Tricalcium Silicate Hydration in the Presence of Various Salts

Etris, SF; Fiorini, YR; Lieb, KC; Moore, IC; Batik, AL; Kantro, D. L.

doi:10.1520/jte10661j

Cited by 38 publications

(2 citation statements)

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“…In accelerators like calcium chloride the ionic potential of cations and anions contribute to the effect by influencing the ion-hydratation processes as well as the diffusion and the transport of building blocks from the solution to the growing crystals [10]- [12]. Similar effects were observed with organic accelerators like calcium formate [1] [13].…”

Section: Introductionmentioning

confidence: 75%

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Investigation of the Transition Reaction of Tobermorite to Xonotlite under Influence of Additives

Hartmann¹,

Schulenberg²,

Buhl³

2015

ACES

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The objective of the present work was to investigate the transition reaction of the calcium silicate hydrate tobermorite into xonotlite under influence of additives. Tobermorite is the main binding agent in steam hardened building materials and the appearance of xonotlite indicates the progress of hardening and an overcuring of the material. Hydrothermal experiments under addition of sucrose, calcium formate and calcium chloride dihydrate to the main components quartz and lime were done using temperatures of 220˚C and a reaction time of 40.5 h. All experiments were performed with powders as well as with pressed educts. The products of all syntheses were analyzed with XRD, SEM/EDX and FTIR. The references as well as the syntheses with calcium chloride dihydrate led to the formation of 11 Å tobermorite and xonotlite. The former showed the best results and even synthesis with pressed educts and calcium chloride dihydrate revealed an accelerating effect of the additive. In contrast syntheses with sucrose had the worst reactivity and led to the formation of calcite beside the CSH-phase scawtite. The additive calcium formate was only slightly oppressing the crystallization of tobermorite and favouring the formation of xonotlite. Syntheses with pressed pellets and sucrose or calcium formate showed generally worse results.

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Section: Introductionmentioning

confidence: 75%

“…Further experiments must clarify if this behavior is ruled by pH-value [14]- [16] hand in hand with the ionic potential of the additional Ca and Cl ions in the reaction system [10]- [12].…”

Section: Discussionmentioning

confidence: 99%