摘要
高弹性模量的PVA纤维使得PVA自修复砂浆裂缝宽度可控成为可能。通过测试PVA纤维掺量为1.5%的自修复砂浆载荷位移与裂缝宽度分布可以得出,随着载荷位移的增大,小裂缝所占比例降低,大裂缝所占比例增加,但极限拉力条件下,仍可将大于60μm的裂缝控制在20%范围内。干湿循环养护条件下,宽度小于45μm的裂缝能够基本愈合,而宽度大于60μm的裂缝自愈合情况不理想。PVA纤维自修复砂浆裂缝宽度分布与裂缝自愈合情况密切相关,如果能够有效控制PVA自修复砂浆在极限拉力条件下的裂缝分布情况,尤其是宽度大于60μm裂缝百分比,则PVA自修复砂浆用于混凝土裂缝修补是完全可行的。
PVA fiber makes self-healing repair mortar crack width controllability possible because of high elastic modulus. From load displacement and crack width ＇distribution tests when self-repair mortar containing 1.5% of PVA fiber, one can draw a conclusion that as the load displacement increases,the percentage of small cracks is reduced,the proportion of large cracks is increased,but under ultimate tension conditions,cracks larger than 60 μm can still be controlled within 20%. Under the condition of wet-dry cycle curing, cracks less than 45 μm in width can be basically healed,but the self-healing of cracks greater than 60 μm in width is not ideal. The self-repairing mortar crack width distribution of PVA fiber is closely related to the self-healing state of its cracks. If the crack distribution of PVA self-repairing mortar under ultimate tension conditions can be effectively controlled,especially the percentage of cracks greater than 60 μm,it is entirely feasible to use PVA fiber self-repair mortar for repairing concrete cracks.
出处
《新型建筑材料》
北大核心
2015年第10期25-28,共4页
New Building Materials
