Engineered cementitious composite (ECC) has superior self-healing potential compared to ordinary cement-based materials due to well controlled crack width. The effect of exposure conditions on self-healing behavior of ECC incorporating limestone powder (LP) was investigated in this paper. Four mixes with varying LP contents were used to prepare ECC. Pre-cracked specimens were subjected to three different exposure conditions, including water, Na₂SO₄ solution and saturated Ca(OH)₂ solution. The recovery of mechanical and transport properties was investigated by uniaxial tensile and sorptivity tests to characterize self-healing behavior. The experimental results show that ECC exposed to Ca(OH)₂ solution exhibits the best self-heling behavior among all four mixes. The addition of LP is conducive to improving the self-healing behavior of ECC. Further, it was observed by ESEM and XEDS that the cracks after healing were filled with healing products which were mainly composed of calcium carbonate, C–S–H, ettringite as well as carboaluminate, indicating a possible reaction between limestone powder and fly ash.

与常规的水泥基材料相比，工程水泥复合材料（ECC）具有出色的自修复潜力，这是由于裂缝宽度得到了很好的控制。本文研究了暴露条件对掺有石灰石粉（LP）的ECC的自愈行为的影响。使用具有不同LP含量的四种混合物制备ECC。预开裂的样品要经受三种不同的暴露条件，包括水，Na ₂ SO ₄溶液和饱和的Ca（OH）₂溶液。通过单轴拉伸和吸附测试研究了机械性能和运输性能的恢复，以表征其自愈性能。实验结果表明ECC暴露于Ca（OH）₂溶液在所有四种混合物中均表现出最佳的自支撑性能。LP的加入有利于改善ECC的自愈性能。此外，通过ESEM和XEDS观察到，愈合后的裂纹充满了愈合产物，这些愈合产物主要由碳酸钙，CS–H，钙矾石以及碳铝酸盐组成，表明石灰石粉与粉煤灰之间可能发生反应。