Compacted Non Cement Concrete Utilizing Fluidized Bed And Pulverized Coal Combustion By-Products

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Title: Compacted Non Cement Concrete Utilizing Fluidized Bed And Pulverized Coal Combustion By-Products

Author(s): Nader Ghafoori and Cesar A. Garcia M.

Publication: Materials Journal

Volume: 95

Issue: 5

Appears on pages(s): 582-592

Keywords: abrasion; compression; elastic modulus; expansion; fluidized bed; freezing and thawing; pulverized coal combustion; roller-compacted concrete; splitting tension; sulfate;

DOI: 10.14359/400

Date: 9/1/1998

Abstract:
The engineering Characteristics and long-term durability of laboratory-made compacted non-cement composites made with FBC spent bed and PCC fly ash, by-products of fluidized bed and pulverized coal combustion processes, respectively, natural siliceous fine aggregate, and crushed limestone coarse aggregate, are investigated. The concrete constituents are combined and fabricated, at their optimum moisture content, in accordance with the requirements of ASTM D 1557. Once cured, the engineering characteristics of hardened specimens were assessed at different curing ages, up to 18 months, under both sealed and saturated conditions. The PCC/FBC impact compacted non-cement concretes are studied for unconfined compressive and indirect tensile strengths; static modulus of elasticity; and resistance to internal sulfate attack, abrasion wear, and freezing and thawing. Laboratory test results conclude that higher strength and expansion properties, and an increased performance in 1ong-term durability are attained with increases in PCC fly ash to FBC spent bed ratio of the matrix. The inclusion of natural fine aggregate improves paste quality and properties of PCC/FBC compacted concretes. Under saturated conditions, the engineering and long-term characteristics of the selected mixtures are inferior to those obtained under sealed conditions.


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