Effect of Fly Ash on Durability of High Performance Concrete Composites

Peng Zhang,Qingfu Li

doi:10.19026/rjaset.6.4026

Abstract

A parametric experimental study has been conducted to investigate the effect of fly ash on the durability of the concrete composites. Four different fly ash contents (10, 15, 20 and 25% respectively) were used. The durability of concrete composites includes water impermeability, dry shrinkage property, the carbonation resistance and the freeze-thaw resistance. The results indicate that the addition of fly ash has greatly improved the water impermeability and restricted the dry shrinkage of concrete composites. With the increase of fly ash content, the length of water permeability and the dry shrinkage strain of the specimens have a tendency of decrease with the increase of fly ash content. However, the addition of fly ash has a little adverse effect on the carbonation resistance and freeze-thaw resistance of concrete composites. With the increase of fly ash content, the carbonation depth is increasing and the relative dynamic elastic modulus of the freeze-thaw specimen is decreasing gradually.

Highlights

High Performance Concrete (HPC) can be defined as the concrete, which meets special performance and uniformity requirements that can’t always be achieved by conventional materials, normal mixing, placing and curing practices (Bharatkumar et al, 2001; Zain et al, 2002)
Pozzolanic materials are crucial to HPC as far as flow ability is concerned (Chang, 2004)
This article reports the investigation of the effect of fly ash on durability

Summary

Introduction

High Performance Concrete (HPC) can be defined as the concrete, which meets special performance and uniformity requirements that can’t always be achieved by conventional materials, normal mixing, placing and curing practices (Bharatkumar et al, 2001; Zain et al, 2002). This article reports the investigation of the effect of fly ash on durability For water impermeability of concrete composite test, each set of per composition includes 6 specimens and the average value of the 6 data was computed as the final result (JTJ E30, 2005).

Results

Conclusion