Rapid Freeze Thaw Chamber
Description:
This device is suitable for concrete frost resistance tests using dynamic modulus of elasticity, weight loss, and relative durability index as evaluation indicators. The purpose of this specialized rapid freeze-thaw test is to determine the frost resistance grade of concrete by measuring its resistance to repeated actions of water and negative temperature. The device adopts the water freezing and thawing method, in which standard concrete specimens are placed in rubber barrels and soaked in water. Then, the rubber barrels containing the specimens and water are arranged in the test chamber, and a refrigerant is used as the circulating medium to periodically freeze and dissolve the water layer around the specimens.
This equipment adopts a one box (slot) external circulation method, and the specimen placement box is made of high-grade 304 stainless steel material. The automatic control system adopts industrial computer control, with a high degree of automation. The control system and freeze-thaw equipment box are installed indoors, and the cold and hot medium box is installed indoors, consisting of an air-cooled condensing unit, one medium pump, one hot medium tank, one cold medium tank, etc. The cold and hot media exchange with the medium (antifreeze) in the test piece placement box through a medium pump, freezing and melting the water around the test piece. Control the cooling and heating temperature of the cold and hot tanks, and control the opening of the medium pump through a temperature controller to exchange the cold and hot medium with the medium inside the test piece placement box to achieve heating or cooling.
Specification:
Test piece size | 100 × 100 × 400 The temperature measurement specimens have the same size and a temperature measurement hole is left in the middle. |
Center temperature of the specimen at the end of freezing | - 18°C±2°C |
At the end of melting, the center temperature of the specimen | + 7°C±2°C The test temperature can be set according to the user's requirements, including the center temperature of the specimen and the temperature of the freeze-thaw medium. The temperature control accuracy is ± 2.0 ° C. |
Freeze thaw cycle | Each freeze-thaw cycle lasts for 2-4 hours, and the time used for melting is not less than 1/4 of the entire freeze-thaw cycle. |
Number of test pieces | 10 pieces, one of which is for temperature measurement |
External dimensions | 1650mm in length, 900mm in width, and 880mm in height The main functions of the system include: displaying and recording the center temperature of the specimen and the temperature of the circulating liquid; Conversion of freeze-thaw process and temperature control of circulating liquid; Control of freeze-thaw cycle times; Compressor discharge pressure, suction pressure, and motor unit temperature rise protection; Circulating liquid flow protection and over temperature protection; Motor overload protection, etc. The machine can automatically stop running in abnormal situations such as power and water outages. The entire freeze-thaw test process is fully automated, and in the event of a malfunction, a photoelectric alarm is triggered and corresponding protection measures are taken by oneself. |
Unit power supply | three-phase four wire system 380V 50HZ |
Refrigeration power | 2.6KW (3 horsepower low-temperature compressor) |
Heating power | 9KW |
Circulating pump power | 0.3KW |
Maximum operating power of the unit | 10KW |
12. Freeze thaw cycle medium | -45 ° C, antifreeze, injection volume: 36 kg (2 barrels of antifreeze) |
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