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GEOREF RECORD

Natural pozzolans for concrete

Richard Childs Mielenz, Kenneth Titsworth Greene and Nicholas Cyril Schieltz
Natural pozzolans for concrete
Economic Geology and the Bulletin of the Society of Economic Geologists (May 1951) 46 (3): 311-328

Abstract

Many geologic formations in the United States yield pozzolans or materials which can be converted into pozzolans by grinding and calcination. When properly selected, processed, and used, pozzolans will reduce costs, improve quality of concrete, protect concrete against effects of reaction between aggregate and cement alkalies, and inhibit attack by aggressive waters. With improved knowledge of their properties and sources, use of pozzolans is increasing. The geologist and petrographer can aid materially in the search for and exploitation of deposits, and in selection of processing methods.Natural pozzolans owe their activity to five substances, namely: volcanic glass, opal, clays, zeolites, and hydrated aluminum oxides. Each active substance contributes characteristic properties to the pozzolan; consequently, the quality of proposed materials and need for special processing usually can be predicted from petrographic analyses.Geologic formations known to yield pozzolans are indicated, and data on 95 samples representative of tested formations are summarized. Properties and response to heat treatment of pozzolans of the various activity types are discussed.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 46
Serial Issue: 3
Title: Natural pozzolans for concrete
Pages: 311-328
Published: 195105
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
Accession Number: 1959-021056
Categories: Economic geology of nonmetal deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1959
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