PERFORMANCE CHARACTERISTICS OF CEMENT-MODIFIED ASPAHLT EMULSION MIXES
This study which explores the use of lime and cement in emulsion-treated mixes (ETM), includes an investigation of the effect of water, asphalt hardness, and aggregate type on the resilient modulus (M sub R) and on fatigue behavior. A field test (described) confirmed laboratory findings. The procedure is described and results are detailed of experimentation in which ETM and cement-emulsion treated mixes (C-ETM) were made from Cache Creek aggregate, gradation I, containing 5 percent residual aspahlt from SS-type emulsions. The study showed that asphalt ETM develop resilient modulus on curing that varies directly as the hardness of the asphalt used to make the emulsion. Ambient temperature air-cured ETM attain M sub R higher than that of hot mixes made with the same asphalt. However, ETM water resistance is lower-than ATM until the ETM has fully cured. On re-drying, the M sub R of water soaked ETM is fully recovered. Cement (1.3 percent) modified ETM (C-ETM), rapidly develop high M sub R which also varies with the hardness of the asphalt; these C-ETM are resistant to water damage. Higher levels of cement cause greater changes in M sub R. The beneficial effect of cement on ETM occurs with a widely used gravel as well as with a pure limestone and a pure quartz aggregate. Cores taken from a field test demonstrating practicality of C-ETM, confirm the rapid field development of M sub R. Because of the exceptionally high M sub R developed by the C-ETM, the pavement thickness required for equal fatigue life (according to the elastic design method) shows that hot mixes (ATM) and C-ETM (1.3 percent cement) are about equally effective.
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Supplemental Notes:
- Proceedings of the meeting held in Houston, Texas, February 1973.
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Corporate Authors:
University of Minnesota, Minneapolis
155 Experimental Engineering Building
Minneapolis, MN United States 55455 -
Authors:
- Schmidt, R J
- Santucci, L E
- Coyne, L D
- Conference:
- Publication Date: 1973
Media Info
- Features: Figures; References; Tables;
- Pagination: p. 300-319
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Serial:
- Volume: 42
Subject/Index Terms
- TRT Terms: Aggregates; Asphalt mixtures; Cement; Emulsified asphalt; Fatigue (Mechanics); Field tests; Gravel; Hardness; Hot mix asphalt; Laboratory tests; Limestone; Pavements; Performance; Quartz; Resilience (Materials); Temperature; Thickness; Water
- Uncontrolled Terms: Fatigue life; Pavement thickness
- Old TRIS Terms: Cement modifications
- Subject Areas: Geotechnology; Highways; Materials; Pavements;
Filing Info
- Accession Number: 00127333
- Record Type: Publication
- Files: TRIS
- Created Date: Dec 16 1975 12:00AM