Lithium Salts in Rapid Setting High-Alumina Cement Materials

Matusinović, Tomislav; Vrbos, Nevenka; Čurlin, D.

doi:10.1021/ie00035a032

Cited by 20 publications

(3 citation statements)

References 4 publications

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“…To counteract the retardation of the cement hydration reaction, the setting accelerator lithium carbonate was added to the suspension 16,17 acting as heterogeneous nuclei and thus lowering the nucleation barrier to precipitate the hydrated calcium aluminate. As shown by the rheology measurements of the early setting phase in Figs.…”

Section: Resultsmentioning

confidence: 99%

Microstructural Control of Self-Setting Particle-Stabilized Ceramic Foams

Juillerat

Gonzenbach

Elser

et al. 2010

Journal of the American Ceramic Society

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The ability to tailor the microstructure of porous ceramics is essential in order to fulfill the requirements of various applications. Depending on the use of porous ceramics, microstructures with open or closed pores, adjustable pore sizes, and a possible self-setting ability of the wet foam are required. We present a direct foaming method to synthesize self-setting foams with controlled microstructures, based on our previous studies on particle-stabilized foams. For the experimental set-up, alumina particles were partially hydrophobized with propyl gallate and the resulting suspensions were combined with a calcium aluminate cement reaction. Pore size and the fraction of open pores can be controlled by the particle concentration and the setting rate of the cement reaction. As a result, self-setting ceramiccement composites with porosities ranging from 40 to 95 vol% and closed as well as open pores with sizes between 30 lm and 1 mm were achieved. Compared with other methods used to produce self-setting inorganic macroporous materials, foams made with this method cover a wider pore size and porosity range and reach higher total porosities.

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Section: Resultsmentioning

confidence: 99%

Microstructural Control of Self-Setting Particle-Stabilized Ceramic Foams

Juillerat

Gonzenbach

Elser

et al. 2010

Journal of the American Ceramic Society

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“…The setting time is approximately the same for the three different accelerator concentrations and undetectable when not using any lithium see Fig 2 . Lithium salts have been used as accelerators for high alumina cements (HAC) for a long time. More recently Matusinovi et al have made a rather extensive study on how lithium salts affect the hydration of HAC's [5].The lithium immediately reacts and precipitates as a lithium hydrometaaluminate hydrate (LiH(AlO 2 ) 2 . These hydrates then function as heterogeneous precipitation sites for the calcium aluminate hydrates and helps to supress the kinetic nucleation barrier connected with the precipitation.…”

Section: Resultsmentioning

confidence: 99%

“…This lithium salt action suppresses the induction period of the cement hydration and accelerates the setting thus resulting in a high early strength. If the addition of lithium salts is too high, this results in lowered long-term strength [5].…”

Section: Resultsmentioning

confidence: 99%

The Influence of Condensing Technique and Accelerator Concentration on Some Mechanical Properties of an Experimental Bioceramic Dental Restorative Material

Lööf¹,

Engqvist

Gómez-Ortega³

et al. 2003

KEM

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In this paper the influence of condensing technique and accelerator concentration on hardness and dimensional stability of an experimental version of the bioceramic filling material DoxaÔ T is tested. In addition a simple test of the setting time depending on accelerator concentration has also been done together with a test showing the temperature increase experienced in the bottom of a cavity when condensing with ultrasonic tips and varying the amplitude. In order to achieve early age hardness (after 4 hours) an addition of lithium to the hydration liquid is necessary if condensing is made manually. The ultrasonic vibrations bring the filler grains closer together yielding a denser end product where the maximum pore size is decreased as compared with a manually condensed sample. When using ultrasonic condensing no lithium is needed. The ultrasonic tip also transfers extra energy, mainly in the form of heat, to the material, which may speed up the hydration giving improved early age properties. Condensing with the ultrasonic device also gives higher longterm (64 days) hardness than the manual condensing. The samples condensed with the ultrasonic device and with 0 and 18mM LiCl both showed a hardness of about 150 HV(100g) after 64 days. Both for manual and ultrasonic condensing the highest hardness is achieved by using no or low additions of lithium. Regarding the dimensional stability no differences could be seen either for the different accelerator concentrations or for the different condensing techniques. The setting time is roughly the same for the three different accelerator concentrations and undetectable with this method when not using any lithium. The temperature rise in the filling when condensing with the ultrasonic device is dependent on the amplitude of the vibrations and the contact time between tip and filling.

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Effect of lithium salts on Portland cement/high alumina cement paste hydration

Gu¹,

Beaudoin²

1993

J Mater Sci Lett

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Lithium Salts in Rapid Setting High-Alumina Cement Materials

Cited by 20 publications

References 4 publications

Microstructural Control of Self-Setting Particle-Stabilized Ceramic Foams

Microstructural Control of Self-Setting Particle-Stabilized Ceramic Foams

The Influence of Condensing Technique and Accelerator Concentration on Some Mechanical Properties of an Experimental Bioceramic Dental Restorative Material

Effect of lithium salts on Portland cement/high alumina cement paste hydration

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