Title:
Production and Utilization of Fly Ash in Italy
Author(s):
G. L. Valenti, R. Cioffi, and R. Sersale
Publication:
Symposium Paper
Volume:
91
Issue:
Appears on pages(s):
741-762
Keywords:
Blaine method; calcium oxides; cements; chemical
analysis; fly ash; lime; mechanical properties; mortars (material);
particle size distribution; pozzolans; strength.
DOI:
10.14359/10095
Date:
2/1/1986
Abstract:
The fly ashes produced in Italy generally show good pozzolanic behaviour. Tests made on lime and cement mortars have shown that 4 of the 5 ashes give comparable or even superior performance to that of a natural pozzolan usually employed in the production of portland pozzolan cements. The chemical characteristics were: Si02 42.7-50.2%; Si02+A1203 66.5-77.2%; Si02+A1203+Fe203 75.8-83.5%; loss on ignition 3.9-12.9% and CaO 1.8-9.3%. The calcium oxide content is the parameter that greatly influences the technical behaviour. Glass content ranging from 63 to 75% does not have a dominant influence on mechanical strength. The particle size distribution, rather than the fraction <45pm determines the mechanical characteristics.