渗透结晶型防护剂对混凝土防水抗蚀性能的影响

Effects of Osmotic Crystalline Surface Protectant on the Waterproofand Anti-corrosion Properties of Concrete

渗透结晶防水材料对混凝土制品表面具有很好的防护作用,实验验证了一种可以在混凝土的孔隙或裂缝里生成疏水性络合物的渗透结晶型表面防护剂(简称OCSP)对混凝土面层防水抗腐蚀性能的影响。涂刷量为225 g/m^ 2的试块的吸水率低于0.4%,比未处理试块的吸水率降低约75%,OCSP具有密实填充和抗水渗透功能;酸、碱、盐等强电解质溶液长期浸泡降低砂浆层的抗渗透防水性,强酸对砂浆表面具有明显破坏侵蚀作用,其质量降低,而在碱和盐溶液环境中砂浆表面密实性和质量增加,涂刷OCSP砂浆层具有明显的延迟化学侵蚀的作用;涂刷200~300 g/m^ 2的OCSP表面护理剂后混凝土28 d的碳化深度接近于零,可以防止普通环境下混凝土构件钢筋保护层的中性化问题。

The osmotic crystallization waterproof material has a good protective effect on the surface of concrete products.Experiments verified an Osmotic crystalline surface protectant(OCSP)could form a hydrophobic complex in the pores or cracks of concrete and affect the waterproof and corrosion resistance of the surface layer of concrete.The water absorption of the test pieces with a coating amount of 225 g/m ^2 is less than 0.4%,which is about 75%lower than that of the untreated test pieces,so the OCSP has a function of dense filling and water penetration resis-tance.The resistance to penetration and water repellency of the mortar layer was reduced as long-term immersion in strong electrolyte solutions such as acid,alkali and salt,the strong acid has obvious damage and erosion on the surface of mortar.However,in the environment of alkali and salt solution,the surface density and weight of the mortar would be increased,the mortar layer with OCSP has obvious delayed chemical attack and the carbonization depth was close to zero for 28 days as concrete coated with 200-300 g/m ^2 which could well prevent the neutralization of reinforcement protection layer of concrete members in ordinary environment.