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Influence of SiO2/Al2O3 Content on Structure and Hydration Activity of Granulated Blast Furnace Slag

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Abstract:

Granulated blast furnace slag (GBFS) is a by-product of manufacturing iron. Samples of GBFS with different ratio of SiO2/Al2O3 were prepared by simulating the actual process of GBFS in laboratory. This study investigated the influence of SiO2/Al2O3 content on structure and hydration activity of GBFS which were characterized by X-ray fluorescence (XRF), powder X-ray diffraction (XRD), infrared radiation (IR) and mechanical testing. It is found that the vitreous content of each sample is above 97% and the hydration activity indexes of 7d and 28d of samples significantly decrease with the increase of SiO2/Al2O3 ratio. The IR characteristic absorption spectrum shows that the silicates mainly exist in [SiO4]-tetrahedra and the aluminum atoms are in different coordination states and the bonding strengths rise with the increase of SiO2/Al2O3 ratio.

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Periodical:

Key Engineering Materials (Volume 633)

Pages:

240-244

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.633.240

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Online since:

November 2014

Authors:

Su Ping Cui*, Ling Ling Liu, Jing Chen, Ya Li Wang, Jian Feng Wang, Hui Wang, Shi Jie Dong

Keywords:

Granulated Blast Furnace Slag, SiO2/Al2O3, Slag Activity

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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