砂浆特性参数对硅酸根电迁移反应法致密化和表面涂覆效果影响

Effects of mortar properties on densification and surface coating through electro-migration reaction of silicate ions

采用硅酸根电迁移反应法致密化和表面涂覆砂浆,研究了水胶比、矿物掺和料、养护龄期和试件厚度等砂浆特性参数对被处理砂浆试件表面涂层厚度、抗压强度与抗折强度、电阻率的影响。结果表明:随着水胶比的减小与养护龄期的延长,砂浆试件生成的表面涂层增厚,抗压强度与抗折强度、电阻率提升增大;加入掺合料的砂浆试件形成的涂层厚度和电阻率大小顺序为硅粉>矿粉>无掺合料>粉煤灰,掺硅粉与矿粉的砂浆试件电阻率出现的峰值时间早于无掺合料试件;硅粉砂浆试件的抗压强度、抗折强度增幅大于无掺合料砂浆,而粉煤灰砂浆试件抗压强度与抗折强度变化不明显;砂浆试件厚度对于硅酸根电迁移反应法处理的砂浆性能影响不明显。

Based on densification and surface coating using the electro-migration reaction of silicate ions,the effects of mortar properties,such as the ratio of water to binder,mineral admixture,curing period,and thickness of the specimen,on the surface coating layer thickness,compressive strength,flexural strength,and resistivity of treated mortar specimens were investigated. The results show that the produced coating layer thickness,compressive strength,flexural strength,and resistivity of the specimens increase with the decrease of the ratio of water to binder and the increase of the curing period. The coating layer thicknesses and resistivity of mortar specimens with different admixtures follow an order of silica fume〉 slag 〉control（ without admixtures）〉 fly ash. The times corresponding to the appearance of the resistivity peak of the specimens with silica fume and slag are shortened compared with that of the control specimen. The increments of compressive and flexural strength of the mortar specimens with silica fume are higher than those of the control mortar specimen. However,the addition of fly ash exerts little influence on the compressive strength and flexural strength of electrochemically treated specimens. The thickness of mortar specimens has little influence on the properties of electrochemically treated mortar specimens.