As the core equipment for studying the durability of concrete, the carbonation test chamber's environmental control accuracy directly affects the reliability of test data. To ensure the long-term stable operation of the equipment, a systematic daily maintenance system needs to be established. Develop specialized maintenance plans from four dimensions: environmental management, component maintenance, parameter calibration, and safety protection.

1、 Environmental Management: Creating Stable Operating Conditions

Equipment positioning optimization

The test chamber should be placed at a certain temperature15-25℃Relative humidity<60%An independent space away from direct sunlight and ventilation openings. The equipment needs to be kept around≥30cmHeat dissipation space, avoid placing it against the wall to reduce heat dissipation efficiency. If the ambient temperature exceeds30℃Air conditioning cooling should be activated to prevent compressor overload operation.

Pollution prevention and control

Record the environmental temperature and humidity daily to ensure that there are no corrosive gases, dust, or other pollutants around the test chamber. Wipe the door seal with silicone grease once a week to prevent aging and air leakage. When not in use for a long time, desiccants should be placed inside the box and the door gap should be kept slightly open to avoid deformation of the sealing strip.

2、 Component maintenance: ensuring the reliability of the core system

Humidification system maintenance

Clean the humidifier water tank and nozzle monthly, using distilled or deionized water to prevent scale deposition. Replace the filter screen of the water tank quarterly and check whether the spray volume regulating valve is flexible. If nozzle blockage is found, it needs to be cleaned with a soft bristled brush, and the use of metal tools is strictly prohibited.

Maintenance of refrigeration system

Clean the surface dust of the condenser with a vacuum cleaner every month, and check the oil level and color of the compressor every six months. If the refrigeration oil turns black or contains impurities, it needs to be replaced by a professional. The drainage pipe should be blown through with compressed air every quarter to prevent blockage and water accumulation.

Maintenance of gas control system

The carbon dioxide pressure reducing valve is debugged by professionals every six months to avoid gas leakage. Calibrate the flow meter with a gas detector every quarter to ensure a stable input flow rate10-15L/minCheck the gas cylinder fixing device monthly to prevent safety accidents caused by tipping.

3、 Parameter calibration: maintain data accuracy

sensor calibration

The temperature sensor is compared with a standard thermometer every six months, and the humidity sensor is calibrated with a humidity generator every quarter. The carbon dioxide sensor is calibrated monthly with standard gas to ensure concentration display error≤±1.5%.

Control instrument verification

Conduct control logic testing every quarter to simulate abnormal operating conditions such as overheating and overload, and verify the reliability of the alarm system. Every year, a third-party organization conducts comprehensive metrological verification and issues calibration certificates.

4、 Safety protection: prevent equipment failure and personnel injury

Electrical safety inspection

Check the power cord, plug, and grounding device monthly to ensure no damage or aging. The leakage protector should be tested once a month, and the operating current should be≤30mA.

Strengthening operational standards

During the experiment, frequent opening of the box door is strictly prohibited, and the single opening time should be controlled within15Within seconds. Wear protective gloves when taking and placing test specimens to prevent low-temperature frostbite or high-temperature burns. Before long-term shutdown, it is necessary to turn off the gas source and power supply, and drain the accumulated water in the box.

5、 Maintain records and archive management

Establish a digital maintenance ledger to record the date, content, replacement part model, and operator information of each maintenance. When equipment malfunctions, detailed records of the phenomenon, handling process, and verification results are required. The maintenance archives should be kept at least5To provide a basis for the full lifecycle management of equipment.

By implementing the above maintenance plan, the failure rate of the carbonization test chamber can be effectively reduced, ensuring that the test environment parameters remain stable within the standard range for a long time (temperature)20±2℃Humidity70±5%TheCO₂concentration20±3%）. Practice has shown that standardized maintenance can extend the service life of equipment30%Above, while controlling the repeatability error of the experimental data within±5%Provide reliable guarantee for the durability research of concrete.