Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/30999
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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