Acceleration of the Hardening of Concrete Made with Mineral Admixtures by Using a Heat Treatment Process

The heat treatment is widely used to accelerate the gain rate of the precast concrete strength. Generally, the final strength of the heat-treated concrete is lower than that of the reference samples cured under normal conditions. The aim of this experimental work is to investigate the effect of the...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials science and engineering. B 2014-05, Vol.4 (5B)
Main Authors: Riad, Derabla, Larbi, Benmalek Mohamed
Format: Article
Language:English
Subjects:
Admixtures
Age
Concretes
Gain
Heat treatment
Minerals
Strength
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The heat treatment is widely used to accelerate the gain rate of the precast concrete strength. Generally, the final strength of the heat-treated concrete is lower than that of the reference samples cured under normal conditions. The aim of this experimental work is to investigate the effect of the substitution levels (20% and 40%) of cement by mineral admixtures such as ground granulated blast furnace slag (BFS) and limestone filler (LF) on the physical and mechanical characteristics of heat-treated concretes. The carried tests are the porosity, the water absorption capacity and the ultrasonic pulse velocity at the age of 28 days and the compressive strength at the age of 1, 28 and 180 days. The adopted heat treatment cycle achieve the maximum temperature of 60 degree C and has a total duration of 24 h. The obtained results indicate that the heat treatment process used is very efficiency at early age for both mineral admixtures especially with the level of 20%. The heat treatment of the concretes containing LF is of a great interest but the level of developed strengths is low compared to those made with the BFS which is very profitable especially with 20%. The heat-treated concrete made with 20% of BFS is the only concrete having a gain in strength in the long term compared to the reference concrete. The other concretes have globally minimal losses of strength.
ISSN:2161-6221