Concrete Materials and Structural Integrity Research Unit, Dept. of Civil Eng., Univ. of Cape Town, Private Bag X3, 7701 Rondebosch, South Africa
Githachuri, K., Concrete Materials and Structural Integrity Research Unit, Dept. of Civil Eng., Univ. of Cape Town, Private Bag X3, 7701 Rondebosch, South Africa; Alexander, M.G., Concrete Materials and Structural Integrity Research Unit, Dept. of Civil Eng., Univ. of Cape Town, Private Bag X3, 7701 Rondebosch, South Africa
This paper describes a study on the durability potential and strength of composite Portland-limestone cement (PLC) concrete mixtures blended with ground granulated blast furnace slag (GGBS) and/or fly ash (FA). Their performance was compared against ordinary Portland cement, plain PLC and Portland-slag cement concrete mixtures. Using the South African Durability Index approach, results indicate reductions in the penetrability of the composite PLC blends compared to the other mixtures. The durability indicators are chloride conductivity, gas (oxygen) permeability and water sorptivity. Compressive strength of the composite PLC mixtures containing both GGBS and FA showed competitive performance with the comparative mixtures, but FA blended PLC mixtures had diminished compressive strength values. The paper also presents considerations on the practical implications of using blended PLC concrete mixtures. © 2013 Elsevier Ltd. All rights reserved.
Cement concrete; Competitive performance; Durability performance; Ground granulated blast furnace slag; Limestone cement concretes; Ordinary Portland cement; Strength; Water sorptivity; Blast furnaces; Chlorine compounds; Compressive strength; Durability; Fly ash; Gas permeability; Limestone; Slag cement; Slags; Mixtures