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Title: | Effect of NaOH content on hydration, mineralogy, porosity and strength in alkali/sulfate-activated binders from ground granulated blast furnace slag and phosphogypsum | Authors: | GIJBELS, Katrijn Pontikes, Yiannis SAMYN, Pieter SCHREURS, Sonja SCHROEYERS, Wouter |
Issue Date: | 2020 | Publisher: | PERGAMON-ELSEVIER SCIENCE LTD | Source: | Cement and Concrete Research, 132 (Art N° 106054) | Abstract: | This study investigates the effect of NaOH content on alkali/sulfate-activated binders from 90 wt% ground granulated blast furnace slag (GGBFS) and 10 wt% phosphogypsum (PG). Alkali activators were prepared with a NaOH molarity ranging from 0 M to 4 M. The hydration was monitored using in-situ X-ray diffraction (XRD) and isothermal calorimetry. The hydration product assemblage was investigated using XRD, thermogravimetric analysis (TGA), Fourier-transformed infrared (FTIR) spectroscopy, nitrogen adsorption/desorption and compressive strength tests. A molarity of 0 M NaOH gave rise to the highest porosity and highest strength, although setting occurred only after 7 days. From a molarity of 2 M NaOH and higher, ettringite disappeared and got replaced by a monosulfate phase (i.e., NaCa4Al2O6(SO4)1.5.15H2O) and amorphous aluminum-hydroxide. This study shows the potential of using GGBFS and PG for the development of novel by-product based cementitious binders. | Keywords: | Ground granulated blast furnace slag;Phosphogypsum;Supersulfated cement;Alkali-activated binder | Document URI: | http://hdl.handle.net/1942/30999 | ISSN: | 0008-8846 | e-ISSN: | 1873-3948 | DOI: | 10.1016/j.cemconres.2020.106054 | ISI #: | WOS:000537846000018 | Rights: | 2020 Elsevier Ltd. All rights reserved. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2021 |
Appears in Collections: | Research publications |
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File | Description | Size | Format | |
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Manuscript.pdf | Peer-reviewed author version | 2.35 MB | Adobe PDF | View/Open |
2020 - Effect of NaOH content on hydration mineralogy porosity and strength in alkali sulfate activated binders from ground granulated blast furnace slag and phosphogypsum.pdf Restricted Access | Published version | 4.06 MB | Adobe PDF | View/Open Request a copy |
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