Autogenous shrinkage of high-performance concrete containing fly ash

Author:

Lee H. K.1,Lee K. M.1,Kim B. G.2

Affiliation:

1. Department of Civil and Environmental Engineering, Sungkyunkwan University Suwon, Korea

2. Admixtures Team, R&D Center, Kyunggi Chemicals Ltd Bucheon, Korea

Abstract

This paper focuses on the effect of fly ash on autogenous shrinkage of high-performance concrete (HPC). The stresses induced by autogenous shrinkage were calculated using finite element method and a model for predicting autogenous shrinkage including the effect of fly ash was proposed. Test results show that autogenous shrinkage of HPC with water-to-cementitious materials ratio (w/cm) of equal to or less than 0·35 developed more rapidly than that of normal-strength concrete (NSC) with a w/cm of 0·50. For HPC with the same w/cm but containing fly ash, autogenous shrinkage decreased – the higher the fly ash replacement percentage, the lower the level of autogenous shrinkage. Numerical analysis results show that the tensile stress induced by autogenous shrinkage may cause early-age cracking in HPC. In conclusion, although partial replacement of cement by fly ash could effectively reduce autogenous shrinkage of HPC, incorporating fly ash only might not prevent early-age cracking.

Publisher

Thomas Telford Ltd.

Subject

General Materials Science,Building and Construction,Civil and Structural Engineering

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