Restrained Early Age Shrinkage at the Vertical Interface Between Freshcementitious Mixtures And Hardened Substratespart-II
Journal Title: International Journal of engineering Research and Applications - Year 2018, Vol 8, Issue 5
Abstract
Casting fresh cementitious materials against a hardened concrete substrate is common for most concrete constructionin repair and retrofitting, leading to cold-joints or construction joints. The potential for problems to arise may be exacerbated when high performance concretes with a lower water-to-cementitious ratio (w/c) is used particularly when restrained early age shrinkage and subsequent drying shrinkage occurs. Such shrinkage may result in micro-racking especially at an interface that is vertically formed between the two cementitious materials, leading to durability issues and premature loss of serviceability. This experimental study in Part II has examined the size effect of early age shrinkage under “sealed” condition in larger size specimens.The results show that the duration during whichdevelopment of early age shrinkage is accompanied by moisture loss through the interfacescan be expected to continuefor a longer duration typically, beyond 24 hours after adding water to the mix. The strategy to minimizing micro-cracks through reducingheat evolution and moisture loss through the interface simultaneously was found to be particularly effective in large sized specimen.
Authors and Affiliations
K. Kawaai, K. C. G. Ong
Keywords
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