Concrete rapid freeze-thaw tester

1、Temperature range：-20℃～20℃（user can set）, control accuracy：±0.1℃

2、Temperature uniformity: <2℃ between each point

3、Size of specimen：100mm×100mm×400mm

4, specimen capacity: can be divided into 10 pieces (3 groups), 16 pieces (5 groups), 28 pieces (9 groups), (each containing a center specimen)

5, test parameters: each freeze-thaw cycle should be completed within (2 ~ 4) hours, and for melting time is not less than 1/4 of the entire freeze-thaw cycle time; in the process of freezing and melting, the specimen center of the lowest and highest temperatures were controlled in (-18 ± 2) ℃ and (5 ± 2) ℃, at any time, the center of the specimen temperature is not higher than 7 ℃, and is not lower than -20 ℃; each piece of specimen from

Each specimen from 3 ℃ down to -16 ℃ used in not less than 1/2 of the freezing time, the

Each specimen from -16 ℃ to 3 ℃ time used not less than 1/2 of the entire melting time, the temperature difference between inside and outside the specimen does not exceed 28 ℃

6, the thickness of the water layer around the specimen: 3mm

7, power supply voltage: AC380V three-phase five-wire system

8、Test Temperature: (23±2)°C