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Journal of Polymer & Composites Original Research Special issue

Experimental Investigation on Strength and Durability Properties of Slag Based Alkali Activated Concrete Incorporating Fly Ash

  1. Shashwati Soumay Pradhan Department of Civil Engineering, National Institute of Technology, Agartala
  2. Umesh Mishra Department of Civil Engineering, National Institute of Technology, Agartala
  3. Sushant Kumar Biswal Department of Civil Engineering, National Institute of Technology, Agartala

Abstract

To minimize carbon emissions during cement production and to resolve landfill issues arising from industrial waste, the adoption of alkali-activated concrete (AAC) incorporating various by-products from industry has become increasingly popular as environmentally friendly option to conventional concrete in the construction sector. This study focused on strength and durability of AAC by utilizing waste industrial by-products such as ground granulated blast furnace slag (GGBS) and fly ash (FA) at ambient temperature. The amount of FA used to partially replace GGBS ranged from 5% to 30% in AAC. The compressive strength and durability parameters were evaluated, including sorptivity, depth of carbonation, rapid chloride penetration and acid (H2SO4) attack. Compressive strength is progressively decreased when FA content is raised, but strength is increased when curing time is extended. The lower FA substitution in slag based AAC shows higher resistance to absorption in sorptivity. The depth of carbonation was evaluated after 90 days. Due to the prolonged curing period, the chloride ion penetration was improved. As the amount of FA in the mixture increases, the acid resistance of slag-FA based AAC is improved. Hence, using lower FA substitution perform better than those with higher FA substitution in GGBS based AAC.

Keywords

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