低危害除冰盐对水泥混凝土盐冻破坏的影响及其机理

研究了低危害除冰盐对水泥混凝土表面剥蚀破坏、盐溶液结冰压、混凝土饱水度和混凝土-冰黏结抗折强度的影响.结果表明:掺入添加剂的低危害除冰盐能够明显降低混凝土的盐冻剥蚀破坏;与质量分数为4.00%的NaCl溶液相比,添加剂对盐溶液的结冰压无明显影响,但可以明显降低混凝土-冰的黏结抗折强度和较为明显地降低混凝土的饱水度;基于这些实测数据可以较好地解释低危害除冰盐对混凝土盐冻剥蚀破坏的改善机理.

Effects of a Low Harm Deicing Salt on the Salt Frost Scaling of Concrete and Its Mechanism

The effects of low-harm deicing salt on the salt-frost scaling of concrete surface, the ice-formation pressure of salt solution, the degree of saturation in concrete and the bond strength between concrete and ice were investigated. The results show that the salt scaling of concrete is significantly reduced by the low-harm deicing salt with the additive. Comparing with the 4.00% NaCl solution, the additive has no significant effect on the ice-formation pressure of the salt solution, but significantly reduce the bond strength between the concrete and ice, and the degree of saturation in the concrete decreases. The improving mechanism of the low-harm deicing salt on the salt-frost scaling of concrete is well explained based on these measured data.