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Title:

CARBONATE AGGREGATE REACTIONS: RECENT STUDIES AND AN APPROACH TO THE PROBLEM

Accession Number:

00228560

Record Type:

Component

Abstract:

THE RESULTS OF SOME RECENT STUDIES ON CARBONATE AGGREGATE REACTIONS ARE PRESENTED AND THE APPROACH TO THE PROBLEM OF DELETERIOUS BEHAVIOR OF CERTAIN VARIETIES OF CARBONATE ROCKS IN CONCRETE THROUGH A SYSTEMATIC STUDY OF HIGHWAY CONCRETE IS DESCRIBED. EXPANSION STUDIES WERE MADE ON A VARIETY OF CARBONATE ROCKS OCCURRING IN IOWA. QUANTITATIVE CALCITE- DOLOMITE X-RAY DIFFRACTION ANALYSIS OF THE ROCKS INVOLVED INDICATES THAT THE ROCKS CONTAINING DOLOMITE DEDOLOMITIZE TO SOME DEGREE IN ALKALINE SOLUTIONS REGARDLESS OF WHETHER THEY EXPAND OR CONTRACT. THE RESULTS TO DATE FAVOR A CAUSATIVE MECHANISM OF EXPANSION MOST CLOSELY RELATED TO ROCK TEXTURE AND PORE STRUCTURE OF THE ROCK. AN APPROACH TO THE PROBLEM OF WHY CERTAIN CARBONATE AGGREGATES ARE RELATED TO DISTRESS IN CONCRETE HAS BEEN UNDERTAKEN THROUGH A STUDY OF HIGHWAY CONCRETE IN ORDER TO LEARN MORE ABOUT THE CHANGE IN THE ENTIRE SYSTEM' COARSE AGGREGATE, AND THE FINE AGGREGATE-CEMENT PASTE MATRIX. THE STUDY OF CONCRETES OF VARYING AGES WITH GOOD AND POOR SERVICE RECORDS WILL PROVIDE ' /A/ A BASIS FOR UNDERSTANDING HOW ROCKS CONTRIBUTE TO DISTRESS IN CONCRETE, AND /B/ BETTER KNOWLEDGE OF THE CHANGES OR AGING WHICH OCCURS IN CONCRETE.

Supplemental Notes:

Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

Monograph Accession #:

01410012

Language:

English

Authors:

Lemish, John
Moore, William J

Pagination:

pp 57-71

Publication Date:

1964

Serial:

Highway Research Record

Issue Number: 45
Publisher: Highway Research Board

Media Type:

Print

Features:

Figures (9) ; References (13) ; Tables (6)

Uncontrolled Terms:

Pores; X-ray diffraction

Geographic Terms:

Iowa

Old TRIS Terms:

Iowa

Subject Areas:

Bridges and other structures; Geotechnology; Highways; Materials

Files:

TRIS, TRB

Created Date:

Aug 15 2004 2:37AM

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