The effect of additions of alkaline-earth metal chlorides on the setting behavior of a refractory calcium aluminate cement

Nilforoushan,; Sharp, J H

doi:10.1016/0008-8846(95)00146-4

Cited by 28 publications

(9 citation statements)

References 5 publications

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“…While saline may appropriately simulate tissue moisture, perhaps distilled water should have been used to simulate the intracanal moistened cotton pellet. With both MTA surfaces exposed to saline, there may be an effect from NaCl on MTA setting (23). However, despite these potential limitations, the focus of this investigation was to provide some initial insight into the effect of setting time and hydration conditions on MTA flexural strength.…”

Section: Discussionmentioning

confidence: 99%

Effect of Setting Conditions on Mineral Trioxide Aggregate Flexural Strength

Walker

Diliberto

Lee

2006

Journal of Endodontics

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Section: Discussionmentioning

confidence: 99%

Effect of Setting Conditions on Mineral Trioxide Aggregate Flexural Strength

Walker

Diliberto

Lee

2006

Journal of Endodontics

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“…However, chloride salts, which are powerful accelerators in OPC, normally have retarding effects in CSA, somewhat depending on dosage and temperature [25], [30]. Another inorganic retarder applied for CSA type cements is Borax (sodium tetraborate) [10], [31].…”

Section: Introduc Onmentioning

confidence: 99%

Effect of retarders on the early hydration of calcium-sulpho-aluminate (CSA) type cements

Zając

Skoček

Bullerjahn

et al. 2016

Cement and Concrete Research

151

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The retardation of calcium-sulpho-aluminate (CSA) type cements by three common retarders sodium gluconate, sodium-potassium tartrate and borax is investigated. The results show that each of the retarder has a different effect on the early-age hydrates assemblage as shown by quantitative X-ray diffraction, thermogravimetric analysis, scanning electron microscopy and pore solution analysis. Regardless the retarder used, the hydration starts with the formation of ettringite and of some X-ray amorphous hydrates. The ettringite-forming reaction is delayed specifically, depending on the retarder used. The results showed that the retardation is caused either by calcium complexation preventing hydrates formation or surface adsorption of inhibitors or by the formation of a semipermeable layer on the cement grains in the case of tartrate and gluconate. Borax retards the hydration by lowering the initial pH that destabilizes ettringite. Furthermore, the morphology of ettringite is altered depending on the type of the retarder used.

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“…The nucleation barrier was thus lowered explaining the acceleration of the hydration process of CA, either by the formation of these AFm hydrates themselves or by their action as heterogeneous nucleation substrates that would shorten the induction period. In the same line, it has been reported that: (i) the nucleation of one or more of the metastable hydrates is the rate controlling factor in the early hydration of CAC based calcium monoaluminate [38]; (ii) Ca-rich hydrates were found in CAC samples treated with LiCl [39], and (iii) the formation of AFm phases would promote the C 2 AH 8 nucleation, explaining its finding in lithium-treated CAC samples [22].…”

Section: Lithium Saltsmentioning

confidence: 80%

Study of the early hydration of calcium aluminates in the presence of different metallic salts

Durán

Sirera

Perez-Nicolas

et al. 2016

Cement and Concrete Research

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The effect of chlorides and nitrates of Li(I), Cr(III), Zn(II), Cu(II), Pb(II) nitrate and Cr(VI) (chromate) on the early hydration of ternary system of calcium aluminates (CA, CA 2 , C 12 A 7 ) was reported. Li(I) and Cr(III) caused a strong acceleration of the hydration, while Zn(II) as well as chromate gave rise to a slight acceleration. On the contrary, Pb(II) and Cu(II) retarded the hydration. A clear formation of AFm phases during the first hydration stages was found and related to the acceleration ability.Anions (nitrate or chloride as counterions or even chromate) were able to be incorporated into the interlayer space of AFm, yielding insoluble and stable compounds.A balance between the insolubility of the metal hydroxides (dependant on the low amphoteric character of the compound) and the ability of the formation of AFm hydrates seems to be very important to lean the equilibrium towards the retarding of the hydration or towards the acceleration, respectively.2

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The effect of additions of alkaline-earth metal chlorides on the setting behavior of a refractory calcium aluminate cement

Cited by 28 publications

References 5 publications

Effect of Setting Conditions on Mineral Trioxide Aggregate Flexural Strength

Effect of Setting Conditions on Mineral Trioxide Aggregate Flexural Strength

Effect of retarders on the early hydration of calcium-sulpho-aluminate (CSA) type cements

Study of the early hydration of calcium aluminates in the presence of different metallic salts

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