Frost salt scaling resistance of concrete containing CFBC fly ash

The possibility for using coal combustion by-products in concrete exposed to frost-salt aggression was investigated. The research was aimed to assess an influence addition of circulating fluidized bed combustion (CFBC) fly ash on frost-salt scaling of air-entrained concrete. For evaluation of the resistance of concrete to frost salt scaling the test called “depth sensing indentation” (DSI) was applied. The DSI test method was implemented on a universal testing frame using a standard Vickers indenter. Experimental tests were performed on cement paste specimens and concrete specimens designed with partial replacement of cement with coal combustion by-products. The mass of scaled material in standard frost salt scaling resistance tests on concrete was inversely proportional to the Vickers hardness of the paste containing CFBC fly ash; the best-fit arithmetic relationship is provided.

[1]  A. Bilodeau,et al.  Concretes Incorporating High Volumes of ASTM Class F Fly Ashes: Mechanical Properties and Resistance to De-icing Salt Scaling and to Chloride-Ion Penetration , 1992, "SP-132: Fly Ash, Silica Fume, Slag, and Natural Pozzolans and Natural Pozzolans in Concrete - Proceedings Fourth Interna".

[2]  Prabir Basu,et al.  Combustion of coal in circulating fluidized-bed boilers: a review , 1999 .

[3]  J. Havlica,et al.  Properties and use of solid residue from fluidized bed coal combustion , 1996 .

[4]  M. Glinicki,et al.  Depth-sensing indentation method for evaluation of efficiency of secondary cementitious materials , 2004 .

[5]  P. Bartos,et al.  Application of depth-sensing microindentation testing to study of interfacial transition zone in reinforced concrete , 2000 .

[6]  M. Glinicki,et al.  Air void system in concrete containing circulating fluidized bed combustion fly ash , 2008 .

[7]  J. Šimoník,et al.  The compressive strength of samples containing fly ash with high content of calcium sulfate and calcium oxide , 2001 .

[8]  M. Baucus.  Transportation Research Board , 1982 .

[9]  Wojciech Nowak,et al.  Clean coal fluidized-bed technology in Poland , 2003 .

[10]  J. Weiss,et al.  CONCRETE CURING AND ITS RELATIONSHIP TO MEASURED SCALING IN CONCRETE CONTAINING FLY ASH , 2003 .

[11]  J. Elsen,et al.  Determination of the wc ratio of hardened cement paste and concrete samples on thin sections using automated image analysis techniques , 1995 .

[12]  S. Mindess,et al.  Characterization of the microstructure and strength of cement paste by microhardness testing , 1996 .

[13]  S. Mindess,et al.  Microhardness testing of cementitious materials , 1996 .

[14]  M. Pigeon,et al.  Frost resistant concrete , 1996 .

[15]  George W. Scherer,et al.  Mechanism for Salt Scaling , 2006 .