SUITABILITY OF SYNTHETIC AGGREGATES MADE FROM CLAY-TYPE SOILS FOR USE IN FLEXIBLE BASE

AN INVESTIGATION WAS UNDERTAKEN TO DETERMINE THE LIMITING RANGES OF NATURAL SOILS WHICH CAN BE FIRED TO PRODUCE AGGREGATES SUITABLE FOR USE IN FLEXIBLE BASE MATERIALS. THE CLAY MINERALS, MONTMORILLONITE, ILLITE, KAOLINITE WILL NOT REHYDRATE UNDER ATMOSPHERIC CONDITIONS ONCE THEY HAVE BEEN COMPLETELY DEHYDRATED (DEHYDROXYLATED). THEREFORE, ONCE THEY HAVE BEEN COMPLETELY DEHYDRATED, THEY BECOME CHEMICALLY STABILIZED FOR USE AS HIGHWAY CONSTRUCTION MATERIALS. INCOMPLETE DEHYDRATION OF AGGREGATES MADE BY DEHYDRATING CLAY-TYPE SOILS CAN BE DETECTED BY A RELATIVELY SIMPLE LABORATORY TEST. MOST (IF NOT ALL) CLAY-TYPE SOILS HAVING A RELATIVELY HIGH STRENGTH WHEN AIR DRIED CAN BE FIRED TO PRODUCE HARD, DURABLE AGGREGATES SUITABLE FOR USE IN FLEXIBLE BASE AND ASPHALTIC CONCRETE. IT IS FELT THAT SYNTHETIC AGGREGATES PRODUCE FROM SOILS THAT ARE SUITABLE FOR FLEXIBLE BASE AND ASPHALTIC CONCRETE WILL ALSO, IN MANY CASES, BE SUITABLE FOR USE AS PORTLAND CEMENT CONCRETE AGGREGATES. HOWEVER, IT SHOULD BE NOTED THAT THERE ARE MANY CHEMICAL COMPOUNDS PRESENT IN SYNTHETIC AGGREGATES PRODUCED FROM NATURALLY OCCURRING SOILS. SOME OF THESE COMPOUNDS, THOUGH NOT DETRIMENTAL IN FLEXIBLE BASE OR ASPHALTIC CONCRETE APPLICATIONS, MAY ADVERSELY AFFECT THE HYDRATION OF PORTLAND CEMENT CONCRETE. /AUTHOR/

• Supplemental Notes:
  • Research RePT 81-5, 21 PP
• Corporate Authors:

  Texas Transportation Institute

  Texas A&M University System, 1600 E Lamar Boulevard
  Arlington, TX  United States  76011
• Authors:
  • Moore, W M
  • Van, PELT RS
  • Scrivner, F H
  • Kunze, C W
• Publication Date: 1968-2

Subject/Index Terms

• TRT Terms: Air dried soil; Artificial aggregates; Asphalt concrete; Atmosphere; Chemical compounds; Clay minerals; Concrete aggregates; Drying; Durability; Flexible pavements; Illites; Kaolinite; Laboratory tests; Montmorillonite; Portland cement concrete; Road construction; Soil stabilization; Soils; Strength of materials
• Uncontrolled Terms: Dehydration; Stabilization
• Old TRIS Terms: Flexible base pavements
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00217594
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 8 1994 12:00AM