PVA纤维超高韧性水泥基复合材料的室内研究及现场试验

针对新安江电站厂房顶溢流面抗冲磨防护材料长期在湿热的水中浸泡的环境条件(高温、高湿、振动、高速水流冲蚀),本文选用聚乙烯醇纤维(PVA)超高韧性水泥基复合材料进行了室内性能试验,试验表明,该材料28 d龄期极限拉伸应变可达到2.61%、拉伸强度为3.75 MPa、抗折强度为12.3 MPa,28 d和90 d抗压强度分别为29.1 MPa和44.9 MPa,热水浸泡条件下试件的拉伸强度、抗压强度和抗折强度均有较大提高。通过现场试验,研究了PVA纤维超高韧性水泥基复合材料的拌和、抹面及二次收光、养护等施工工艺,为该材料在溢流面及泄洪道的大面积抗冲磨防护提供了经验。

Laboratory study and field test of ultra-high toughness cement-based composites with PVA fiber

In order to solve the problem of long-term immersion of anti-abrasion materials in environmental conditions of high temperature, high humidity and vibration in top overflow surface of Xinanjiang Power Plant, laboratory performance test of the ultra-high toughness cement-based composites with PVA fibers was carried out in this paper. The test results show that ultimate tensile strain,tensile strength and flexural strength on 28d of the material can reach 2.61%, 3.75 MPa and 12.3 MPa, and the compressive strength on 28d and 90d of the material is 29.1 MPa and 44.9 MPa,respectively. The tensile strength,compressive strength and flexural strength of the specimens soaked in hot water are greatly improved. Construction technology including mixing, plastering, secondary lighting and maintenance of Ultra-high Toughness Cement-based Composites with PVA Fiber are studied in field tests, which provides experience for anti-abrasion protection of this materials on overflow surface and spillway.