Title:
Mechanical Properties of Concrete Incorporating High Volumes of Fly Ash From Sources in the U.S.
Author(s):
Georges Carette, Alain Bilodeau. Raymond L. Chevrier, and V. M. Malhotra
Publication:
Materials Journal
Volume:
90
Issue:
6
Appears on pages(s):
535-544
Keywords:
abrasion; admixtures; air-entrained concretes; autogenous healing; bleeding (concrete); compressive strength; concretes;fly ash; creep properties; flexural strength; modulus of elasticity; slump; setting (hardening); splitting tensile strength; superplast
DOI:
10.14359/4426
Date:
11/1/1993
Abstract:
Paper presents results of investigations to determine the properties of fresh and hardened high-volume fly ash concretes using eight fly ashes and two portland cements from the U.S. Briefly, in high-volume fly ash concrete, the water and cement content are kept low, at about 115 and 155 kg/m 3 of concrete, respectively, and the proportion of fly ash in the total cementitious materials content ranges from 55 to 60 percent. The properties of fresh concrete investigated included workability, bleeding, setting time, and autogenous temperature rise. The properties of hardened concrete investigated included compressive, flexural, and splitting-tensile strengths, Young's modulus of elasticity, creep, and drying shrinkage. The analysis of the test results lead to the conclusion that high-performance air-entrained high-volume fly ash concrete can be produced with the fly ashes and cements used in this investigation. The concretes so produced have low bleeding, satisfactory slump, and setting characteristics, and low-autogenous temperature rise. These concretes also have excellent mechanical properties at both early and late ages with compressive strengths reaching as high as 50 MPa at 91 days. The creep and drying shrinkage of the concretes investigated are relatively low.