Roller Compacted High Fly Ash Concrete (Geocrete)


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Title: Roller Compacted High Fly Ash Concrete (Geocrete)

Author(s): R.C. Joshi and G.S. Natt

Publication: Special Publication

Volume: 79


Appears on pages(s): 347-366

Keywords: blended cements; compacting; compressive strength; concrete durability; concretes; flexural strength; fly ash; lime fly ash; stabilization.

Date: 5/1/1983

Use of sub-bituminous, 'C' fly ashes from Alberta, a province in Western Canada, for producing high fly ash roller compactable concrete or geocrete was investigated. Optimum moisture content and maximum density of each of the mix containing sand and gravel as coarse and fine aggregates respectively, and mixtures of fly ash and cement, and fly ash and lime as cementitious materials were evaluated by geotechnical methods. Compaction and strength characteristics of the mixes containing various proportions of aggregate and cementitious material were evaluated in the labora-tory. Durability characteristics and flexure strength of the selected mixes were also studied. The results indicate that the two subbituminous fly ashes, from Western Canada, can be used to produce high fly ash concrete suitable for pavements and core of gravity dams.