中文摘要：

通过裂缝测宽仪分析讨论了Na Cl、Na_2CO_3和Na_2SO_4三种盐溶液环境对不同宽度的水泥砂浆裂缝自修复效果的影响,并研究了水泥砂浆试样在上述不同盐环境下的修复前后强度变化。结果表明,在Na Cl和Na_2SO_4溶液中,随着溶液浓度（0、0.5%、1.0%、2.0%）的升高,裂缝自修复能力呈现出先升高后降低的趋势,并且当溶液浓度为0.5%时,可以修复裂缝为0.02mm的宽度;在Na_2CO_3溶液中,随着溶液浓度的升高（0、0.5%、1.0%、2.0%）,裂缝自修复效果有升高的趋势,并且当Na_2CO_3溶液浓度为2.0%时,可以修复裂缝为0.02mm的宽度;裂缝自修复的主要原因是未水化水泥颗粒的继续水化,同时溶液中不同离子与水泥水化产物反应的生成物也可以促进裂缝修复。

英文摘要：

The influences of three different salt solutions（Na Cl、Na_2CO_3 and Na_2SO_4） on self-healing effect of cement mortar cracks with different width were researched by crack width gauge and the strength changes of cement mortar before and after self-healing in the different salt environments were also studied. The results indicate that the self-healing capability of cement mortar first increased and then decreased with the increasing of solution（Na Cl and Na＋2SO＋4） concentrations（0、0.5% 、1.0% 、2.0%）. The crack width（0.02mm） of cement mortar could be healed when the solution concentration is 0.5%. The self-healing capability of cement mortar increased with the increasing of Na_2CO_3 solution concentrations（0、0.5%、1.0%、2.0%）. The crack width（0.02mm） could be healed when the Na_2CO_3 solution concentration is 2.0%. The main self-healing reason is that the un-hydrated cement particles continues to hydrate and the production matters produced by different ions in different solutions reaction with the cement hydration products could promote the healing effect of cement mortar.