Accession Number:

ADA235656

Title:

The Effects of Natural Sands on Asphalt Concrete Engineering Properties.

Descriptive Note:

Final rept.,

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB

Personal Author(s):

Report Date:

1991-03-01

Pagination or Media Count:

173.0

Abstract:

Asphalt concrete rutting is premature deformation that develops in wheelpaths under channelized loads. Asphalt concrete mixtures that exhibit plastic flow are caused by asphalt concrete mixtures that have an excessive asphalt content andor excessive amount of uncrushed rounded aggregate. This laboratory study was conducted to evaluate the effects of natural sands on the elasticplastic properties of asphalt concrete. This research consisted of a literature review and a two-phase laboratory study of laboratory-produced specimens. Conventional and state-of-the-art testing procedures including indirect tensile, resilient modulus, and unconfined creep rebound were used to determine the effects of natural sands. The conclusions of the laboratory study indicated that use of natural sand materials decreased strength characteristics of asphalt concrete mixtures. Replacing natural sand materials with crushed aggregates increased the resistance to permanent deformation. This study recommends that the maximum limit for natural sand be 15 percent, but to maximize the decrease in rutting potential, all crushed aggregate should be used.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE