In this study, autogenous crack healing was quantified in mortar specimens under various exposure conditions. Specimens were cracked at 28 days and then exposed to a single type of environment: submersion in freshwater, submersion in marine water or cyclic submersion in marine water followed by drying daily (tidal conditions). Instead of taking measurements at a few selected points along the crack length, crack widths were innovatively determined through periodic measurements monitoring the entire crack surface profile. This enabled the identification of significant variations in the healing profile and evidence of widening mostly due to spalling. Specimens exposed to submerged marine conditions displayed maximum overall healing and were able to completely heal a higher percentage of cracks as wide as 0.72 mm as compared to the 0.6 mm reported in previous studies. Evidence of crack widening due to spalling was found in the crack profiles, and the phenomenon was shown to be dependent on the initial width, with wider cracks showing less absolute widening. Specimens exposed to tidal conditions showed the least crack widening among all exposure conditions.

中文翻译：

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海水暴露下开裂砂浆的自体愈合表征

在这项研究中，在各种暴露条件下对砂浆试样的自生裂纹愈合进行了量化。样品在 28 天后破裂，然后暴露在单一类型的环境中：浸入淡水、浸入海水或循环浸入海水中，然后每天干燥（潮汐条件）。不是在沿裂纹长度的几个选定点上进行测量，而是通过定期测量监测整个裂纹表面轮廓来创新地确定裂纹宽度。这使得能够识别愈合曲线的显着变化和主要由于剥落而变宽的证据。暴露在水下海洋条件下的样本显示出最大的整体愈合，并且与 0.72 毫米宽的裂缝相比，能够完全愈合更高百分比的裂缝。6 毫米在以前的研究中报告。在裂纹剖面中发现了由于剥落而导致裂纹扩大的证据，并且这种现象被证明取决于初始宽度，较宽的裂纹显示出较少的绝对加宽。暴露在潮汐条件下的样品在所有暴露条件中的裂缝加宽最小。