The Mortar Drying Shrinkage Test Humidity Cabinet is suitable for temperature and humidity conditioning tests of specimens made from waterproofing membranes, cement, cement concrete, and other construction materials.

Mortar Drying Shrinkage Test Humidity Cabinet

Model: TDYH-511A/511B

I. Product Overview

The Mortar Drying Shrinkage Test Humidity Cabinet is developed and manufactured in accordance with JTG E30-2005, Test Methods of Cement and Concrete for Highway Engineering, specifically T 0511-2005, Test Method for Drying Shrinkage of Cement Mortar. ASTM C596-23 is provided as a reference standard.

The equipment is applicable to Portland cement, ordinary Portland cement, slag Portland cement, fly ash Portland cement, composite Portland cement, road Portland cement, and other types of cement specified for use with this test method.

Based on the original curing design, a series of improvements have been made to the overall appearance and internal structure of the equipment. The cabinet door is sealed with magnetic sealing strips. A refrigeration system, humidification system, and dehumidification system are installed inside the cabinet. The equipment features an attractive design, precise temperature and humidity control, and reliable performance.

II. Technical Specifications

1. Temperature Control Range: 15–30°C

2. Temperature Measurement Accuracy: ±1°C

3. Humidity Control Range: 40–80% RH

4. Humidity Control Accuracy: ±5% RH

5. Resolution: ≤0.2°C

6. Temperature Uniformity: ±1°C

7. Heating Power: 1000 W

8. Refrigeration Power: 200 W

9. Humidification Power: 35 W

10. Refrigeration Power: 200 W

11. Dehumidification Power: 90 W

12. Overall Dimensions: 1135 mm × 645 mm × 1565 mm

13. Internal Dimensions: 700 mm × 500 mm × 1200 mm

14. Operating Environment: 0–35°C

15. Voltage: 220 V ±10 V

16. Power Frequency: 50 ±1 Hz

III. Working Principle and Structure

3.1 Structure

The cabinet consists of inner and outer layers. The outer cabinet is made of high-quality cold-rolled steel plates, while the inner chamber is constructed from imported acid- and alkali-resistant stainless-steel plates or plastic panels. The partitions are made of aluminum alloy profiles, providing good corrosion resistance.

The inner chamber is primarily designed for heating and auxiliary humidification. The humidification system mainly uses an ultrasonic humidifier, with a dry-burning heating tube serving as an auxiliary heating element. The heating and humidification functions switch automatically according to the control requirements. The temperature and humidity inside the cabinet are displayed digitally on the control instrument.

3.2 Working Principle

Temperature Control: When the temperature inside the cabinet is lower than the set value of the temperature controller, the controller outputs a heating signal to activate the electric heating element. Conversely, when the temperature exceeds the set value, the controller activates the refrigeration system. When the temperature reaches the required level, the heating or refrigeration operation automatically stops.

Humidity Control: An ultrasonic humidifier is used to increase the humidity inside the cabinet, ensuring that the required test conditions are achieved. Humidification and dehumidification are automatically controlled by the temperature and humidity controller. When the relative humidity reaches the required test value, the controller activates the humidification or dehumidification system as needed. Once the humidity reaches the specified differential value, the corresponding system automatically stops operating.

3.3 Instructions for Using the Temperature and Humidity Automatic Controller

1. Temperature Measurement Range: 15–30°C

2. Temperature Measurement Accuracy: ±1°C

3. Humidity Measurement Range: 40–80% RH

4. Humidity Measurement Accuracy: ±5% RH

5. Automatic Clock: Equipped with an automatic clock function

6. External Control Settings: Control parameters can be set externally

7. Timed Printing Output: The printing time can be set externally for printout

8. Applicable Environment: ≤50°C; ≤85% RH