Controlling the reaction kinetics of sodium carbonate-activated slag cements using calcined layered double hydroxides
By Xinyuan Ke, S. A. Bernal, J. Provis. 2016
294 citations recorded by the source corpus.
Abstract In this study, Na 2 CO 3 -activated slag cements were produced from four different blast furnace slags, each blended with a calcined layered double hydroxide (CLDH) derived from thermally treated hydrotalcite. The aim was to expedite the reaction kinetics of these cements, which would otherwise react and harden very slowly. The inclusion of CLDH in these Na 2 CO 3 -activated cements accelerates the reaction, and promotes hardening within 24 h. The MgO content of the slag also defines the reaction kinetics, associated with the formation of hydrotalcite-type LDH as a reaction product. The effectiveness of the CLDH is associated with removal of dissolved CO 3 2 − from the fresh cement, yielding a significant rise in the pH, and also potential seeding effects. The key factor controlling the reaction kinetics of Na 2 CO 3 -activated slag cements is the activator functional group, and therefore these cements can be designed to react more rapidly by controlling the slag chemistry and/or including reactive additives.
Subfields: Civil and Structural Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/afa5a0c4956898e8f58014f4938f78d622e07719
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Citations in the corpus
- Influence of limestone on the hydration of ternary slag cements (2017, background): “However, in slag composite cements the positive effect of limestone 48 on the strength may be counter-balanced by the formation of hydrotalcite [14, 15], thus 49 limiting the available alumina.”
- One-part geopolymer cement from slag and pretreated paper sludge (2018, background): “This interaction is proposed to take place before the precipitation of the Ce(A)eSeH gel (Bernal et al., 2015; GarciaLodeiro et al., 2015; Ke et al., 2016).”
- Uptake of chloride and carbonate by Mg-Al and Ca-Al layered double hydroxides in simulated pore solutions of alkali-activated slag cement (2017, methodology): “The CLDH is used for studying the ion-exchange capacity of hydrotalcite-like phases, because as it recrystallises to its layered double hydroxide structure with Mg and Al in the positively charged metal oxide sheet, the anions intercalated into the interlayers are able to be controlled according to ”