Study of Modified Heat-Resistant Concrete in Relation to Type of Chamotte Filler

Zdаnyavichus, P.; Antonovich, V.; Boris, Renata; Stonis, R.; Shukis, R.; Vitek, E.

doi:10.1007/s11148-019-00286-1

Cited by 3 publications

(2 citation statements)

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“…DTG analysis was carried out for comparison of the processes that are taking place at high temperatures in the castables with and without GQS. It was determined [20,21] that in samples without GQS, the protective layer does not form.…”

Section: Dtg Test Results Of MIX Of K 2 Co 3 and Castable Powdermentioning

confidence: 99%

“…The alkali and silica reaction produces a viscous glass phase that prevents the alkali from penetrating deeper into the refractory material [19]. Our previous research into the alkali resistance of concrete [20,21] showed that the addition of finely ground quartz sand to fireclay castable promotes the formation of a protective glassy layer on the surface of the castable exposed to K 2 CO 3 at 1100 • C. The resistance of fireclay castables to alkali attack determined by the static crucible method increased by more than five times (from 4 to more than 20 cycles).…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Formed Protective Layer Inhibiting Alkali Corrosion in Aluminosilicate Refractory Castables

et al. 2022

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This article analyzes the mechanism of the protective layer formation under the action of alkali in a refractory castable when ground quartz sand (GQS) is used as an admixture to produce refractory conventional castables (CC) and medium cement castables (MCC). It was found that, independently of the castable composition, the addition of GQS (2.5%) reduces the degree of K2CO3 dissolution at high temperature, and the released potassium reacts with the silica and forms a viscous potassium silicate glass, which reduces the mobility of alkali. The liquid phase formed filled some of the open pores and hindered the penetration of potassium into the deeper layers of the refractory castable. The thickness of the formed protective layer, after three cycles of the alkaline corrosion test, varies from 700 µm up to 1300 µm, depending on the castable composition.

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Section: Dtg Test Results Of MIX Of K 2 Co 3 and Castable Powdermentioning

confidence: 99%