Evaluating Superplasticizer Compatibility in the Production of High Performance Concrete using Portland Pozzolana Cement CEM II/B-P

International Journal of Civil Engineering

© 2020 by SSRG - IJCE Journal

Volume 7 Issue 6

Year of Publication : 2020

Authors : Thomas Omollo Ofwa, David Otieno Koteng, John Nyiro Mwero

10.14445/23488352/IJCE-V7I6P112

How to Cite?

Thomas Omollo Ofwa, David Otieno Koteng, John Nyiro Mwero, "Evaluating Superplasticizer Compatibility in the Production of High Performance Concrete using Portland Pozzolana Cement CEM II/B-P," SSRG International Journal of Civil Engineering, vol. 7,  no. 6, pp. 92-100, 2020. Crossref, https://doi.org/10.14445/23488352/IJCE-V7I6P112

Abstract:

EN CEM II/B-P has potential advantages over CEM I when used to produce concrete. Incorporation of natural pozzolana reduces the amount of clinker used in cement production, hence raw materials, CO2 emission, and energy demand. Moreover, the pozzolana reacts with Ca(OH)2 produced by the hydration of Portland cement thereby mitigating alkali-aggregate reactions, destructive reactions with sulfates and acids, and carbonation shrinkage. In addition, additional C-S-H from the reaction of pozzolana and Ca(OH)2 increases long term strength and densification of the pore structure leading to improved durability. This research explores the effect of selected superplasticizers in the production of free-flowing concrete with CEM II/B-P 32.5N targeting high strength. Cube crushing strength above 60 MPa was obtained at 28 days, together with high initial flowability. However, workability reduced rapidly leading to stiffening within 30 minutes. Such concrete would not allow sufficient time for transportation, placement, and finishing, and therefore has limited application.

Keywords:

High performance, workability retention.

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