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Alkali-activated aerated blends: interaction effect of slag with low and high calcium fly ash

  • SPECIAL FEATURE: ORIGINAL ARTICLE
  • Material Cycles in Construction Works
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Abstract

This paper reports the influence of the addition of slag in a fly ash-based alkali-activated aerated system, using both Class-F and Class-C fly ash. The factors considered in this study are dosage of aluminium powder as an aerating agent, dosage of slag as co-binder, the molarity of NaOH as an alkaline activator and curing temperature. The incorporation of ground granulated blast furnace slag (GGBS) as secondary binder affects the fresh properties like aeration rate, setting time and flow which can be related to the microstructural development and mechanical properties at later ages. Interestingly, AAM with a binary blend of Class-F fly ash and slag results in higher strength to density ratio., i.e. for a dry density of 1000–1200 kg/m3, a compressive strength value of 20–25 MPa can be achieved with this binary blend combination of aerated concrete.

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Acknowledgements

The authors acknowledge the support received from Institute of Eminence Research Initiative Project on Technologies for Low-Carbon Lean-Construction (TLC2), IIT Madras. P.P. gratefully acknowledges the Pre-Doctoral Fellowship funding received from IIT Madras.

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Author notes

  1. Priyadharshini Perumal

    Present address: Marie-Curie Fellow, Fibre and Particle Engineering Research Unit, Faculty of Technology, University of Oulu, Oulu, Finland

Authors and Affiliations

  1. Building Technology and Construction Management Division, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, 600036, India

    E. Muthu Kumar

  2. Building Technology and Construction Management Division, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, India

    Priyadharshini Perumal

  3. Surendra and Dorothie Shah Chair, Building Technology and Construction Management Division, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, 600036, India

    K. Ramamurthy

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  1. E. Muthu Kumar
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Correspondence to K. Ramamurthy.

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Kumar, E.M., Perumal, P. & Ramamurthy, K. Alkali-activated aerated blends: interaction effect of slag with low and high calcium fly ash. J Mater Cycles Waste Manag 24, 1378–1395 (2022). https://doi.org/10.1007/s10163-022-01434-5

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