为防止缺陷修补工程中因抗渗性不足影响混凝土结构耐久性, 采用五种不同界面剂进行新混凝土与碳化老混 凝土的黏结抗渗性能试验研究。通过对比新老本体混凝土试件与新老混凝土黏结试件间的渗水高度, 分析其抗渗 性能, 以及界面剂和碳化对新老黏结混凝土抗渗性能的影响规律, 确定最佳界面剂类型及分析其作用机理。结果表 明: 新老碳化与新老未碳化混凝土的黏结抗渗性能弱于新老本体混凝土; 在使用硅灰界面剂与减水界面剂时, 新老 碳化混凝土黏结抗渗性强于新老未碳化混凝土的抗渗性, 且使用硅灰界面剂时抗渗性能最优。

In or der to pr event the effects o f insufficient impermeabilit y o n the durability of concr ete str ucture in defect repair pro2 jects, experimental impermeability t ests wer e conducted for the bo nding lay er of the new co ncr ete and carbonated old co ncr ete u2 sing five different inter face ag ents. The permeabilit y heights between the new and o ld concrete specimens and the new and old co ncr ete bo nding specimens w ere compa red, the im permeability o f bonding co ncr et e and the effect s of carbonization and inter face agent on the impermeability of new and old bonding concrete wer e analy zed, and the best inter face agent and its mechanism wer e determ ined. The r esults show ed t hat the im permeability o f the new and car bonated co ncr ete and the new and non2carbonated co ncr ete are weaker than that o f t he new and o ld co ncr et e in ontolog y. Mor eo ver , use of silica fume int erface ag ent and water re2 ducing agent can enhance the impermeability o f new and carbonated concr ete compared to that o f the new and non2carbonated co ncr ete, and use of silica fume inter face ag ent can prov ide the best impermeability perfo rmance.

河南省教育厅科学技术研究重点项目/ 钢筋混凝土框架结构体系可靠度分析0 ( 13A560730) ; 黄河科技学院科研项目/ 基于钢筋 锈蚀的结构耐久性研究0 ( KYZR201303)