Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Fly Ash Concrete for Highway Use. Executive Summary
A series of investigations were carried out to examine the potential for routine use of fly ash in highway concrete, with special reference to Indiana. Existing methods of mix proportioning of fly ash concretes were reviewed in detail, and a new method developed to better assure good durability characteristics despite expected fluctuations in fly ash properties. Extensive investigations were carried out on the properties of concretes designed by the method and using representative Indiana fly ashes of both Class F and Class C varieties. In general these concretes exhibited compressive strengths and other mechanical properties at least as satisfactory as those of presently specified plain portland cement concretes, and the potential durability appeared to be significantly improved. The development of early flexural strengths was found to lag those of plain concretes somewhat, but after several months the lag disappeared. Provision of an adequate air content is necessary to assure freeze-thaw durability, and it was found that the necessary dosage of air entraining agent varied with the fly ash, but could be determined very easily by use of the foam index test.
Fly Ash Concrete for Highway Use. Executive Summary
A series of investigations were carried out to examine the potential for routine use of fly ash in highway concrete, with special reference to Indiana. Existing methods of mix proportioning of fly ash concretes were reviewed in detail, and a new method developed to better assure good durability characteristics despite expected fluctuations in fly ash properties. Extensive investigations were carried out on the properties of concretes designed by the method and using representative Indiana fly ashes of both Class F and Class C varieties. In general these concretes exhibited compressive strengths and other mechanical properties at least as satisfactory as those of presently specified plain portland cement concretes, and the potential durability appeared to be significantly improved. The development of early flexural strengths was found to lag those of plain concretes somewhat, but after several months the lag disappeared. Provision of an adequate air content is necessary to assure freeze-thaw durability, and it was found that the necessary dosage of air entraining agent varied with the fly ash, but could be determined very easily by use of the foam index test.
Fly Ash Concrete for Highway Use. Executive Summary
S. Diamond (Autor:in) / J. Olek (Autor:in)
1988
20 pages
Report
Keine Angabe
Englisch