During this time, the average daily sand temperatures ranged from 4 to 12 °, t. e. The difference between maximum and minimum temperatures was 8 °.
The average daily crushed stone temperatures changed from 2 to 6 °. The temperature of the concrete mixture also did not remain constant and during the specified period changed from 12 to 16 °. Observations of the degree of uniformity of heating the aggregates at this factory were continued in February and in March 1955. The latest observations set an even larger range of fluctuations in the temperature of concrete aggregate when leaving the hen of the hen.
February 14, 1955. within 3 hours. The temperature of the sand emerging from the bunker ranged from 11 to 23 ° and; The temperature of crushed stone over the same time changed from 3 to 20 °. March 30 of the same year in 4/2 hours, the sand temperature changed from 3 to.-20 °, crushed stone – from 6 to 16 °.
Thus, when the aggregates exit from the bunker, the temperature difference in the mass of aggregates reaches 10-17 °, which negatively affects the quality of the concrete mixture. Uneven heating of aggregates is accompanied by an uneven distribution of moisture in them due to the phenomenon. For example, February 17, 1955. The selection of medium samples of aggregates was carried out every 30 minutes. for a salary hour. During this time, sand humidity ranged from 5.5-9.2%, crushed stone-2.2-5.4%. February 10 selection of samples of aggregates was carried out 3 hours.
At the same time, the humidity of the aggregates fluctuated: sand from 5 to 6.7%, crushed stone – from 4.5 to 5.8%. Such significant fluctuations in the humidity of the aggregates extremely complicate the dosing of the concrete mixture and, therefore, worsen the quality of the concrete mixture.