Accession Number : ADA335673

Title :   Quantification of Shape, Angularity, and Surface Texture of Base Course Materials

Descriptive Note : Special rept.

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH

Personal Author(s) : Janoo, Vincent

PDF Url : ADA335673

Report Date : JAN 1998

Pagination or Media Count : 29

Abstract : A state-of-the-art review was conducted to determine existing test methods for characterizing the shape, angularity, and surface texture of coarse aggregates. The review found direct methods used by geologists to determine these characteristics. These methods involve physical measurements of individual aggregates and are very laborious and time consuming. Engineers have developed index tests (indirect methods) to quantify the combined effect of the shape, angularity, and surface texture of coarse aggregates in terms of changes in the voids in the aggregate bulk. A description of both the direct and indirect methods is provided in the report. Also, the effect of shape, angularity, and surface texture of coarse aggregates on the base course performance was reviewed. It was found that there is some contradiction in the published data on resilient modulus. Shape, angularity, and surface texture of coarse aggregates clearly influence the angle of internal friction.

Descriptors :   *SHAPE, *GEOLOGY, *AGGREGATES(MATERIALS), *SURFACE PROPERTIES, *TEXTURE, *INTERNAL FRICTION, TEST AND EVALUATION, ANGLES, PHYSICAL PROPERTIES, TEST METHODS, CONCRETE, PAVEMENTS, GRAVEL, SAND, VOIDS, ROADS, CONSTRUCTION MATERIALS, RESILIENCE, PETROLOGY.

Subject Categories : Laminates and Composite Materials
      Construction Equipment, Materials & Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE