Restrained Early Age Shrinkage At The Vertical Interface Between Freshcementitious Mixtures And Hardened Substratespart-I
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 I has examined how restrained early age shrinkage may affect crack formation at the vertical interface formed between freshly cast cementitious mixtures and hardened concrete substrates in a tropical indoor environment (30±0.5ºC and RH of 65±2%) using the image analysis technique. The investigation has revealed that both moisture loss through water absorption via substrates andtemperature rise at an early age during cement hydration was evidently higher with larger micro-cracks being observed at the vertical interfaces of the specimens tested.
Authors and Affiliations
K. Kawaai, K. C. G. Ong
Keywords
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