A recent advance in construction technology is the use of self-healing cementitious materials containing synthetic microfibers and superabsorbent polymers. By stimulating autogenous healing by means of superabsorbent polymers, cracks are closed and this will cause an increase in durability and service life. However, this improved healing capacity has not been quantified yet in terms of increased further hydration and volume of healing products. This is needed to model the material and to stimulate the practical application in constructions. This paper provides quantitative data, obtained by an NMR study. Addition of 1 m% of selected superabsorbent polymer versus cement to a cementitious material, stimulated further hydration with nearly 40% in comparison with a traditional cementitious material, if 1 h water contact per day was allowed. At 90% relative humidity, no healing was observed in reference samples. While the further hydration around a crack in specimens with superabsorbent polymers was still 68% of that of a reference system with cyclic water contact, due to the uptake of moisture by the superabsorbent polymers. As such, NMR results quantify the positive influence of superabsorbent polymers in terms of stimulated autogenous healing and substantiate their benefits for application in the construction area.

中文翻译：

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用NMR定量测定的超吸收性聚合物在胶凝材料中的自愈。

建筑技术的最新进展是使用了包含合成超细纤维和超吸收性聚合物的自修复水泥材料。通过利用超吸收性聚合物刺激自体愈合，可以消除裂纹，这将增加耐用性和使用寿命。然而，就进一步水合和治疗产品体积的增加而言，尚未确定这种改善的治疗能力。这是对材料进行建模并激发其在建筑中实际应用所必需的。本文提供了通过NMR研究获得的定量数据。如果允许每天接触水1小时，则将1m％的选定的超吸收性聚合物（相对于水泥）添加到水泥质材料中，与传统的水泥质材料相比，可进一步水化近40％。相对湿度为90％时，参考样品中未观察到愈合。尽管由于高吸收性聚合物吸收了水分，所以在具有高吸收性聚合物的样品中，裂纹周围的进一步水合作用仍是循环水接触的参考体系的68％。这样，NMR结果量化了超吸收性聚合物在刺激的自愈方面的积极影响，并证实了其在建筑领域中的应用优势。