Accession Number:

AD0783460

Title:

Investigation of Shotcrete.

Descriptive Note:

Final technical rept. Jun 68-Jun 71,

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Report Date:

1974-07-01

Pagination or Media Count:

59.0

Abstract:

Two processes for pneumatic application of concrete shotcreting, the wet and dry, both with fine and coarse aggregate, were investigated. Specimens cored from panels of the pneumatically applied concrete were tested to determine such physical properties as compressive strength, tensile strength, shear strength, permeability, bond pullout resistance of steel, density, absorption, unit weight, and resistance to freezing and thawing. Panels were also tested to determine the adhesion of the shotcrete to the rough and smooth surfaces of concrete, the rough and smooth surfaces of old shotcrete, and the smooth surfaces of old concrete and old shotcrete painted with epoxy. Test results indicated that a direct tension test is the best method for evaluating the bond strength and the uniformity of shotcrete. Bonding shotcrete to old concrete or old shotcrete can be accomplished using epoxy. Results of individual tests of the shotcrete varied more than results of individual tests of conventional concrete. Modified author abstract

Subject Categories:

  • Construction Equipment, Materials and Supplies

Distribution Statement:

APPROVED FOR PUBLIC RELEASE