INFLUENCE OF TIME BETWEEN MIXING AND COMPACTION ON PROPERTIES OF A LIME-STABILIZED EXPANSIVE CLAY
THE EFFECTIVENESS OF 4% DOLOMITIC HYDRATED LIME AS A STABILIZER FOR AN ORGANIC EXPANSIVE CLAY SOIL HAS BEEN INVESTIGATED. SAMPLES OF TREATED AND UNTREATED SOIL WERE COMPACTED TO 90% OF MAXIMUM DENSITY FOR EACH MIXTURE, AS OBTAINED BY MODIFIED AASHO COMPACTIVE EFFORT, OVER A RANGE OF WATER CONTENTS. THE EFFECTIVENESS OF STABILIZATION WAS MEASURED, IN MOST CASES, BY TRIAXIAL COMPRESSION TESTS AT VARIOUS AGES AFTER COMPACTION FOR BOTH SOAKED AND UNSOAKED SAMPLES. IT WAS FOUND THAT THE TIME INTERVAL BETWEEN MIXING (OF THE SOIL, WATER AND LIME) AND COMPACTION COULD HAVE A PRONOUNCED EFFECT ON THE PROPERTIES OF THE TREATED SOIL. FOR SAMPLES PREPARED USING CONSTANT COMPACTIVE EFFORT, A DELAY OF 24 HR BETWEEN MIXING AND COMPACTION LED TO AS MUCH AS 8% DECREASE IN DENSITY AND 30% DECREASE IN AS-CURED STRENGTH FROM THE VALUES FOR SAMPLES COMPACTED IMMEDIATELY AFTER MIXING. THE EXPANSION AND SOAKED STRENGTH CHARACTERISTICS OF TREATED SAMPLES WERE ALSO ADVERSELY AFFECTED BY A DELAY BETWEEN MIXING AND COMPACTION. THE PRINCIPAL FACTOR RESPONSIBLE FOR THIS BEHAVIOR WAS FOUND TO BE THE DECREASE IN DENSITY (AT CONSTANT COMPACTIVE EFFORT) ACCOMPANYING DELAYS BETWEEN MIXING AND COMPACTION. THE UNSOAKED AND SOAKED STRENGTH AND THE SWELL VALUES FOR SAMPLES COMPACTED IMMEDIATELY AFTER MIXING AND 24 HR AFTER MIXING WERE ESSENTIALLY THE SAME IF THE SAMPLES WERE PREPARED TO THE SAME DENSITY. A 4% LIME TREATMENT WAS FOUND TO BE AN EFFECTIVE STABILIZER OF THE ORGANIC EXPANSIVE CLAY. STRENGTH IMPROVEMENT IN THE AS-CURED SAMPLES WAS NOT GREAT. HOWEVER, THE EFFECTIVENESS OF LIME IN REDUCING THE SWELL OF SAMPLES SOAKED UNDER A SURCHARGE PRESSURE OF 0.1 KG PER SQ CM WAS VERY MARKED AND RESULTED IN SOAKED STRENGTHS OF TREATED SAMPLES UP TO SEVEN TIMES GREATER THAN FOR UNTREATED SAMPLES. PEAK COMPRESSIVE STRENGTH WAS DEVELOPED AT CONSIDERABLY LOWER STRAINS FOR TREATED THAN FOR UNTREATED SAMPLES. A CONSIDERATION OF THE DATA AND THE RESULTS OF CHEMICAL ANALYSES SUGGESTS THAT, FOR THE SOIL STUDIED, THE BENEFICIAL EFFECTS OF LIME TREATMENT ARE CAUSED PRIMARILY BY FLOCCULATION OF THE SOIL STRUCTURE AND A DECREASE IN THE WATER SENSITIVITY OF THE CLAY MINERALS. CEMENTATION EFFECTS ARE BELIEVED TO BE OF MINOR IMPORTANCE IN THIS SOIL. /AUTHOR/
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Supplemental Notes:
- No 304, pp 14-31, 12 FIG, 3 TAB, 6 REF 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
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Authors:
- Mitchell, J K
- Hooper, D R
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Conference:
- 40th Annual Meeting of the Highway Research Board
- Location: Washington DC, United States
- Date: 1961-1-9 to 1961-1-13
- Publication Date: 1961
Language
- English
Media Info
- Monograph Title: Lime stabilization: properties, mix design, construction practices and performance 1961
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Serial:
- Highway Research Board Bulletin
- Issue Number: 304
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Calcium oxide; Chemical analysis; Compaction; Compression; Compressive strength; Density; Expansive clays; Mixing; Soil compaction test; Soil stabilization; Strength of materials; Time
- Uncontrolled Terms: Triaxial compression
- Old TRIS Terms: Compaction tests; Time effects
- Subject Areas: Geotechnology; Highways;
Filing Info
- Accession Number: 00232414
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Aug 15 2004 2:43AM