Effect of binder content on the performance of alkali-activated slag concretes |
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Authors: | Susan A Bernal Ruby Mejía de Gutiérrez Alba L Pedraza John L Provis Erich D Rodriguez Silvio Delvasto |
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Affiliation: | aMaterials Engineering Department, Composite Materials Group, CENM, Universidad del Valle, Cali, Colombia;bDepartment of Chemical and Biomolecular Engineering, University of Melbourne, Victoria 3010, Australia |
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Abstract: | This paper assesses the mechanical and durability performance of concretes produced using alkali silicate-activated ground granulated blast furnace slag as sole binder. Alkali-activated concretes are formulated with 300, 400 and 500 kg slag per m3 of fresh concrete, and their performance is compared with reference concretes produced using Portland cement (OPCC). Regardless of the binder content, the alkali-activated slag concretes (AASC) develop higher compressive strength than the comparable reference concretes. A higher binder content leads to increased strength in both AASC and OPCC at 28 days. However, at 90 days, the performance penalty for low binder content is more significant in the OPCC than AASC samples. Permeability, water sorption and carbonation resistance properties are also improved at higher binder contents. By controlling mix design parameters, it is possible to produce AASC with mechanical strength and durability comparable to conventional Portland cement concretes. |
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Keywords: | Alkali-activated cement (D) Mixture proportioning (A) Mechanical properties (C) Capillary sorptivity Carbonation (C) |
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