CRITERIA FOR EMULSIFIED ASPHALT STABILIZATION OF SANDY SOILS
In the first phase of the investigation various factors affecting stabilization of sands with emulsion are studied. Well-graded sands with sufficient silt-clay material respond well to emulsions. Portland cement in trace quantities is required, however, to improve the water susceptibility of the mixture. Because of its superior bonding to siliceous aggregate, cationic emulsion is preferred in sand stabilization. Using the test results in five naturally occuring soils and one synthetic aggregate mix design criteria for sands and sandy soils are proposed in the first part of the report. Mixtures which strip or stiffen excessively on mixing may be unsatifactory. In addition, a mixture will be considered suitable if they have a minimum of 50% coating. Minimum Marshall strength of 4225 N (950 lbs) will insure that CETM would not undergo shear failure under heavy truck tire pressure. Another criterion to detect and avoid moisture susceptible mixtures is that Marshall cylinders during vacuum soaking should not absorb more than 8.5% moisture. A third criterion to safeguard against stiff brittle base layer is that seven-day "dry" bearing strength shall not exceed 2760 kPa (400 psi). The first phase of this report concludes with a step-by-step procedure for mix design of CETM. The second part of the report describes the construction of a test pavement employing these criteria. Through the first 21 months, it has performed satistifactorily.
- Sponsored by the Mississippi Highway Department. Research performed in cooperation with the Federal Highway Administration.
University of Mississippi, UniversityDepartment of Civil Engineering
University, MS USA 38677
- George, K P
- Publication Date: 1978-12
- Pagination: 102 p.
- TRT Terms: Design; Emulsified asphalt; Experimental roads; Moisture content; Sandy soils; Shear strength; Soil stabilization
- Uncontrolled Terms: Design criteria; Molasses; Susceptibility
- Subject Areas: Design; Geotechnology; Highways;
- Accession Number: 00195891
- Record Type: Publication
- Source Agency: Federal Highway Administration
- Report/Paper Numbers: FHWA-MD-79-062-F Final Rpt.
- Files: TRIS, USDOT
- Created Date: Aug 28 1979 12:00AM