BENEFICIATION OF AGGREGATES

UPGRADING TESTS ARE CONDUCTED ON SUBSTANDARD MATERIALS OF EASTERN MONTANA FOR USE AS ROADBUILDING AGGREGATE. THE BULK OF THE TESTING WAS DEVOTED TO THE STABILIZATION OF SAND /DECOMPOSED SANDSTONE/ WITH ASPHALT AND PORTLANT CEMENT. FIVE TO SEVEN PERCENT CEMENT TREATMENT ADEQUATELY STABILIZED THE DECOMPOSED SANDSTONE FOR BASE COURSE, WHILE NINE PERCENT CEMENT WAS REQUIRED TO STABILIZE A CLEAN STREAM SAND. NO DEFINITE CONCLUSION CONCERNING THE FEASIBILITY OF ASPHALT STABILIZATION WAS MADE BECAUSE OF ERRATIC TEST RESULTS. THE MOST PRACTICAL USE FOR THESE SANDS IS FOR SUBBASE WHERE THE SUBGRADE IS EXPANSIVE SHALE OR CLAY, PROVIDED THAT THE SAND IS PROTECTED FROM EROSION AND EXTREME MOISTURE CHANGES. SAND-ASPHALT AND BAKED SHALE-SAND-ASPHALT MIXTURES WERE TESTED TO DETERMINE THEIR SUITABILITY AS SURFACING MATERIALS. SAND-ASPHALT MIXTURES WERE UNSUITABLE FOR SURFACING, WHILE SOME BAKED SHALE-SAND-ASPHALT MIXTURES WERE ACCEPTABLE. /BPR/

• Corporate Authors:

  Montana State Highway Commission

  ,    
• Publication Date: 1966

Subject/Index Terms

• TRT Terms: Aggregates; Asphalt; Beneficiation; Expansive clays; Portland cement; Sand; Shale; Soil stabilization; Subbase (Pavements); Subgrade materials; Surface course (Pavements); Testing
• Uncontrolled Terms: Subbase
• Old TRIS Terms: Sand stabilization
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00217465
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Report/Paper Numbers: Hpr-1/3/
• Files: TRIS
• Created Date: May 25 1994 12:00AM