00228561

Component

http://onlinepubs.trb.org...ubs/hrr/1964/45/45-003.pdf

AN UNDERSTANDING OF THE MECHANISMS OF ALKALI-CARBONATE ROCK REACTION WHICH RESULT IN EXPANSION OF CONCRETE IS OF PRIMARY IMPORTANCE IN DEALING WITH THE RESULTANT PROBLEMS ON A PRACTICAL LEVEL. THIS PAPER REPORTS RESULTS OF LABORATORY STUDIES MADE TO DETERMINE THE CONTRIBUTORY CHEMICAL REACTIONS THAT MAY TAKE PLACE. RESULTS OF PARALLEL STUDIES ON SUCH PHYSICAL ASPECTS AS INTERNAL STRUCTURE OF AND ACCESS OF ALKALIES INTO VARIOUS CARBONATE ROCK TYPES ARE NOT INCLUDED, BUT WILL BE PUBLISHED AT A LATER DATE. THE METHOD OF APPROACH HAS BEEN TO CONSIDER EACH OF THE THREE MAJOR MINERALS OR GROUPS OF MINERALS THAT NORMALLY MAKE UP CARBONATE ROCKS; I.E., QUARTZ, CLAYS AND CARBONATES. THESE WERE INVESTIGATED THROUGH STUDIES OF PURE MINERALS, AS WELL AS REACTIVE AND NON-REACTIVE ROCKS, TO DETERMINE WHAT POSSIBLE ROLE EACH MIGHT PLAY IN OBSERVED EXPANSION IN THE COMPOSITE SYSTEM. THESE MAJOR CONSTITUENTS WERE ANALYZED AND MEASURED BY A VARIETY OF METHODS TO DETERMINE CHEMICAL COMPOSITION, PHASE COMPOSITION, AND VOLUME AND MASS OF THE MATERIALS BEFORE AND AFTER EXPOSURE TO SODIUM AND POTASSIUM HYDROXIDE SOLUTIONS. /MASS AND WEIGHT ARE USED INTERCHANGEABLY THROUGHOUT THIS PAPER./ EVIDENCES OF REACTIONS NOTED DURING THIS PORTION OF THE STUDY WERE THEN SOUGHT IN THIN SECTIONS, TEST PRISMS, AND IN AGGREGATE FROM LABORATORY AND FIELD CONCRETE. /AUTHOR/

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01410012

English

pp 41-56

1964

Highway Research Record

Print

Figures (6) ; References (12) ; Tables (7)

Alkali aggregate reactions; Carbonate rocks; Chemical composition; Chemical reactions; Concrete; Expansion; Hydroxides; Laboratory studies; Machines; Mass; Measurement; Minerals; Potassium; Sodium hydroxide; Volume

Geotechnology; Highways; Materials

TRIS, TRB

Aug 15 2004 2:37AM

• A SURVEY FOR REACTIVE CARBONATE AGGREGATES IN VIRGINIA
• ALKALI REACTIVITY OF DOLOMITIC CARBONATE ROCKS
• ALKALI-CARBONATE REACTIVITY-AN ACADEMIC OR A PRACTICAL PROBLEM
• ALKALI-CARBONATE ROCK REACTION
• ALKALI-CARBONATE ROCK REACTIONS IN MICHIGAN
• ALKALI-REACTIVE CARBONATE ROCKS IN INDIANA - A PILOT REGIONAL INVESTIGATION
• ALKALI-SILICA AND ALKALI-CARBONATE REACTIVITY OF SOME AGGREGATES FROM SOUTH DAKOTA, KANSAS, AND MISSOURI
• ANNOTATED BIBLIOGRAPHY-ALKALI REACTIVITY OF CARBONATE ROCKS PART IV
• CARBONATE AGGREGATE REACTIONS: RECENT STUDIES AND AN APPROACH TO THE PROBLEM
• EXPANSION OF GULL RIVER CARBONATE ROCKS IN SODIUM HYDROXIDE
• LEARNING TO LIVE WITH A REACTIVE CARBONATE ROCK
• METHODS FOR REDUCING EXPANSION OF CONCRETE CAUSED BY ALKALI- CARBONATE ROCK REACTIONS
• VARIATIONS IN PERFORMANCE OF CONCRETE WITH CARBONATE AGGREGATES IN IOWA