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Effects of water to binder ratio on the chloride binding behaviour of artificial seawater cement paste blended with metakaolin and silica fume.
- Source :
-
Construction & Building Materials . Oct2022, Vol. 353, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- • Effects of water to binder (w/b) ratios (0.2 and 0.4) and SCMs (silica fume and metakaolin) on chloride binding behaviour of seawater cement paste (SCP) are investigated. • Influence of water to binder (w/b) ratios (0.2 and 0.4) and SCMs (silica fume and metakaolin) on the porosity and pore size distribution of SCP is revealed by the 1H Nuclear magnetic resonance (NMR) measurement. • The risk of steel corrosion in SCP with different w/b ratios is evaluated by the [Cl−]/[OH−] ratio. • The relationship between chloride binding ratio, porosity and [Cl−]/[OH−] ratio has been explored. This work investigates the effects of water-to-binder (w/b) ratio and supplementary cementitious materials (SCMs) including silica fume (SF) and metakaolin (MK) on chloride binding of seawater cement paste (SCP) by using a water extraction method. The chloride binding capacity, contents of chloride bound in Friedel's salt and chloride adsorbed by C S H gel are quantified. The resistance to steel corrosion is evaluated by [Cl−]/[OH−] ratio. The results show that the chloride binding ratio (content of bound to free chloride) gradually increases with the w/b ratio decreasing from 0.4 to 0.2. In addition, the chloride ions adsorbed by C S H gel in SCP with w/b ratio 0.2 contributes more largely to chloride binding capacity than SCP with w/b ratio 0.4. Moreover, the incorporation of MK improves the chloride binding capacity of SCP while the utilization of SF doesn't make much difference. In addition, the [Cl−]/[OH−] ratio in SCP keeps at a very low level during the whole experimental process, and decreases with the reduction of w/b ratio, the increase of content of MK and curing ages. The correlation of chloride binding ratio with [Cl−]/[OH−] ratio can be described by an exponential decay model while a linear relationship is observed between chloride binding ratio and the volume of macropores larger than 200 nm in diameter. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09500618
- Volume :
- 353
- Database :
- Academic Search Index
- Journal :
- Construction & Building Materials
- Publication Type :
- Academic Journal
- Accession number :
- 159269333
- Full Text :
- https://doi.org/10.1016/j.conbuildmat.2022.129110