Title:
Use of Blended Silica Fume Cement in Commercial
Concrete Mixtures
Author(s):
K. H. Khayat, M. Vachon, and M.-C. Lanctot
Publication:
Materials Journal
Volume:
94
Issue:
3
Appears on pages(s):
183-192
Keywords:
bleeding; durability; freeze-thaw; permeability; scaling; setting
(hardening); silica fume; slump loss; strength; temperature rise.
DOI:
10.14359/9873
Date:
5/1/1997
Abstract:
As the use of blended silica fume cement in commercial concrete construction increases, it is important to evaluate the influence of such types of cement on important characteristics of fresh and hardened concrete. The objective of this paper is to provide data about various properties of concrete made with the relatively new type of cement, a blended silica fume cement, and to compare them to values obtained with similar mixtures containing standard Canadian CSA Type 10 and Type 20 portland cements (similar to ASTM C 150 Type I and Type II cements). A total of 26 concrete mixtures typical of commonly used mixtures in the construction industry in Eastern Canada were evaluated. Half of the mixtures were air entrained and had water-cementitious materials ratios of 0.33 to 0.59. The remaining half of the mixtures were not air entrained and had water-cementitious materials ratios varying between 0.45 and 0.69. The mixtures were tested for consistency, air content, external bleeding, time of setting, temperature rise, compressive strength development, rapid chloride ion permeability, air-void system, freeze-thaw durability, and scaling resistance. Compared to similar concretes containing Type 10 and Type 20 cements, the use of blended silica fume cement was found to increase cohesiveness and strength, reduce permeability, and enhance scaling resistance. The rel-ative beneficial effect of using the blended silica fume cement increased with the increase in water-cementitious materials ratio and the decrease in cement content.