Experimental study of impermeability in defect repair bond of concrete

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.

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