氯化钠侵蚀混凝土力学性能的试验研究

为研究NaCl环境下混凝土力学性能的退化规律,采用实验室加速腐蚀的试验方法,利用质量分数分别为10%和20%的NaCl溶液对C30混凝土试件进行侵蚀,对腐蚀后混凝土进行了抗拉和抗压力学性能测试。采用强度退化率和应变能损失率为损伤指标,对不同腐蚀程度混凝土力学性能的退化进行分析。结果表明,强度退化率和应变能损失率可以很好地反映混凝土的受腐蚀程度。在腐蚀作用初期,两者略有降低;随着腐蚀时间的延长和腐蚀液质量分数的增加,两者逐渐增加。

Experimental study on property of concrete corroded by NaCl

Accelerated corrosion testing was carried out under laboratory conditions to investigate mechanical properties of concrete corroded by NaCl.C30 concrete samples were immersed in aggressive solutions which mass fraction of NaCl was 10% and 20% respectively,and compressive and tensile properties of all the corroded specimens were tested.The strength degradation ratio and strain energy loss were selected as damage indexes to analyze the deterioration law of the mechanical properties of concrete in different corrosiveness.Results show that both the strength degradation ratio and strain energy loss can well reflect the damage state of concrete.At the initial corrosion stage,both the damage indices have a slight increase,with the prolonging of corrosion time and the increase of corrosion concentration,the damage indices have a significant increase.