The effect of inorganic salts on tricalcium silicate hydration

Brown, Paul; Harner, Caroline L.; Prosen, E.J.

doi:10.1016/0008-8846(86)90063-3

Cited by 67 publications

(66 citation statements)

References 10 publications

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“…The rate of hydration in the acceleration period increased considerably with sulfate content. These are consistent with Brown et al [57] who previously reported that the presence of calcium sulfate (CaSO 4 ) in solution slightly retards hydration of pure C 3 S at the early age but accelerates it thereafter. This suggests that to apply our model to fly ash-cement mixtures with different sulfate contents it may be necessary to adjust the model coefficients B and C in Eq.…”

Section: Applicability Of the Model To Other Fly Ash-cement Mixturessupporting

confidence: 82%

Effect of fly ash on the kinetics of Portland cement hydration at different curing temperatures

Narmluk

Nawa

2011

Cement and Concrete Research

173

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Section: Applicability Of the Model To Other Fly Ash-cement Mixturessupporting

confidence: 82%

Effect of fly ash on the kinetics of Portland cement hydration at different curing temperatures

Narmluk

Nawa

2011

Cement and Concrete Research

173

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“…Similar effects were observed with organic accelerators like calcium formate [1] [13]. Even the simple role of decrease of pH-value has to be taken into account when additives are inserted [14]- [16]. In contrast, an increase of alkalinity was found to have no remarkable effect on C 3 S hydratation [13] [17].…”

Section: Introductionsupporting

confidence: 49%

“…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%

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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“…6. Since the specimen after 84 hours of submersion had higher amount of chloride content, plus the present of chloride ions in the pore structure in concrete reduce the pH of solution and then accelerate hydration [12]. Thus, its pore structure turned to be more solid and less liquid which is known as a good conductor with low specific heat compared to water.…”

Section: Effect Of Chloride Contamination On Changing Of Concrete Temmentioning

confidence: 99%

Effects of Chloride Content on Thermal Properties of Concrete

Im¹

2018

GEOMATE

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ABSTRACT:The thermal properties of cement-based materials have gained more attention not only for the thermal analysis but also for the application of Non-Destructive Tests for building, bridge and other structures. Presence of chloride ions in pore structure was also found to affect thermal properties of concrete. This paper aims to study effects of chloride content on thermal properties of concrete. Specimens were submerged in sodium chloride solution for different period of time. Then, they were subjected to the heating test. It was found out that temperature of specimens with presence of chloride ions in pore solution increased faster compared to specimens without chloride contaminations. As the amount of chloride content in pore structure increased, concrete temperature also rose faster. The results obtained from this study can be used to accurately estimate thermal properties of concrete so that thermal analysis and application of Non-Destructive Tests such as Infrared Thermography can be effectively implemented.

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The effect of inorganic salts on tricalcium silicate hydration

Cited by 67 publications

References 10 publications

Effect of fly ash on the kinetics of Portland cement hydration at different curing temperatures

Effect of fly ash on the kinetics of Portland cement hydration at different curing temperatures

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

Effects of Chloride Content on Thermal Properties of Concrete

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