Title:
Use of Air-Entraining Admixtures in Dry-Mix Shotcrete
Author(s):
Ann Lamontagne, Michel Pigeon, Richard Pleau, and Denis Beaupre
Publication:
Materials Journal
Volume:
93
Issue:
1
Appears on pages(s):
69-74
Keywords:
air entrainment; chlorides; scaling; shotcrete; shrinkage;
silica fume.
DOI:
10.14359/9798
Date:
1/1/1996
Abstract:
Tests were carried out to study the influence of the type of cement and the type and dosage of air-entraining admixtures on the properties of dry-mix shotcrete, particularly on resistance to salt scaling. A total of 21 mixes were made using three types of cement (normal portland cement, high-early- strength portland cement, and silica fume cement), three air-entraining admixtures (a synthetic detergent, a sulfonated salt of hydrocarbon, and a vinsol resin), and five dosages of air-entraining admixtures (0, 10, 20, 30, and 40 ml per l of water). The test results show that the use of an air entraining admixture can lead to a significant decrease in the spacing factor and a significant increase in scaling resistance. The results further show that the properties of air-entrained shotcretes made with normal portland cement and high early-strength portland cement were similar; but that drying shrinkage and chloride ion permeability were lower in those containing silica fume.