This article evaluated the effect of improved autogenous mortar self-healing in the alkali-aggregate reaction (AAR). Prismatic mortar specimens were cast with different contents of polypropylene microfiber and crystalline admixture. The crack-induction method (for subsequent self-healing) was the AAR accelerated mortar bar test itself. After AAR-testing, the specimens were submitted to wetting and drying cycles to stimulate the self-healing mechanism. These two approaches (AAR and self-healing steps) were alternately repeated four times. The results showed that the reference mortar and the mixture with 1% of polypropylene microfiber had the highest and lowest levels of expansion, respectively. The expansion rate was lower for the combined mixtures, although the initial values of length change were high. The visual inspection confirmed that improved autogenous self-healing could close cracks caused by AAR and promote microstructural densification.

本文评估了碱骨料反应（AAR）中改进的自生砂浆自修复的效果。用不同含量的聚丙烯微纤维和结晶混合物浇铸棱柱形砂浆标本。裂纹诱导方法（用于随后的自愈）是AAR加速砂浆棒试验本身。经过AAR测试后，将样品进行润湿和干燥循环以刺激其自我修复机制。这两种方法（AAR和自我修复步骤）交替重复四次。结果表明，参比砂浆和含1％聚丙烯超细纤维的混合物分别具有最高和最低的膨胀率。尽管长度变化的初始值较高，但混合后的混合物的膨胀率较低。