FROST ACTION IN STABILIZED SOIL MIXTURES

STUDIES WERE MADE ON THE RELATION TO FROST ACTION IN STABILIZED SOIL MIXTURES OF: (1) GRADATION OF SOIL MIXTURE, (2) TYPE AND PERCENTAGE OF ADMIXTURE AND (3) MOISTURE CONTENT AT THE BEGINNING OF THE FREEZING PERIOD. THE MATERIALS TESTED INCLUDE NATURAL SANDY CLAY AND GRADED SOIL MIXTURES COMBINED WITH SODIUM CHLORIDE, CALCIUM CHLORIDE, CALCIUM OXIDE, PORTLAND CEMENT, TAR, EMULSIFIED ASPHALT, CUTBACK ASPHALT, AND ROAD OIL. ONE HUNDRED SIXTY SPECIMENS COMPACTED IN THE LABORATORY IN MOLD 3 IN. IN DIAMETER BY 7 IN. HIGH WERE TESTED. UNDER SIMILAR CONDITIONS OF TEMPERATURE VARIATION, ALL SPECIMENS WERE FROZEN SLOWLY FROM THE TOP DOWN WITH A SUPPLY OF FREE WATER AVAILABLE TO THEIR LOWER SURFACES. THE RESULTS INCLUDE CURVES OF RATE OF HEAVE, CURVES OF EFFECT OF VARIOUS ADMIXTURES, AND CHARTS WHICH SHOW PERCENTAGES OF HEAVE AND CHANGES IN MOISTURE CONTENT FOR VARIOUS CONDITIONS OF ADMIXTURE AND INITIAL WATER CONTENT. THE RESULTS INDICATE THAT DAMAGING FROST ACTION CAN OCCUR UNDER CERTAIN CONDITIONS IN MOST STABILIZED SOIL MIXTURES. THE CURVES AND CHARTS, WHICH CAN BE DISCUSSED ONLY WITH THEIR AID, SIGNIFICANTLY INDICATE TRENDS IN THE EFFECTS OF ADMIXTURE. /AUTHOR/