复杂环境作用后混凝土接触损伤的评价

Contact damage of concrete in multiple environment

用冲击球压法研究了混凝土在室外、水和硫酸盐溶液中的压痕-应力关系和接触损伤的规律。结果表明:在不同环境下硬化阶段的混凝土的弹性模量随着龄期而增长,其中在硫酸盐溶液中增加最快,水中试件弹性模量次之,室外试件弹性模量增长最慢;对90d试件进行高温后的试验结果表明:水中试件表面力学性能降低程度最大,硫酸盐溶液中试件次之,室外试件降低程度最小,随着环境的逐步恶化,混凝土表面力学性能与整体力学性能之间的差距逐渐缩小。另外,对用球接触方法评价混凝土材料表面损伤程度的可行性和简便性进行了验证。

Indentation stress-strain curves and contact damage of concrete in water,outdoors,5 % Na2SO4 solution were investigated via sphere impacting.The elastic modulus of concrete in different environment was measured from the order of max as follows:concrete in 5 % Na2SO4 solution,in water,outdoors.Surface Mechanical Properties of concrete after high temperature in 90d was measured form the order of mas as follows:concrete in outdoors,in 5 % Na2SO4 solution,in water.In addition,the surface damage degree could be evaluated conveniently by sphere contact method.