Effect of GGBS and curing temperature on microstructure characteristics of lightweight geopolymer concrete

Hilal El-Hassan, Najif Ismail, Sara Al Hinaii, Asma Alshehhi, Noor Al Ashkar

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

Cement replacement by supplementary cementitious materials has been gaining momentum as a sustainable mechanism to reduce greenhouse gas emissions while also recycling industrial by-products. This paper presents the development and microstructure characterization of fly ash-based lightweight geopolymer concrete incorporating ground granulated blast furnace slag (GGBS). Concrete samples were prepared with 0%, 25% and 50% GGBS replacement and cured at 30°C, 60°C, and ambient temperature. While dune sand and lightweight expanded clay were used as aggregates, a mixture of sodium silicate and sodium hydroxide served as the alkaline activation solution. Microstructure evaluation was carried out at 7 and 28 days employing scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC). Residual fly ash and GGBS were identified in the concrete and bonded to geopolymeric reaction products. The microstructure highlighted the formation and coexistence of aluminosilicate hydrate and aluminum-rich calcium silicate hydrate with traces of sodium. Subsequent polymerization was also verified by an increase in FTIR and DSC peaks.

Original languageEnglish
Article number03004
JournalMATEC Web of Conferences
Volume120
DOIs
Publication statusPublished - Aug 9 2017
Event1st International Conference on Advances in Sustainable Construction Materials and Civil Engineering Systems, ASCMCES 2017 - Sharjah, United Arab Emirates
Duration: Apr 18 2017Apr 20 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Engineering(all)

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