High volume fly ash concrete: The practical impact of using superabundant dose of high range water reducer

Hafiz A. Alaka, Lukumon O. Oyedele

Research output: Contribution to journalArticle

13 Citations (Scopus)
20 Downloads (Pure)

Abstract

The practice of using extraordinarily low water/binder ratio for high volume fly ash (HVFA) concrete mixes in order to realize adequate early strength is prevalent. Generally, superabundant dose of high range water reducer (i.e. superplasticizer) is required to make such mixes workable. The relationship between superabundant superplasticizer dose and various HVFA concrete properties is thus examined in this research work. Three groups of HVFA concrete mixes were designed for this purpose. Each group consisted of 3 mixes. Except for superplasticizer dose, the proportion of materials in the three group 1 mixes were the same, each mix containing 50% fly ash as replacement for cement. Of the three mixes, one contained maximum superplasticizer dose at 2% of binder by mass, the second contained superabundant dose at 3% while the third contained 4% dose. Group 2 and 3 mixes were similar to those of group 1 except that they contained 60% and 65% fly ash content respectively. Fresh concrete tests performed on the mixes included flow table and slump tests. Mechanical tests included compressive strength, splitting tensile strength, flexural strength and wear resistance tests. The outcome of the tests revealed that superabundant superplasticizer doses helped to obtain relatively lower water/binder ratios with good workability; led to reduction in wear/abrasion resistance; and had no observable relationship, beneficial or adverse, with the compressive, splitting tensile and flexural strengths of the HVFA concrete mixes. Increase in fly ash content was also noted to beget reduction in wear/abrasion resistance. In addition, the outcome indicated that increase in compressive strength does not necessarily translate to improved abrasion or wear resistance.

Original languageEnglish
Pages (from-to)81-90
Number of pages10
JournalJournal of Building Engineering
Volume8
Early online date30 Sep 2016
DOIs
Publication statusPublished - 1 Dec 2016
Externally publishedYes

Fingerprint

Fly ash
Concretes
Wear resistance
Concrete mixtures
Water
Binders
Bending strength
Compressive strength
Tensile strength
Wear of materials
Cements

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Building Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Building Engineering, [5, (2016)] DOI: 10.1016/j.jobe.2016.09.008

© 2016, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Abrasion/wear resistance
  • Compressive strength
  • Flexural strength
  • High volume fly ash concrete
  • Splitting tensile strength
  • Superplasticizer dose

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Safety, Risk, Reliability and Quality
  • Mechanics of Materials

Cite this

High volume fly ash concrete : The practical impact of using superabundant dose of high range water reducer. / Alaka, Hafiz A.; Oyedele, Lukumon O.

In: Journal of Building Engineering, Vol. 8, 01.12.2016, p. 81-90.

Research output: Contribution to journalArticle

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