00213850

Component

http://onlinepubs.trb.org...s/hrr/1970/328/328-001.pdf

SIX SELECTED COMMERCIALLY PRODUCED AND 7 TTI KILN- PRODUCED LIGHTWEIGHT COARSE AGGREGATES WERE USED IN 69 BATCHES OF LIGHTWEIGHT CONCRETE. THESE BATCHES OF CONCRETE, CONTAINING THESE COARSE AGGREGATES, AIR ENTRAINMENT, TYPE 1 CEMENT, AND NATURAL SAND, WERE MIXED AND SUBJECTED TO FREEZING AND THAWING IN ACCORDANCE WITH ASTM C290. ABSORPTION CHARACTERISTICS AND POROSITY VALUES WERE DETERMINED FOR EACH OF THE AGGREGATES. VARIOUS DEGREES OF SATURATION OF THE COARSE AGGREGATE AT THE TIME OF MIXING WERE OBTAINED BY IMMERSING THE AGGREGATES IN WATER FOR PERIODS RANGING UP TO 180 DAYS PRIOR TO MIXING. THE RESULTS INDICATE A FAILURE ENVELOPE EXISTS BETWEEN THE NUMBER OF FREEZE-THAW CYCLES TO FAILURE AND THE DEGREE OF SATURATION OF THE COARSE AGGREGATE. THE "CRITICAL" DEGREE OF SATURATION BY VOLUME WAS FOUND TO BE 0.25 (OR 25 PERCENT) BELOW WHICH THE CONCRETE WILL GENERALLY WITHSTAND 300 CYCLES OF FREEZE-THAW. IT WAS ALSO DETERMINED THAT SOME OF THESE AGGREGATES REACHED THIS INITIAL SATURATION AFTER ONLY 30 MINUTES OF IMMERSION, WHILE OTHER AGGREGATES HAD TO BE IMMERSED FOR SEVERAL DAYS BEFORE BECOMING CRITICALLY SATURATED. THE PRACTICAL IMPLICATIONS OF THE TEST RESULTS ARE DISCUSSED. /AUTHOR/

Paper sponsored by Committee on Performance of Concrete--Physical Aspects. 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.

01410267

Chamberlin, W P

pp 1-16

1970

Highway Research Record

Digital/other

Appendices (1) ; Figures (15) ; References (6) ; Tables (1)

Aggregates; Coarse aggregates; Concrete; Concrete curing; Drying; Durability; Freeze thaw tests; Freezing; Lightweight aggregates; Lightweight concrete; Percent saturation; Structural materials; Thaw; Void ratios

Geotechnology; Highways; Materials

TRIS, TRB

Feb 8 1971 12:00AM

• CHLORIDES AND BRIDGE DECK DETERIORATION
• DURABILITY OF CONCRETE BRIDGE DECKS - A REVIEW OF COOPERATIVE STUDIES
• EFFECT OF AGGREGATE TYPE ON THE PROPERTIES OF SHRINKAGE- COMPENSATING CONCRETE
• EFFECTIVENESS OF CORROSION INHIBITORS AND THEIR INFLUENCE ON THE PHYSICAL PROPERTIES OF PORTLAND CEMENT MORTARS
• LABORATORY AND FIELD TESTS ON CONCRETE SEALING COMPOUNDS
• SLOW-COOLING TESTS FOR FROST SUSCEPTIBILITY OF PENNSYLVANIA AGGREGATES
• TEMPERATURE CONTROL OF MASS CONCRETE IN JAPAN
• THE NEW MODEL OF HARDENED PORTLAND CEMENT PASTE