Comparison between the permeability water and gas permeability of the concretes under the effect of temperature

Characterization of permeability is essential to fully describe the transport phenomena occurring in porous medium at elevated temperatures. The aim of this work is to study the evolution of the inherent gas and water permeability of concretes with temperature variations. The tests were performed on two types of concretes (ordinary and pozzolanic) using Algerian local products. Addition of natural pozzolan, promoting use of local products, with a rate of 15% was incorporated in the pozzolanic concretes and samples (11x22cm) were subjected to different temperatures (200 degrees C, 300 degrees C, 400 degrees C, 600 degrees C and 700 degrees C). After cooling, gas and water permeability using, respectively, CEMBUREAU and CONTROLAB permeability devices were measured and loss of mass and compressive strength were then conducted. Experimental results of permeability and mechanical strength variations are shown and pozzolanic concretes depicted better characteristics both in terms of gas and water permeability as well as compressive strength in comparison with ordinary concrete. (C) 2017 The Authors. Published by Elsevier Ltd.