ROLE OF MGO IN SOIL-LIME STABILIZATION

PREVIOUS TEST RESULTS HAVE SHOWN THAT THE HIGH CALCIUM VARIETY OF HYDRATED LIME IS MOST EFFECTIVE FOR MODIFYING SOIL PLASTICITY, BUT AT NORMAL CURING TEMPERATURES THE DOLOMITIC MONOHYDRATE, CA/OH/2 PLUS MGO, IS BEST FOR PRODUCING STRENGTH. THREE SERIES OF SAMPLES WERE PREPARED, WETTED, SEALED AND CURED FOR VARIOUS TIMES AT SEVERAL TEMPERATURES, AND ANALYZED BY X-RAY DIFFRACTION' CA/OH/2 PLUS BENTONITE, C/S VARIABLE, CA/OH/2 PLUS MGO PLUS BENTONITE, C/M VARIABLE FROM O TO INFINITY, /C PLUS M/S BEING 0.892, AND CA/OH/2 PLUS MGO PLUS BENTONITE, C/M EQUAL TO 1, /C PLUS M/S BEING VARIABLE. TO CHECK THE RESULTING HYPOTHESES REGARDING CEMENTATION, VARIOUS LIME PLUS SAND SAMPLES WERE THEN MOLDED, CURED IN CO2-FREE CONDITIONS, AND TESTED FOR UNCONFINED COMPRESSIVE STRENGTH. RESULTS INDICATE THAT THE ESSENTIAL ROLE OF MGO IS TO FORM MG/OH/2 CEMENT. AT ROOM TEMPERATURE THIS REACTION PROCEEDS FASTER THAN THE POZZOLANIC REACTIONS WITH CA/OH/2, HENCE MONOHYDRATE DOLOMITIC LIME MAY BE USED TO ADVANTAGE IN COOL CLIMATES OR LATE IN THE CONSTRUCTION SEASON. HIGHER TEMPERATURES /40C/ ACCELERATE POZZOLANIC REACTIONS AND MASK CEMENTATION EFFECTS OF THE MGO. IDENTIFIED REACTION PRODUCTS INCLUDE THE CSH AND C4AH13 GROUPS AND HYDROGARNET. SERPENTINE IN BOTH FIBROUS /ASBESTOS/ AND PLATY FORMS WAS FOUND IN MIXES OF BENTONITE WITH MGO ALONE. AT HIGH AUTOCLAVE TEMPERATURES APPRECIABLE MGO APPEARS TO ENTER INTO POZZOLANIC REACTION. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/sr/sr90/90-039.pdf
• Supplemental Notes:
  • 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
• Corporate Authors:

  Highway Research Board (HRB)

  Washington, DC   
• Authors:
  • Wang, Jerry W H
  • Handy, R L
• Publication Date: 1966

Media Info

• Media Type: Print
• Features: Figures; Photos; References; Tables;
• Pagination: pp 475-492
• Monograph Title: Symposium on structure of Portland cement paste and concrete
• Serial:
  • Highway Research Board Special Report
  • Issue Number: 90
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Bentonite; Bonding; Calcium compounds; Calcium hydroxide; Compression tests; Diffraction; Hydroxides; Hypothesis testing; Magnesium compounds; Oxides; Pozzolanic action; Reaction time; Samples; Soil cement; Soil cement tests; Soil stabilization; Temperature; Testing; X rays
• Uncontrolled Terms: Hypothesis; X-ray diffraction
• Old TRIS Terms: Compressive strength tests; Unconfined compression tests
• Subject Areas: Data and Information Technology; Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00212458
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jan 9 1994 12:00AM