Water Permeability of Concrete after Exposed to High Temperatures: doi: 10.14456/mijet.2017.9

Nuttapong Ladbut; Meesakthana Pupitthayatorn; Sahalaph Homwuttiwong

Authors

Nuttapong Ladbut Mahasarakham University
Meesakthana Pupitthayatorn Mahasarakham University
Sahalaph Homwuttiwong Mahasarakham University

Keywords:

fly ash, concrete, high temperature, compressive strength, water permeability

Abstract

The water permeability of fly ash concrete after exposed to high temperatures was investigated in this research. The fly ash samples were represented as the fire building and the deterioration of concrete as evaluated in terms of compressive strength and water permeability were tested and measured. High fineness fly ash was used to replace Portland cement Type I at 10, 20 and 30% by weight of binder. The 90-day concrete samples were heated at 200, 300 and 400 degrees Celsius for each test in the electric chamber for 60 minutes. Suddenly, the concrete samples were rapid cool down in water bath. Compressive strength and water permeability were processed. The experimental results showed that the compressive strength of fly ash concrete with the replacement up to 30% was higher than the ordinary concrete. The compressive strength was reduced when the exposure temperature was increased. For the water permeability, the unheated samples of fly ash concrete gave the lower value than the ordinary concrete. However, when temperature increased, the fly ash concrete had more permeation than the ordinary concrete sample; even the compressive strength was higher.

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