关键词: 砂浆;氯盐侵蚀;镁铝水滑石;氯离子结合能力

Abstract: Through the continuous immersion of 3.5%NaCl solution, the influence of the addition of CLDHs on the penetration resistance of cement mortar to chloride ion was studied from two aspects of the pore structure and the chloride binding capacity of mortar.The results show that compared with the blank mortar,the strength of mortar decreases to some extent with the increase of CLDHs content, but the compactness of pore structure increases accordingly;The addition of CLDHs can significantly improve the resistance to chloride penetration of mortar, the chloride binding capacity of mortar increased by 20%-36%, the penetration depth of chloride ion in 28 d soaked by chloride is reduced by 26%-35%,and the amount of CLDHs should not be too large,which accounts for about 3%of the cementing material.

Key words: mortar;chloride corrosion;Mg-Al-LDHs;chloride binding capacity