发展规律,分析了养护条件对混凝土力学性能发展的影响。考虑混凝土内部湿度对水泥水化度的影响,对干燥环境下水泥水化度进行了修正,建立了基于水泥水化度的混凝土开裂强度,抗拉强度和抗弯强度的预测模型。The load-crack mouth opening displacement （P-CMOD） curves at some typical ages were obtained for three kinds of concretes, and their compressive strengthes at 28 days are around 30MPa, 50MPa and 80MPa respectively, through a three-points bending test. From the P-CMOD curves, the development of cracking strength, tensile strength and flexural strength of the three concretes with an age was obtained. The effects of the curing condition on above mechanical parameters were investigated. Taking account of the effects of interior RH on cement hydration, the cement hydration under a drying condition was modified and a cement-hydration-degree based model for cracking strength, tensile strength and flexural strength oredictions was develooed.

关 键 词：混凝土 开裂强度 抗拉强度 抗弯强度 养护 模型 

分 类 号：TU528[建筑科学—建筑技术科学]