TY - JOUR
T1 - Effect of GGBS and curing temperature on microstructure characteristics of lightweight geopolymer concrete
AU - El-Hassan, Hilal
AU - Ismail, Najif
AU - Al Hinaii, Sara
AU - Alshehhi, Asma
AU - Al Ashkar, Noor
N1 - Funding Information:
Financial support for this study was provided by the United Arab Emirates University under the grants 31N249 and 31N241. Moustafa Mansour, Mohammed Al-Mawri, Muath Bassam, Abdalla El-Hashmi, and Faisal Ali assisted with specimen preparation. Abdelrahman Alsallamin and Ehab Shehab helped in performing the microstructure analysis. Ashtech International supplied the fly ash. Emirates Cement Factory provided the ground granulated blast furnace slag and aided with chemical analysis of constituent materials.
Publisher Copyright:
© The Authors, published by EDP Sciences, 2017.
PY - 2017/8/9
Y1 - 2017/8/9
N2 - 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.
AB - 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.
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U2 - 10.1051/matecconf/201712003004
DO - 10.1051/matecconf/201712003004
M3 - Conference article
AN - SCOPUS:85028064657
SN - 2261-236X
VL - 120
JO - MATEC Web of Conferences
JF - MATEC Web of Conferences
M1 - 03004
T2 - 1st International Conference on Advances in Sustainable Construction Materials and Civil Engineering Systems, ASCMCES 2017
Y2 - 18 April 2017 through 20 April 2017
ER -