Accession Number : AD0428476


Title :   EFFECT OF HEAVY MEDIA PROCESSING OF AGGREGATE ON FREEZING AND THAWING RESISTANCE OF CONCRETE FONTENELLE DAM,


Corporate Author : BUREAU OF RECLAMATION DENVER COLO


Personal Author(s) : Briggs,G O


Report Date : 30 Dec 1963


Pagination or Media Count : 18


Abstract : This report summarizes results of laboratory tests conducted on concretes containing aggregates from the vicinity of and proposed for use in Fontenelle Dam structures. The investigation described was initiated after preliminary aggregate acceptance tests indicated early surface deterioration in the form of popouts, coarse aggregate failures, and surface scaling of concrete containing this aggregate when exposed to freezing and thawing action. Concretes containing normally processed and heavy media beneficiated aggregates, and with variable watercement ratios were tested. Results indicate that heavy media beneficiation improves the quality of Fontenelle aggregate by eliminating the lightweight constituents, and slightly benefits the durability of concrete containing this aggregate. Also reduction of water-cement ratio is beneficial to the freeze-thaw resistance of concrete regardless of cure. Petrographic Report No. 61-32, included as Appendix A, covers studies to determine the suitability of heavy media separation for beneficiating this aggregate. Details and conclusions regarding this phase of the investigations are included therein. (Author)


Descriptors :   *PETROLOGY , FREEZING , CONCRETE , PARTICLES , STRUCTURAL PROPERTIES , CEMENTS , LIQUIDS , SEPARATION , BROMINE COMPOUNDS , ALKANES , QUALITY CONTROL , PROCESSING , DAMS


Distribution Statement : APPROVED FOR PUBLIC RELEASE