00231336

Component

http://onlinepubs.trb.org...rbbulletin/183/183-002.pdf

THE STRENGTH OF AN ARTIFICALLY CEMENTED SOIL MASS, SUCH AS SOIL-CEMENT OR SOIL-LIME-FLYASH, IS THEORETICALLY HIGHLY DEPENDENT ON THE INTIMACY OF GRAIN-TO-GRAIN CONTACT. THE CONTROLLING FACTOR HERE SHOULD BE DEGREE OF COMPACTION. WITH THIS IN MIND, VARIOUS SOIL-LIME-FLYASH MIXES WERE COMPACTED AT FOUR DIFFERENT CONTROLLED DENSITIES AND THE SPECIMENS WERE MOIST CURED AT NORMAL TEMPERATURE AND TESTED. THREE SOILS WERE USED: AN IOWA SILT (LOESS), A KANSAS DUNE SAND, AND A TEXAS COASTAL PLAIN CLAY. THE LIME WAS CALCITIC (HIGH CALCIUM) HYDRATED LIME. MIXES WERE PREPARED WITH 25 PERCENT LIME-FLYASH AND WITH DIFFERENT RATIOS OF LIME TO FLYASH. SPECIMENS WERE SOAKED IN WATER AND TESTED AFTER 7 AND 28 DAYS. EVALUATION OF THE COMPRESSIVE STRENGTH DATA SHOWS THAT DENSITY IS INDEED A HIGHLY IMPORTANT VARIABLE. COMPACTION TO ABOVE STANDARD PROCTOR DENSITY INCREASED 7-DAY STRENGTHS ON THE AVERAGE 100 PERCENT AND 28 DAY STRENGTHS, 70 PERCENT. A HIGHER COMPACTION TO MODIFIED PROCTOR DENSITY RAISED THE AVERAGE INCREASES TO 120 AND 110 PERCENT. COMPACTION TO A SUPER-MODIFIED PROCTOR INCREASED THE AVERAGES TO 150 AND 130 PERCENT OVER STRENGTHS PREVIOUSLY REALIZED AT STANDARD PROCTOR DENSITY. IT IS CONCLUDED THAT DENSITY IS NOT ONLY IMPORTANT BUT THAT IT MAY ALSO BE AN ECONOMICAL CONSIDERATION IN DESIGN. THE SILT ALSO SHOWED INFLUENCE FROM OVER-COMPACTION, BUT THE INFLUENCE VANISHED ON 28-DAY CURING. THE CLAY GAVE THE BEST RESPONSE TO INCREASED COMPACTION, AND STRENGTHS WITH MODIFIED PROCTOR DENSITY WERE APPROXIMATELY THREE TIMES THOSE OBTAINED AT STANDARD PROCTOR. WITH MODIFIED DENSITY ALL SOILS SHOWED 28-DAY STRENGTHS OF THE ORDER OF 600 TO 1,000 PSI WITH ORDINARY ROOM TEMPERATURE MOIST CURING. ATTENDANT WITH THIS INVESTIGATION WAS AN EVALUATION OF AN OPTIMUM LIME-FLYASH RATIO. WITH MOST SOILS THE RATIO WAS NOT CRITICAL, BUT HIGHEST STRENGTHS WERE REALIZED WITH A LIME-FLYASH RATIO OF 1:9 OR 2:8. A RATIO OF 1:9 WAS NEARLY A UNIVERSAL OPTIMUM FOR ALL THREE SOILS REGARDLESS OF COMPACTIVE EFFORT. /AUTHOR/

No 183, pp 5-15, 8 FIG, 5 TAB, 3 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

01408188

English

1958

Highway Research Board Bulletin

Calcium hydroxide; Clay; Compaction; Compressive strength; Lime fly ash; Loess; Sand; Soil cement; Soil compaction; Soil compaction test; Soil densification; Soil stabilization

Proctor compaction test

Geotechnology; Highways

TRIS, TRB

Aug 15 2004 2:41AM

• EXPANDED SHALE AS AN ADMIXTURE IN LIME STABILIZATION
• IMPROVEMENT OF STRENGTH OF SOIL-CEMENT WITH ADDITIVES
• SALT STABILIZATION ON OHIO'S SECONDARY SYSTEM
• THE STRENGTH CHARACTERISTICS OF SOIL-AGGREGATE MIXTURES & DISCUSSION