Method for cooling concrete coarse aggregates to O deg.C and to -18 deg.C

Abstract

One large cooling house is built near the concrete stirring station, and cold air at the temperature of -6 deg.c to -35 deg.c is used as the cooling medium to cool coarse aggregate for certain time to lower its temperature from 10-40 deg.c to -18 to 0 deg.c. Or, the coarse aggregate is first cooled with air at 0 deg.c or so for about 15 min and then cooled with air at -8 deg.c to -35 deg.c in the same house to lower its temperature to -18 to 0 deg.c.

Description

1. Technical field [0001] The invention relates to a cooling method for concrete coarse aggregate. 2. Technical background [0002] At present, in order to cool the concrete coarse aggregate with a temperature of 10°C to 40°C to 0°C to -9°C, it has to be cooled twice, outside the concrete mixing building, with -6°C cold air or 2°C-4°C Cold water is used as the cooling medium, and the coarse aggregate is cooled first, and the temperature of the coarse aggregate is cooled to 4°C to 8°C, and then in the aggregate bin in the concrete mixing building, use -8°C to -14°C cold air Cool the coarse aggregate again, in two cooling locations, after two coolings, the temperature of the coarse aggregate can be cooled to 0°C to -9°C, the place for the second cooling of the coarse aggregate is to choose the concrete mixing plant It is carried out in the aggregate silo in the concrete mixing building. When the coarse aggregate is cooled in the aggregate silo in the concrete mixing building,...

AI Technical Summary

Problems solved by technology

In this method of cooling coarse aggregate twice, when the coarse aggregate is cooled for the first time, the temperature of the cooling medium is relatively high, so it is impossible to cool the coarse aggregate to 0°C to -9°C after the first cooling of the coarse aggregate. ℃, it is necessary to use the second cooling of coarse aggregate, and in this two-time coarse aggregate cooling method, the place for the second cooling of coarse aggregate should be carried out in the aggregate bin in the concrete mixing building, because The volume of the aggregate bin in the concrete mixing building is relatively small. Although the temperature of the second cooling medium is reduced to -8°C to -14°C, the temperature of the coarse aggregate should be reduced to 7.5°C to 15°C. The production capacity has to be reduced a lot to achieve it. When the production capacity of the concrete mixing plant is relatively high, the final temperature of the coarse aggregate will be seriously overheated, causing the final temperature of the pre-cooled concrete to be seriously overheated.