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Durability assessment of alkali activated slag (AAS) concrete

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Abstract

The environmental impact from the production of cement has prompted research into the development of concretes using 100% replacement materials activated by alkali solutions. This paper reports research into the durability of AAS concrete. The durability properties of AAS have been studied for a range of sodium oxide dosages and activator modulus. Properties investigated have included measurements of workability, compressive strength, water sorptivity, depth of carbonation and rapid chloride permeability. Microstructure studies have been conducted using scanning electron microscopy and energy dispersive X-ray spectroscopy. It was concluded that an activator modulus of between 1.0 and 1.25 was identified as providing the optimum performance for a sodium oxide dosage of 5% and that AAS concretes can exhibit comparable strength to concrete currently produced using Portland cement (PC) and blended cements. However, with regards to the durability properties such as water sorptivity, chloride and carbonation resistance; the AAS concretes exhibited lower durability properties than PC and blended concretes. This, in part, can be attributed to surface microcracking in the AAS concretes.

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Authors and Affiliations

  1. School of Civil Environmental and Chemical Engineering, RMIT University, Melbourne, 3001, Australia

    David W. Law, Thomas K. Molyneaux & Indubhushan Patnaikuni

  2. Department of Civil Engineering, Tadulako University, Palu, Indonesia

    Andi Arham Adam

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  1. David W. Law
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  2. Andi Arham Adam
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  3. Thomas K. Molyneaux
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  4. Indubhushan Patnaikuni
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Correspondence to David W. Law.

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Law, D.W., Adam, A.A., Molyneaux, T.K. et al. Durability assessment of alkali activated slag (AAS) concrete. Mater Struct 45, 1425–1437 (2012). https://doi.org/10.1617/s11527-012-9842-1

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