Interpretation on the influence of chloride ion on early hydration evolution for cementitious materials by a non-contact monitoring method

Lu, Youyuan; Xing, Feng; Shi, Guiyun; Liu, Yuqing; Zhu, Ding; Pan, Jinlong; Shao, Hongyu

doi:10.1016/j.conbuildmat.2018.11.187

Cited by 4 publications

(2 citation statements)

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“…In terms of strength development, most studies indicate that early age strength of concrete prepared with sea water increases and is unaffected in the long term in comparison to concrete prepared with potable water [ 9 ]. Hydration kinetics of Portland cement pastes prepared with increasing chloride concentration showed that the heat release associated with the dissolving period of the hydration process was diminished, and the hardening deceleration stage was postponed due to increased contact area for C 3 S, C 2 S, and C 3 AH phases [ 10 ]. Increased sodium chloride concentration also increases the dispersion of paste, as with superplasticizers [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…Hydration kinetics of Portland cement pastes prepared with increasing chloride concentration showed that the heat release associated with the dissolving period of the hydration process was diminished, and the hardening deceleration stage was postponed due to increased contact area for C 3 S, C 2 S, and C 3 AH phases [ 10 ]. Increased sodium chloride concentration also increases the dispersion of paste, as with superplasticizers [ 10 ]. In terms of microstructure, increasing chloride ion concentration up to 1.0% in Portland cement paste caused decreased porosity and subsequently also a decreased carbonation rate [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Sustainable batching water options for one-part alkali-activated slag mortar: Sea water and reverse osmosis reject water

et al. 2020

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Concrete production is globally a major water consumer, and in general, drinking-quality water is mixed in the binder. In the present study, simulated sea water and reverse osmosis reject water were used as batching water for one-part (dry-mix) alkali-activated blast furnace slag mortar. Alkali-activated materials are low-CO2 alternative binders gaining world-wide acceptance in construction. However, their production requires approximately similar amount of water as regular Portland cement concrete. The results of the present study revealed that the use of saline water did not hinder strength development, increased setting time, and did not affect workability. The salts incorporated in the binder decreased the total porosity of mortar, but they did not form separate phases detectable with X-ray diffraction or scanning electron microscopy. Leaching tests for monolithic materials revealed only minimal leaching. Furthermore, results for crushed mortars (by a standard two-stage leaching test) were within the limits of non-hazardous waste. Thus, the results indicated that high-salinity waters can be used safely in one-part alkali-activated slag to prepare high-strength mortars. Moreover, alkali-activation technology could be used as a novel stabilization/solidification method for reverse osmosis reject waters, which frequently pose disposal problems.

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Section: Introductionmentioning

confidence: 99%