Abstract
The properties of the conventional refractory concrete modified by means of the microsilica and the antiflocculant additions including the different kinds of the fire clay filler were investigated in the article. It was established that the refractory concrete with the filler Bos145 (about 44 % of Al2O3) had the smaller open porosity, and both high density and the ultimate compressive strength comparing to these characteristics which the concretes with the fillers Bos125 and Bos135 had (about 26 and 37 % of Al2O3respectively). Also it was found out that independently of the fire clay filler's kind another SiO2-based addition promoted the increase of the concrete's alkaline resistance by the factor of 5 and more. It was shown that this SiO2-based addition is effective at the temperatures up to 1100 °C, as at 1200 °C the chamotter concrete's porosity grew up and the resistance of the material against the alkaline melt decreased considerably.
Highlights
Традиционные жаростойкие бетоны с глиноземистым цементом и шамотными заполнителями широко применяются в тепловых агрегатах энергетической промышленности
Сдедует отметить достаточно высокие для традиционного бетона с шамотными заполнителями механические свойства модифицированных бетонов Б1–Б3, а также характерное для них снижение прочности после обжига (44‒66 МПа) по сравнению с этим показателем после сушки (71‒109 МПа)
The impact of calcium aluminate cement hydration upon the properties of refractory castable / C
Summary
Были использованы следующие материалы: глиноземистый цемент Istra-40 (состав, %: Al2O3 38‒42, CaO 37‒40, Fe2O3 13‒17 и др.; Sуд = 295 м2/кг; огнеупорность 1250 оС) фирмы Calucem GmbH (Германия), шамотный заполнитель фракции
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