PVA纤维及尾矿砂掺量对GTCC自愈合性能影响

针对最新开发的绿色韧性水泥基材料的自愈合性能,参考国内外水泥基复合材料的自愈合理论与试验研究,采用强度恢复法对经过预制裂纹处理、自愈合养护至不同龄期的试件进行抗压强度试验并计算其强度恢复率.分析不同纤维体积掺量及尾矿砂替代天然砂比率对该水泥基复合材料自愈合性能的影响规律.结果表明,利用尾矿砂部分替代细骨料可以提高GTCC的自愈合性能.在不影响GTCC抗压强度的前提下,合理使用PVA纤维可以提高材料的自愈合能力.

Effect of PVA fiber and tailing sand content on self-healing properties of GTCC

Aiming at the self-healing properties of newly developed green toughness cementitious composite(GTCC), with respect to the theoretical and experimental researches on self-healing of cement-based composite in world wide, the strength recovery method was used to test the compressive strength and calculate the strength recovery rate of specimens subjected to the prefabricated crack treatment and self-healing maintenance to different ages. The effect of different fiber volume fractions and the ratio of tailing sand instead of natural sand on the self-healing properties of cement-based composite was analyzed. The results show that when the tailing sands are used to partitally replace fine aggregate, the self-healing properties of GTCC can be improved. Under the prerequisite for unaffected compressive strength, the rational application of PVA fiber can improve the self-healing ability of composite material.