Cementitious materials are the most widely used in the construction. However, cementitious materials have defects such as low tensile strength which is easy to cause the formation of cracks. In recent years, with the research and application of smart materials, intelligent cementitious materials with self-sensing, self-diagnosis and self-healing functions have received extensive researcher’s attention. In this paper, a polyacrylic hydrogel that could be utilized for self-healing of cementitious materials was designed, and the three-dimensional network structure of the hydrogel controlled the release rate of encapsulated repair agent. The phosphate-incorporated hydrogel was filled into cement slurry to prepare self-healing cementitious materials. After the cement sample cracked and water penetrated into the crack, the phosphate was released from hydrogel. Phosphate reacted with the calcium in the pore solution to form hydroxyapatite type minerals which healed the crack. The self-healing cementitious material is in a position to heal cracks of 300 μm in width. After healing for 28 days at 20oC and 95% of RH, the compressive strength of precracked specimens could reach 85% of that of intact ones.

水泥材料是建筑中使用最广泛的材料。然而，胶凝材料具有诸如低拉伸强度的缺陷，其易于引起裂纹的形成。近年来，随着智能材料的研究和应用，具有自感应，自诊断和自修复功能的智能水泥材料受到了研究者的广泛关注。本文设计了一种可用于胶凝材料自修复的聚丙烯丙烯酸水凝胶，该水凝胶的三维网络结构控制着包胶修复剂的释放速率。将掺有磷酸盐的水凝胶填充到水泥浆中，以制备自修复的胶凝材料。水泥样品破裂后，水渗入裂缝，磷酸盐从水凝胶中释放出来。磷酸盐与孔隙溶液中的钙反应形成羟基磷灰石型矿物，从而治愈了裂缝。自修复水泥材料可以修复宽度为300μm的裂缝。在20oC和相对湿度95％的条件下恢复28天后，预裂样品的抗压强度可以达到完整样品的抗压强度的85％。