Title:
Influence of Fly Ash on Setting and Hardening Characteristics of Concrete Systems
Author(s):
Tarun R. Naik and Shiw S. Singh
Publication:
Materials Journal
Volume:
94
Issue:
5
Appears on pages(s):
355-360
Keywords:
concrete; compressive strength; fly ash; setting (hardening);
DOI:
10.14359/319
Date:
9/1/1997
Abstract:
This project was carried out to investigate the effect of fly ash obtained from various sources. A reference mixture without fly ash was proportioned to have 28-day design strength of 35 MPa. Fly-ash mixtures were proportioned to contain fly ash in the range of 0 to 100 percent by mass of the cementitious medium. The ratio of fly ash to cement was kept at about 1.25. In general, initial and final times of setting of concretes were greatly affected by both source and fly ash content. The times of setting were generally delayed up to a certain level of cement replacement with fly ash. Beyond this level, which was about 60 percent, rapid setting occurred.