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pH=2.54,5mass%的硫酸铵溶液作为腐蚀介质,以干湿循环为条件,利用冲击球压法研究了混凝土冲击荷载-压痕尺寸、冲击应力-应变关系;对与冲击球压试验相关的其他物理量如抗压强度比、损伤区扩展、试件质量变化及溶液pH值变化等也进行了研究。研究发现冲击球压试验得到的混凝土冲击荷载-压痕尺寸关系曲线在低荷载范围呈双线性关系,且随着腐蚀作用的进行曲线斜率逐渐降低;冲击应力随着应变的增加而降低,且随着腐蚀作用的进行冲击应力-应变关系斜率整体降低。随着冲击荷载的增加,球头对混凝土表面造成的磨损、损伤以及局部变形程度远远高于荷载增加速率。在一定时间范围内,酸性硫酸铵溶液不会对混凝土的宏观力学性能产生较大的影响,但是发生的腐蚀反应却足以改变混凝土表面的性质。
pH = 2.54,5mass% ammonium sulfate solution as the corrosive medium, wet and dry cycle conditions, the use of impact ball pressure method to study the concrete impact load - indentation size, impact stress - strain relationship; and impact ballistic test-related Other physical quantities such as compressive strength ratio, lesion expansion, sample quality changes and solution pH changes were also studied. The results show that the impact-load-indentation curve obtained by impact-ball-pressure test shows a bilinear relationship in the low load range and the curve slope decreases with the progress of corrosion. The impact stress decreases with the increase of strain With the impact of corrosion impact stress - strain relationship overall slope decreased. With the increase of impact load, the abrasion, damage and local deformation caused by the ball head to the concrete surface are much higher than the load increase rate. In a certain period of time, acid ammonium sulfate solution will not have macroscopic mechanical properties of concrete have a greater impact, but the corrosion reaction is enough to change the nature of the concrete surface.