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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。
The impact-pressure relationship and contact damage of concrete in outdoor, water and sulphate solutions were studied by impact ballistic method. The results show that the elastic modulus of concrete in different hardening stages increases with age, of which the fastest increase in the sulfate solution, the second is the modulus of elasticity in water, the slowest increase in the modulus of elasticity of outdoor specimens The results of 90d test after high temperature show that the mechanical properties of the surface of the test specimen in water are decreased most, the test specimens in the sulfate solution is the second, and the degree of the test specimen in the outdoor is the smallest. With the gradual deterioration of the environment, the mechanical properties of the concrete surface And the overall mechanical properties of the gap between gradually narrowed. In addition, the feasibility and simplicity of using the ball contact method to evaluate the degree of damage on the surface of concrete materials were verified.