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16 standard specimens can be tested simultaneously, using Air-Cooled mode, with a freeze-thaw cycle of 2.5 to 4 hours, automatic temperature measurement recording and multiple Safety protection systems to ensure stable and reliable testing process.
Category : Other Instruments
Brand : hzaoc
SKU : NB027125
Service :The delivery and service By NBCLab.Com
HZAOC DR-10A concrete quick freeze-thaw machine is a special equipment used to measure the frost resistance performance of concrete specimens under the condition of water freezing and thawing. The equipment evaluates the frost resistance performance of concrete specimens by the number of freeze-thaw cycles or the frost resistance durability coefficient through the rapid freeze-thaw cycle test.
1. Adopt stainless steel plate shell and Tank, polyurethane foam overall foam insulation layer, the structure is sturdy and durable. 2. Equipped with imported fully enclosed refrigeration Compressors and high-quality refrigeration control components, valves and electrical components to ensure the stability and reliability of the system. 3. Using brand computer operation Control system, you can arbitrarily set the number of cycles, core temperature alarm value and other parameters, automatically display the number of cycles completed, and view the historical Linear dispersion and reports. 4. With perfect protection functions, including phase loss, short circuit, overload, overtemperature, overpressure, low refrigerant level or cut off, chill down cycle water shortage, etc., to ensure the safe operation of equipment. 5. The pipeline layout is optimized to ensure that the temperature of the specimen groove is uniform, and the temperature difference between the center and the surface of the specimen is less than 28 degrees Celsius. 6. Adopt special pipe type stainless steel electric heating tube for direct heating, with high heating efficiency.
The equipment reduces the temperature of the refrigerant (-35 ° C antifreeze) through the refrigeration system, and the circulating pump drives the refrigerant in the domestic circulation of the specimen tank to quickly freeze the concrete specimen soaked in it. After the freezing reaches the set conditions, the Control system starts the electric heating system to heat the refrigerant to melt the specimen. The temperature measurement system monitors the center temperature of the specimen and the temperature of the refrigerant in real time. The Control system automatically cycles the freeze-thaw process according to the preset freeze-thaw cycle (2.5~ 4 hours) and temperature conditions (such as the center temperature of the frozen specimen -16 +/- 2 ° C, and the melting end 5 +/- 2 ° C), and records the number of cycles.
Suitable for measuring the frost resistance performance of concrete specimens under the condition of water freezing and water thawing
GB/T50082-2009、GB/T2542-2012、GB28635-2012、GB/T4111-2003、GB/T11968-2006、GB/T11973-2006、GB/T3810.12-2006、GB/T11969-2008、GB/T7019-2014
Prepare concrete specimens that meet the size requirements (100 × 100 × 400mm) and place them in the specimen bucket. 2. Inject the specified amount of -45 ° C antifreeze into the specimen barrel as the freeze-thaw circulating medium. 3. Connect the equipment power supply (3N380V 50HZ) and ensure that the chilled down water circulation system (if applicable) is working properly. 4. Set the required number of freeze-thaw cycles, the upper and lower limit alarm values of the center temperature of the specimen and other parameters on the Control system interface. 5. Start the equipment, and the system will automatically run the freeze-thaw cycle program, including the refrigeration, circulation, and heating of the refrigerant. 6. During the operation of the equipment, the number of cycles, the temperature of the specimen center, and the temperature of the refrigerant can be monitored through the digital display instrument or computer interface. 7. After the test reaches the set number of cycles or the automatic stop condition, the equipment stops running and the final data is recorded.
• Before the equipment runs, ensure that the refrigerant level is normal and the circulating water supply is sufficient for chilling down (for configurations that require Water-Cooled) to prevent the trigger protection function from causing downtime. • The power supply should meet the requirements (3N380V 50HZ), and ensure that the wiring is correct, with protection such as phase loss and short circuit. When setting the freezing and melting time and temperature parameters, it is necessary to meet the standard requirements (e.g. freezing end time 1.5 to 2.5 hours/temperature -16 +/- 2 ° C, melting end time 1.0 to 1.5 hours/temperature 5 +/- 2 ° C). • Regularly check the working status of the refrigeration system, circulating pump, heating tube, Sensor and other components to ensure stable equipment performance. When operating and maintaining equipment, pay attention to safety and avoid contact with high or low temperature components and refrigerants in operation. Equipment should be placed in a well-ventilated environment, and Air-Cooled models need to ensure surrounding air circulation. • When placing the specimen, ensure that the number of specimens placed in the specimen barrel (size 690x300x600mm) does not exceed the specified (16 pieces), and ensure that the specimen is completely immersed in the refrigerant.
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