Skip to Main Content
Book Chapter

Cement-Aggregate Reaction: What is the Problem?

By
Katharine Mather
Katharine Mather
U. S. Corps of Engineers, Waterways Experiment Station, Jackson, Miss.
Search for other works by this author on:
Published:
January 01, 1958

Abstract

Deleterious cement-aggregate reaction is a reaction between soluble silica in aggregate and the alkali-hydroxides derived from the portland cement, which produces abnormal expansion and cracking of mortar and concrete. The alkalies, sodium and potassium, are normally present in small amounts in portland cement. The reactive siliceous aggregate constituents include widely distributed normal constituents of aggregates.The definitely established reactive constituents of natural aggregates are opal, acid and intermediate volcanic glass, cristobalite, tridymite, chalcedony. Synthetic glasses and silica gel are also reactive. All these substances can be described as "highly siliceous materials which are thermodynamically metastable at ordinary temperatures"–silica not tied up in a crystalline structure that is stable under normal ambient conditions.In 1942 Stanton published an account of some failures of concrete pavements and other concrete structures in coastal southern California from Monterey County south to Los Angeles County. This kind of failure or distress had developed in bridges, pavements, and buildings dating from 1914; it had first been noticed but not identified in 1923. Stanton and the State Division of Highways were aroused by the failure in 1938 of a 2-year-old pavement that buckled at the expansion joints and cracked throughout the length of some of the slabs.After a great deal of investigation in the field and laboratory, Stanton and his colleagues had established some common characteristics of the distressed structures, had some ideas about the causes of the trouble, and had a test method that appeared to pick out undesirable constituents. The common characteristics of the distressed structures were:

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables

Contents

GSA Engineering Geology Case Histories

Engineering Geology Case Histories Number 2

Parker D. Trask
Parker D. Trask
Prepared for the Division on Engineering Geology of The Geological Society of America
Search for other works by this author on:
Geological Society of America
Volume
2
ISBN electronic:
9780813759272
Publication date:
January 01, 1958

GeoRef

References

Related

A comprehensive resource of eBooks for researchers in the Earth Sciences

This Feature Is Available To Subscribers Only

Sign In or Create an Account

This PDF is available to Subscribers Only

View Article Abstract & Purchase Options

For full access to this pdf, sign in to an existing account, or purchase an annual subscription.

Subscribe Now