摘要
测试了PVA纤维增强水泥基修补砂浆的力学性能和冲蚀磨损性能,研究了PVA纤维掺量对水泥砂浆力学性能和冲蚀磨损性能的影响。试验结果表明:水泥砂浆的抗压强度和抗折强度均随PVA纤维掺量的增加先增加后减小,但PVA纤维对抗折强度的影响更加明显,当PVA纤维的掺量为1. 5 kg/m3时,其抗折强度、抗压强度分别达到5. 14 MPa和42. 5 MPa,相比于空白样分别提高了68. 5%和31%;PVA纤维增强水泥砂浆的冲蚀率随冲蚀速度的增大而增加,但在各个冲蚀速度下添加了PVA纤维的试样的冲蚀率明显低于空白样的冲蚀率,在35 m/s的高冲蚀速度下,PVA纤维掺量为1. 5 kg/m3试样的冲蚀率相比空白样的冲蚀率降低了44. 5%;空白样的冲蚀率随冲蚀角度的增加而增大,显示典型脆性材料的冲蚀特征,而添加了PVA纤维的水泥砂浆的冲蚀率随冲蚀角度的增加呈现锯齿状波动,表现出半塑性材料的冲蚀特性;PVA纤维的掺量为1. 5 kg/m3时,修补砂浆的施工性良好,其强度和冲蚀抗力均较高,是适宜现场施工的合理掺量。
The mechanical properties and erosion wear properties of PVA fiber reinforced cement matrix mortar were tested,and the effect of PVA fiber content on these properties was studied. The results show that the compressive strength and flexural strength of cement mortar increase first and then decrease with the increase of PVA fiber content,but the addition of PVA fiber is more obvious to improve the flexural strength of cement mortar. When the content of PVA fiber is 1. 5 kg/m3,the flexural strength and compressive strength reach 5. 14 MPa and 42. 5 MPa,respectively,which increase by 68. 5% and31% compared with the blank sample. The erosion rates of PVA fiber reinforced cement mortar increase with the increase of erosion velocity. However,the erosion rates of samples with PVA fiber are significantly lower than that of samples without PVA fiber at various erosion velocities. At the erosion velocity of 35 m/s,the erosion rate of the sample with PVA fiber content of 1. 5 kg/m3 is 44. 5% lower than that of the blank sample. The erosion rates of cement mortar without PVA fiber increase with the increase of erosion angle,which shows erosion characteristics of typical brittle materials. However,the erosion rates of samples with PVA fiber fluctuate zigzag with the increase of erosion angle, which shows erosion characteristics of semi-plastic material. When the content of PVA fiber is 1. 5 kg/m3,the workability of repairing mortar is well,and its strength and erosion resistance are relatively excellent,which is a reasonable content suitable for on-site construction.
作者
王彦平
陈昶旭
张戎令
王起才
WANG Yan-ping;CHEN Chang-xu;ZHANG Rong-ling;WANG Qi-cai(School of Material Science and Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《硅酸盐通报》
CAS
北大核心
2019年第12期3752-3758,共7页
Bulletin of the Chinese Ceramic Society
基金
长江学者和创新团队发展计划滚动支持项目(IRT_15R29)
兰州交通大学优秀平台支持项目(201606)
