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Impacts of C-S-Hs-PCE and Na.sub.2SO.sub.4 on hydration properties of lithium slag-cement composite binder
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Impacts of C-S-Hs-PCE and Na.sub.2SO.sub.4 on hydration properties of lithium slag-cement composite binder
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Impacts of C-S-Hs-PCE and Na.sub.2SO.sub.4 on hydration properties of lithium slag-cement composite binder
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Journal Article
Impacts of C-S-Hs-PCE and Na.sub.2SO.sub.4 on hydration properties of lithium slag-cement composite binder
2024
Overview
Synergistic effects of the synthetic calcium silicate hydrates (C-S-H)/polycarboxylate (PCE) and Na.sub.2SO.sub.4 on hydration properties and microstructure of cement-lithium slag (LS) composite binder were analyzed. Results showed that C-S-Hs-PCE and Na.sub.2SO.sub.4 exhibited a synergistic effect on hydration acceleration of LS-cement binder. Na.sub.2SO.sub.4 increased alkalinity of interstitial solution and promoted dissolution of LS. Dissolved Al and Si from LS powder reacted with dissolved SO42- from Na.sub.2SO.sub.4 to produce extra hydrates, and C-S-Hs-PCE accelerated pozzolanic reaction as well as hydration reaction via nucleation effect collaborated with dispersing effect. C-S-Hs-PCE accelerated reaction process of Na.sub.2SO.sub.4 via nucleation effect, and activation effect of Na.sub.2SO.sub.4 provided more newly-formed hydrates to act as nucleation seeds or crystal skeleton for the hydration of new phases. Newly formed hydrates promoted exceedingly the appearance of network, leading to a refinement of microstructure.
