Investigation on the Rheological Behavior of Fly Ash Cement Composites at Paste and Concrete Level

  • Hemalatha Thiyagarajan
  • Maitri Mapa
  • Rakhi Kushwaha
Original Contribution
  • 35 Downloads

Abstract

Towards developing sustainable concrete, nowadays, high volume replacement of cement with fly ash (FA) is more common. Though the replacement of fly ash at 20–30% is widely accepted due to its advantages at both fresh and hardened states, applicability and acceptability of high volume fly ash (HVFA) is not so popular due to some adverse effects on concrete properties. Nowadays to suit various applications, flowing concretes such as self compacting concrete is often used. In such cases, implications of usage of HVFA on fresh properties are required to be investigated. Further, when FA replacement is beyond 40% in cement, it results in the reduction of strength and in order to overcome this drawback, additions such as nano calcium carbonate (CC), lime sludge (LS), carbon nano tubes (CNT) etc. are often incorporated to HVFA concrete. Hence, in this study, firstly, the influence of replacement level of 20–80% FA on rheological property is studied for both cement and concrete. Secondly, the influence of additions such as LS, CC and CNT on rheological parameters are discussed. It is found that the increased FA content improved the flowability in paste as well as in concrete. In paste, the physical properties such as size and shape of fly ash is the reason for increased flowability whereas in concrete, the paste volume contributes dominantly for the flowability rather than the effect due to individual FA particle. Reduced density of FA increases the paste volume in FA concrete thus reducing the interparticle friction by completely coating the coarse aggregate.

Keywords

High volume fly ash Rheology Viscosity Yield stress 

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Copyright information

© The Institution of Engineers (India) 2018

Authors and Affiliations

  • Hemalatha Thiyagarajan
    • 1
  • Maitri Mapa
    • 1
  • Rakhi Kushwaha
    • 1
  1. 1.CSIR-Structural Engineering Research CentreChennaiIndia

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