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http://dx.doi.org/10.5762/KAIS.2010.11.3.1040

Early-Age Deformation of Very-Early Strength Latex- Modified Concrete with Ultra-Fine Fly Ash Contents  

Choi, Pan-Gil (Department of Civil Engineering, Kangwon National University)
Park, Won-Il (Future Engineering Consultants Corp.)
Yun, Kyong-Ku (Department of Civil Engineering, Kangwon National University)
Lee, Bong-Hak (Department of Civil Engineering, Kangwon National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.11, no.3, 2010 , pp. 1040-1046 More about this Journal
Abstract
The main disadvantage of rapid setting concrete is the occurrence of cracking because of fast hydration reaction due to high thermal expansion and shrinkage. However, if the fly ash is used in concrete, it is possible to prevent cracking since the hydration heat can be decreased. Although Very-Early Strength-Latex Modified Concrete(VES-LMC) is an excellent material, occurrence of cracking has been reported because of high hydration heat. In the present study, new method which can apply the fly ash to the VES-LMC was developed. Research for the new method to improve the safety for the cracking was conducted. Safety was confirmed by reducing the shrinkage and hydration heat in the condition of overcoming the low early-age strength. Detailed conclusions are follows. Early-age compressive strength was decreased a little with increase of UFFA content. However, 28-d compressive strength was statistically insignificant regardless of UFFA contents. If the UFFA is replaced 15% to 20% of unit cement weight in concrete, maximum shrinkage can be reduced up to 43% to 47%. Usage of UFFA in VES-LMC guarantees the safety for cracking since it is very effective to control of early-age shrinkage.
Keywords
Ultra-Fine Fly Ash; VES-LMC; Early-Age Shrinkage;
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