Langavant Calorimeter: Cement Tests
How it Works
The Langavant Calorimeter is a sophisticated semi-adiabatic testing system designed to measure the heat of hydration in fresh mortar. At the heart of this system are the test calorimeter and the reference calorimeter, which work in tandem to provide accurate temperature readings. The test calorimeter measures the temperature changes in the mortar sample, while the reference calorimeter monitors an inert sample to account for environmental heat exchange.
Temperature recorded and stored values from both calorimeters are meticulously recorded and stored using a temperature recording device. This device is connected to a data acquisition module, enabling automatic data acquisition and seamless storage of test data. The Langavant method involves placing a fresh cement specimen into an isolated Dewar flask, where temperature changes are closely monitored over the initial days. The heat of hydration is calculated as the sum of the heat accumulated in the flask and the heat emitted to the environment during the test period. By comparing the temperature of the mortar with that of the inert sample in the reference calorimeter flask, precise measurements are ensured.
Langavant Method
The Langavant method is a popular semi adiabatic method to measure the heat of hydration of cement, mortar and grout. A fresh cement specimen is placed in an isolated Dewar flask and the temperature inside the specimen is monitored for the first few days. The heat of hydration of the cement in the sample is equal to the heat accumulated in the flask plus the heat lost to the environment during the test period. The heat achieved by the cement mortar is influenced by its nature and is a crucial parameter in understanding the hydration process. The Langavant method is a reliable way to measure the heat of hydration which is a key parameter to understand the behavior of cement based materials.
Reference Calorimeter and Accessories
The Langavant calorimeter set consists of a calorimeter, a data box and a set of accessories. The calorimeter is semi-adiabatic and consists of a thermos vessel with a thermally insulating closure and a stable aluminum housing. The data box is for automatic data acquisition and has 4 channels for Pt-100 probes. The accessories include a reference calorimeter flask, a mortar container and a thermometer fitting. The system comes with a factory calibration certificate so the equipment is guaranteed to be accurate and reliable.
Testing and Automatic Data Acquisition
The testing procedure is to place a fresh mortar sample in the calorimeter and measure the heat released based on the temperature development. The heat achieved by the cement mortar is a critical result obtained from this testing procedure. The temperature recorded and stored values are recorded and stored in the data box which allows automatic data acquisition. The system also allows manual data collection and the recorded values can be stored and analyzed using the reporting and editing function. The testing procedure is according to EN 196-9 and the system meets the requirements of this standard.
Test Procedure
The testing procedure consists of placing a fresh mortar sample into the calorimeter, where the heat released is determined based on the temperature development observed. The setup includes a reference calorimeter to measure temperature changes in an inert sample, ensuring accurate comparison and compensation for environmental factors.
Temperature recorded and stored values are recorded and stored using a temperature recording device, which is connected to a data acquisition module. This setup allows for both automatic and manual data collection, ensuring flexibility and precision in capturing the test data. The procedure adheres to the specifications outlined in EN 196-9, which governs the testing of cement mortar. By analyzing the temperature development, the heat of hydration of the cement mortar is calculated, providing critical insights into the material’s behavior.
Conforms to: EN 196-9
The calorimeter set meets the requirements of EN 196-9 which is the European standard for heat of hydration of cement. The system is calibrated for accuracy and reliability and comes with a factory calibration certificate. The system also meets other international standards so it’s a universal and widely accepted testing solution.
Technical Specifications and Performance
The calorimeter set has the following technical features: Calorimeter: 100 mm x 240 mm, thermally insulating material. Data box: 4 channels, can connect up to 4 Pt-100 probes. Temperature sensor: Class A according to DIN 60751. Software: Windows NT/2000/XP, statistical analysis and reporting.
Applications and Features
The calorimeter set is used in the construction industry for testing heat of hydration of cement, mortar and grout. In research and development it is used to study cement based materials. The benefits of the calorimeter set are: accurate and reliable results, automatic data acquisition and user friendly interface. The system accurately measures the heat achieved by the cement mortar, providing valuable insights for research and development. The system is universal and can meet the requirements of different international standards.
Support and Resources
Qualitest International Inc. offers comprehensive support and resources for users of the Langavant Calorimeter. Each system comes with a factory calibration certificate, ensuring the equipment’s accuracy and reliability. Additionally, a detailed user manual is provided to guide users through setup and operation.
For ongoing support, Qualitest offers technical assistance and training services to ensure the system operates correctly and efficiently. The Langavant Calorimeter also features a robust reporting and editing function, allowing users to analyze and edit test data with ease. The included statistical analysis function enables detailed examination of the test data, facilitating thorough and accurate assessments.
Additional resources, including user manuals and technical specifications, are readily available on the Qualitest International Inc. website. For any questions or issues, customers can reach out to the company’s technical support team, ensuring they have the help they need to make the most of their Calorimeter.
Conforms to: EN 196-9 for heat of hydration
Measures heat of hydration of cement by semi-automatic Langavant method. Test calorimeter comes with factory calibration certificate. Temperature recorder has (4) input channels for recording and transmission of temperature values. Analysis software has reporting and editing function for calculating heat of hydration. Unit includes: test calorimeter; reference calorimeter; mortar-sample container, temperature recording device and analysis software. Power for unit is from USB from a PC or laptop. PC not included.
Meets Test Methods:
ASTM EN 196-9
