The Pervouralsk Dinas Works has developed mullite-silica vibrocast concrete of grade MKRV. In developing this grade we took into account all positive and negative aspects of the service of the previously used mullite-corundum concrete grade MKV. As a consequence, the mechanical strength of the concrete was raised in the whole service temperature range, its open porosity decreased and, accordingly, its impregnation with slag and metal decreases, and its heat-insulating properties were improved.
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机译：Pervouralsk Dinas Works已开发出MKRV级的莫来石-二氧化硅振铸混凝土。在开发该等级时，我们考虑了以前使用的莫来石-刚玉混凝土等级MKV的所有正面和负面方面。结果，在整个使用温度范围内提高了混凝土的机械强度，降低了其开孔率，因此减少了对矿渣和金属的浸渍，并改善了其隔热性能。
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