Title:
Nucleation and Pozzolanic Factors in Strength Development of Class Fly Ash Concrete
Author(s):
M. K. Gopalan
Publication:
Materials Journal
Volume:
90
Issue:
2
Appears on pages(s):
117-121
Keywords:
compressive strength; concretes; fly ash; mix proportioning; pozzolans; Materials Research
DOI:
10.14359/4005
Date:
3/1/1993
Abstract:
A new model for the analysis of strength development of a Class F fly ash concrete is presented. The analysis shows that the contribution of that fly ash to strength development is dependent on two parameters of the mix. These two parameters, nucleation and pozzolanic factors, conform fully to the effects of proportioning the fly ash mixes. These two parameters are found to be adequate to account for the strength development of fly ash concrete. Results indicate that the methods for the design of fly ash concrete based on a single parameter such as the "cementing efficiency" may not be capable of modeling the strength development accurately. Results also show that the strength contribution up to 28 days can be attributed broadly to nucleation factor and that after 28 days to pozzolanic factor, even though the onset of pozzolanic reaction is found to depend on the fly ash-cementitious ratio of the mix.