The heat of hydration of cement refers to the heat released during the hydration process of cement, which has a significant impact on the construction and quality control of mass concrete structures. Accurate determination of cement heat of hydration is essential for ensuring the durability and safety of concrete structures. International standards such as ASTM and EN, as well as relevant testing methods, provide standardized requirements and guidelines for the measurement of cement heat of hydration.

I. Overview of Cement Heat of Hydration Tester

The Direct Method Cement Heat of Hydration Tester is a specialized instrument designed for measuring the heat of hydration of cement. After a comprehensive system upgrade, the equipment features simpler operation, improved convenience, and a more user-friendly design.

The instrument has been optimized as a whole, with multi-channel temperature sensors installed on the front side of the water bath. This design shortens the signal transmission path, improves temperature acquisition speed, and enhances measurement sensitivity.

During the test, changes in heat values are collected in real time through the multi-channel data acquisition system and transmitted to a computer. The software automatically calculates the total amount of accumulated and dissipated heat inside the calorimeter, and determines the heat of hydration of cement at different ages, such as 3–7 days or 28 days. The system also allows users to view heat of hydration results at any selected time.

In addition, the instrument supports independent operation and calculation of individual channels, enabling multiple tests to be conducted efficiently and flexibly.

II. Applicable Standards

The TD12595-B Series Cement Heat of Hydration Tester not only complies with the GB/T 12959-2024 standard but also meets the requirements of various international and industry standards, including:

ASTM C186-1998 — Standard Test Method for Heat of Hydration of Hydraulic Cement

EN 196-9:2003 — Methods of testing cement — Heat of hydration — Semi-adiabatic method

SL/T 352-2020 — Test Code for Hydraulic Concrete

JTG 3420-2020 — Test Methods of Cement and Concrete for Highway Engineering

DL/T 5150-2017 — Test Code for Hydraulic Concrete

JTS/T 236-2019 — Technical Specification for Testing and Inspection of Concrete in Port and Waterway Engineering

With compatibility with multiple testing standards, this series of instruments can be widely applied in engineering testing, quality control, and research projects across different regions and industries.

III. Practical Applications

1. Cement Manufacturing Companies

Cement manufacturers can use the TD12595-B Series Cement Heat of Hydration Tester to evaluate the heat of hydration of produced cement and ensure that product quality meets the requirements of relevant standards. By accurately measuring cement heat of hydration, manufacturers can optimize production processes, adjust cement formulations, and develop cement products that better meet the requirements of different engineering applications.

2. Concrete Engineering Projects

In mass concrete projects, such as large bridges, high-rise buildings, and hydraulic and hydropower engineering structures, excessive heat of hydration may cause a significant increase in internal concrete temperature, resulting in thermal cracking and affecting the durability and safety of concrete structures.

Using the Cement Heat of Hydration Tester allows engineers to accurately determine the heat of hydration of cement, providing scientific data support for concrete mix design and construction planning. This helps effectively reduce the risk of temperature cracking and improve the long-term performance of concrete structures.

3. Research Institutions

Research institutions can use the TD12595-B Series Cement Heat of Hydration Tester to conduct scientific studies related to cement hydration heat. The instrument enables researchers to investigate the effects of different factors on cement heat of hydration, explore advanced hydration heat control technologies, and provide theoretical support for technological development and innovation in the cement industry.

IV. Advantages of the Cement Heat of Hydration Tester

1. Easy Operation

After the system upgrade, the Cement Heat of Hydration Tester features fully automatic operation, providing a simpler, more convenient, and user-friendly testing experience. Users only need to follow the software instructions to complete the testing process, which reduces operational complexity and improves work efficiency. Even beginners can quickly learn and operate the equipment with ease.

2. High Measurement Accuracy

2.1 Multi-Channel Temperature Sensors

The multi-channel temperature sensors are installed on the front side of the water bath, which shortens the signal transmission path and provides faster temperature acquisition speed with higher sensitivity. The sensors can collect temperature changes inside the calorimeter in real time and with high accuracy, providing reliable data support for precise calculation of cement heat of hydration.

2.2 High-Precision Data Acquisition System

The multi-channel data acquisition system features high resolution (±0.001°C) and high accuracy (±0.005°C). The data sampling interval can be flexibly set from 1 second to 1 hour according to testing requirements. It can accurately capture minor temperature variations, ensuring the accuracy and reliability of measurement results.

2.3 Automatic Software Calculation

The heat of hydration analysis software automatically calculates the total amount of accumulated and dissipated heat inside the calorimeter, providing cement heat of hydration results at 3–7 days or 28 days. Users can also check hydration heat results at any selected time during the test period. This eliminates complex manual calculations, reduces human errors, and significantly improves the accuracy and reliability of the test results.

3. Powerful Functions

3.1 Independent Single-Channel Operation

The instrument supports independent operation and calculation for individual channels, allowing users to perform comparative tests on different samples. This improves testing flexibility and enables more targeted analysis according to specific testing requirements.

3.2 Multi-Channel Testing Capability

The system is available in multiple configurations, including 4-channel (TD12595-B4), 8-channel (TD12595-B5), 12-channel (TD12595-B6), and 16-channel (TD12595-B12) models. Multiple samples can be tested simultaneously, significantly improving testing efficiency and making the instrument suitable for batch sample analysis.

3.3 Automatic Temperature Correction

The heat of hydration analysis software features an automatic temperature correction function with a 7-point calibration range. It can automatically compensate for temperature deviations during the measurement process, further improving the accuracy and reliability of test results.

4. Excellent Equipment Stability

4.1 Ultra-Low Temperature Circulating Thermostatic Water Bath

The circulating thermostatic water bath is directly controlled by computer software and can be used not only as a curing bath but also as a constant-temperature water bath for various laboratory applications. The system is available with 8 sample positions as standard, with customization options for 32–48 positions according to user requirements.

The temperature control system adopts fully automatic computer control. Heating is achieved through electric heating tubes, while cooling is provided by a compressor refrigeration system. The temperature range of the water bath is 10–90°C, with low-temperature customization available down to -40°C. Temperature control accuracy can reach ±0.1°C (customizable up to ±0.005°C).

The heating and cooling capacities are properly configured according to the number of testing channels. With operating noise below 50 dB, the system provides a stable and reliable temperature environment for testing, ensuring accurate and repeatable test results.

4.2 UPS Uninterruptible Power Supply

The equipment is equipped with a UPS uninterruptible power supply with a rated capacity of 650VA/390W and a voltage regulation range of 145–275V. The net weight of the unit is 4.9 kg, and the battery can be fully charged within 8–12 hours.

Both the input and output voltages are 220V AC. The UPS uses a 12V 7.5Ah × 1 battery, with high-quality branded batteries available, such as Leoch, Aokly, and Hengli. The product complies with various certifications, including CE, MSDS, marine transportation certification, and inspection reports. The operating noise is below 40 dB.

The UPS can provide stable power supply for the computer system for at least 35 minutes, allowing the test to continue without interruption during short-term power failures. This ensures the continuity of the testing process and the integrity of the collected data.

V. Conclusion

The Cement Heat of Hydration Tester has broad application prospects and significant advantages. It can accurately and efficiently determine the heat of hydration of cement, providing reliable testing solutions for cement manufacturers, concrete engineering projects, and research institutions.

With features including easy operation, high measurement accuracy, powerful functions, excellent equipment stability, and convenient data management, the instrument demonstrates strong competitiveness in the field of cement heat of hydration testing.

With the continuous development of the cement industry and concrete engineering technologies, the TD12595-B Series Cement Heat of Hydration Tester will play an increasingly important role in ensuring engineering quality, supporting material research, and promoting technological innovation.