Title:
History of chemical admixtures for
concrete
Author(s):
Richard C. Mielenz
Publication:
Concrete International
Volume:
6
Issue:
4
Appears on pages(s):
40-53
Keywords:
accelerating agents; admixtures; calcium
chlorides; history; hydroxylated carboxylic acids; ligno-sulfonate;
melomine-formaldehyde resins; naphthalene
compounds; plasticizers; polysaccharides; retardants;
reviews; water-reducing agents.
DOI:
Date:
4/1/1984
Abstract:
When used in concrete, chemical admixtures have a variety of benefits including water reduction and control setting. Products abused on lignosulfonates and salts of the organic acids were developed about 50 years ago whereas polysaccharide compositions were introduced during the mid 1960s. High-range water-reducing admixtures (superplasticizers) were introduced independently in Japan and Germany in 1964. Now marketed worldwide, water-reducing admixtures are used in almost 3/4 of the concrete produced in the United States and about 90 percent of the concrete produced in Canada.*