Improvement of early strength of fly ash-slag based one-part alkali activated mortar

Syed Farasat Ali Shah, Bing Chen, Sajjad Yousefi Oderji, M. Aminul Haque, Muhammad Riaz Ahmad

Research output: Journal article publicationJournal articleAcademic researchpeer-review

88 Citations (Scopus)

Abstract

One-part Alkali activated material (AAM) is eco-friendly replacement of OPC with adequate strength and durability characteristics. In this study, the impact of slag content, activator dosage, retarder content and curing temperature was evaluated on fresh and early-age mechanical properties of one-part fly ash/slag-based alkali activated mortar. For assessing the effect of curing temperatures, three temperatures were selected: 20 °C low ambient temperature, 35 °C high ambient temperature and 65 °C replicating heat curing. Consistency, setting time, mix temperature and pH measurements were recorded for fresh mix using standard procedures. In addition, hardened mortar specimens were tested for compressive and flexure strength in conjunction with microstructural characteristics (SEM, XRD, and FTIR analysis). The test results depicted that among all parameters, curing temperature governed the development of early age strength of one-part AAM mortar. Microstructural testing confirmed the enhancement of the geopolymerization reaction through heat curing thus leading to a substantial increase in the early strength.

Original languageEnglish
Article number118533
JournalConstruction and Building Materials
Volume246
DOIs
Publication statusPublished - 20 Jun 2020
Externally publishedYes

Keywords

  • Curing temperature
  • Early-age strength
  • Mechanical properties
  • Microstructure investigation
  • One-part alkali activated material

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • General Materials Science

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