Alumina-silicon carbide-carbonaceous cement-free castable suitable for winter construction

Abstract

The invention relates to an aluminum oxide-silicon carbide-carbonaceous cement-free castable suitable for construction in winter. The technical scheme is as follows: the castable comprises the following components in percentage by weight: 58-62wt% of dense corundum particles; 6-10 wt% of silicon carbide particles; 2-3 wt% of spherical asphalt; 4-10 wt% of alumina micro powder; 4 to 5 wt% of silicon dioxide micro powder; 7-10 wt% of silicon carbide powder; 1 to 1.5 wt% of silicon powder; 0.1-0.15 wt% of polyacrylic acid; 6-9 wt% of dense corundum fine powder; 0.04-0.1 wt% of water-soluble fibers; and 0.2-0.3 wt% of caustic-burned magnesia powder. During construction, when the environment temperature and the water temperature are both lower than 15 DEG C, after construction is completed, a pouring body is cured at 33-38 DEG C until the pouring body is completely cured. The concrete has the advantages of being small in water adding amount, short in setting time and high in construction site safety, is good in compactness, free of cement, high in thermal strength and good in various technical indexes, and particularly completely meets the requirements of construction in winter.

Description

technical field [0001] The invention belongs to the technical field of alumina-silicon carbide-carbon cementless castable. Specifically relates to an alumina-silicon carbide-carbon cementless castable suitable for winter construction. Background technique [0002] Cement bound Al 2 o 3 - SiC-C castables, even if the highest-grade raw materials are used, cannot avoid the degradation of high-temperature performance caused by the formation of anorthite and other low-melting point substances due to the introduction of cement, which severely restricts the Al 2 o 3 - Further improvement of the performance of SiC-C castables. Therefore, no cement bound Al 2 o 3 -SiC-C castables have always been the ideal state that the industry hopes to achieve. [0003] Technical personnel at home and abroad to achieve Al 2 o 3 -SiC-C based castables have been studied extensively for the purpose of non-cementation. The general method is to use silica sol or hydraulic alumina to replace c...

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Problems solved by technology

However, this cement-free iron trench castable has problems such as: ρ-alumina itself is unstable, ρ-alumina is affected by the ambient temperature in the castable, the reactivity varies greatly, and the setting time is not easy to control, so it is not suitable for winter construction.

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