00232958

Component

http://onlinepubs.trb.org...s/hrr/1970/315/315-005.pdf

THE ULTIMATE GOAL WAS TO GAIN INSIGHT INTO THE REACTIONS OCCURRING IN PORTLAND CEMENT-SOIL MIXTURES. SOILS OF THE FREDERICK, IREDELL, AND LLOYD SERIES COMMONLY FOUND IN VIRGINIA WERE INVESTIGATED. THE EFFECT OF THEIR CHEMICAL, MINERALOGICAL, AND ENGINEERING PROPERTIES AND SOIL WEATHERING STAGE ON SUCH PROCESSES AS THE DETERIORATION OF THE SOIL CONSTITUENTS, THE PRODUCTION AND CONSUMPTION OF CALCIUM HYDROXIDE, AND STRENGTH DEVELOPMENT OF THE MIXTURES IS DISCUSSED. INVESTIGATIVE TECHNIQUES USED INCLUDED X-RAY DIFFRACTION AND MICROSCOPIC ANALYSES, AND CHEMICAL ANALYSES OF WATER (FOR CALCIUM) AND HYROCHLORIC ACID (FOR SILICON, ALUMINUM, AND IRON) LEACHATES OF THE MIXTURES. THE FREDERICK SOIL CONSTITUTENTS DID NOT APPRECIABLY REACT WITH THE CEMENT, ALTHOUGH SOME OF THE CLAYS IN THE SOIL WERE SLIGHTLY DETERIORATED AFTER CEMENT TREATMENT. THE CLAYS AND PROBABLY OTHER CONSTITUENTS IN THE B-AND C-HORIZONS OF THE IREDELL AND LLOYD SOILS SUFFERED DETERIORATION AFTER CEMENT TREATMENT, AS INDICATED BY THE RELEASE OF LARGE AMOUNTS OF SILICA AND ALUMINA AND BY THE DIMINUTION OF MINERAL X-RAY PEAKS. WHEN THE MAJOR CLAY MINERAL IN THE SOILS WAS CONSIDERED, THE SOILS SUFFERED DETERIORATION AFTER CEMENT TREATMENT FROM GREATEST TO LEAST IN THE FOLLOWING ORDER: MONTMORILLONITIC SOILS, KAOLINITIC SOILS, ILLITIC SOILS. THE INSTABILITY OF THE C-HORIZON IREDELL SOIL CONSTITUENTS IN A CEMENT SYSTEM APPEARED RELATED TO MINERALOGY. THE MINERALS WERE NOT GREATLY WEATHERED AND WERE SUSCEPTIBLE TO THE HARSH CONDITIONS OF AN ALKALINE ENVIRONMENT. THE GREATEST QUANTITIES OF CALCIUM HYDROXIDE WERE CONSUMED WITH KAOLINITE AS THE DOMINANT CLAY MINERAL. IT APPEARS THAT REACTION OF CALCIUM HYDROXIDE WITH THE SOIL CONSTITUENTS WAS DIRECTLY PROPORTIONAL, AND THE DEVELOPMENT OF STRENGHT WAS INVERSELY PROPORTIONAL, TO THE MAGNITUDE OF THE CLAY-SIZE FRACTION. /AUTHOR/

Paper sponsored by Committee on Cement Stabilization. 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.

01410254

pp 46-63

1970

Highway Research Record

Digital/other

Figures (12) ; References (16) ; Tables (9)

Diffraction; Microscopy; Mineralogy; Portland cement; Properties of materials; Soil cement; Soil horizon; Soils; X rays

Soil properties; X-ray diffraction

Geotechnology; Highways; Materials

TRIS, TRB

Nov 9 1970 12:00AM

• CHANGES IN THE CHARACTERISTICS OF CEMENT-STABILIZED SOILS BY ADDITION OF EXCESS COMPACTION MOISTURE
• CONCEPTS FOR DEVELOPING STABILIZATION RECOMMENDATIONS FOR THE SOILS OF AN AREA
• DIFFERENTIAL THERMAL AND THERMOGRAVIMETRIC ANALYSIS OF REACTED BENTONITE-LIME-WATER MIXTURES
• EFFECTS OF SODIUM CHLORIDE AND SODIUM CHLORIDE-LIME ADMIXTURES ON COHESIVE OKLAHOMA SOILS
• EVALUATION OF REMOLDED FIELD SAMPLES OF LIME-CEMENT-FLY ASH-AGGREGATE MIXTURES
• EXPERIMENTAL STABILIZATION OF PIERRE SHALE
• FACTORS AFFECTING THE TENSILE STRENGTH OF CEMENT-TREATED MATERIALS
• FIELD STUDIES ON THE PULVERIZATION OF BLACK COTTON SOIL FOR THE CONSTRUCTION OF STABILIZED SOIL ROAD BASES
• LIME STABILIZATION OF CLAY-SAND MIXTURES
• USE OF SODIUM CHLORIDE IN REDUCING SHRINKAGE IN MONTMORILLONITIC SOIL-CEMENT