Use of Dry Bottom Ash as a Fine Aggregate in Roller Compacted Concrete

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Title: Use of Dry Bottom Ash as a Fine Aggregate in Roller Compacted Concrete

Author(s): N. Ghafoori, Y. Cai and B. Ahmadi

Publication: Special Publication

Volume: 171

Issue:

Appears on pages(s): 487-506

Keywords: Abrasion; compacting; compression; drying shrinkage; freeze thaw durability; modulus of elasticity; pavements; tension.

Date: 8/1/1997

Abstract:
Tests were carried out on a series of laboratory-made roller compacted concretes (RCC) containing high-calcium dry bottom ash as a fine aggregate. Concrete specimens of 6 different proportions (cement factors of 188 to 337 kg/m3 and coarse aggregate contents of 1042 to 1349 kg/m3) were prepared at their optimum moisture content and fabricated in accordance with the requirements of ASTM C 1170, Procedure A. The RCC samples were moist-cured under different ages and tested for compression, splitting-tension, flexure, modulus of elasticity, drying shrinkage, and resistance to abrasion and rapid freezing and thawing. From the data produced in this investigation, it is concluded that good strength, stiffness, drying shrinkage, and resistance to wear and repeated freezing and thawing cycles can be obtained with compacted concretes containing bottom ash of dry coal combustion process. Assuming that the laboratory procedure adopted for specimen fabrication is representative of RCC construction, high-calcium dry bottom ash can be used effectively, as a fine aggregate, in pavement applications.