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Calorímetro Langavant semiadiabático

LANGAVANT CALORIMETER for heat of hydration of cements

Computer assisted calorimeter, for the automatic determination of the the heat of hydration of hydraulic cements, according to EN 196-9, including automatic data collection and performing of calculations.

This equipment comprises a computerized system for the automatic data acquisition during the test.

Test data can be managed by means of a specific test software WinLec32 (Test-Lang version), developed specifically by the IBERTEST R&D department for this instrument, according to the Langavant method as indicated in the standard EN 196-9.

The system automates the data adquisition and performs the calculations required by computer, thus avoiding possible errors in the manual data collection, providing
test results always reliable and reproducible.

The test results are stored on computer files and can be retrieved at any time for reporting, comparison, statistical analysis, etc.

040 Heat Of Hydration - Langavant
Consultation or budget requests

Product Description

Introducing Langavant method for determine the heat of hydration of cements.

Langavant method consists of introducing a fresh cement speciment into a isolated Dewar flask and monitoring the temperature changes within the specimen during the first early days.

After a certain time, the heat of hydration of the cement content in the sample is equal to the sum of the heat accumulated in the flask and the heat emitted to the environment during the test period.

The temperature of the mortar is compared with the temperature of a inert sample placed in a reference calorimeter flask .

The amount of heat achieved by the cement mortar is mainly dependent on the nature thereof, and may reach values ??between 10 ° C and 50 ° C.

The amount of heat is expressed in joules per gram of cement.

Needed equipment

To perform the test you need:

  • Calorimetric test bottle, designed to contain the sample of cement mortar.
  • Calorimetric reference bottle, containing a mixed mortar at least 12 months before and is considered inert. If not available, use an aluminum cylinder of the same thermal capacity of the sum of mortar box and mortar sample.
  • A mortar box (disposable after each test)
  • Two thermometers or temperature recorder
  • A planetary mixer according to EN 196-1

Test conditions

  • The temperature of the test room must be 20 ± 2 ° C.
  • Near the calorimeters, the ambient temperature must be between 19 and 21 ° C and remain stable within ± 0.5 ° C.
  • Room temperature measurement is obtained using the reference calorimeter.
  • The ventilation air velocity in the vicinity of calorimeters must be less than 0.5 meters per second.
  • The heat sources and the ventilation openings near the calorimeters must be eliminated.

Specimen mortar composition

  • Cement: 350 g
  • Sand: 1050 g  (must be normalized sand as per/ EN 196-1)
  • Water (distilled): 175 g
  • Total weight: 1575 g

The most common is to perform multiple tests simultaneously. In this case it uses a reference bottle for testing up to 6 calorimeters.

Make an hexagonal arrangement with the reference calorimeter in the center and respecting equal distance between them.

Calorimeter bottle features

For good results, the calorimeter bottle must be perfectly calibrated and meet all requirements of the test standard EN 196-9.

In order to perform the calculations of the standard procedure, each IBERTEST Langavant calorimeter bottle is checked and verified individually and incorporates a plaque indicating:

  • heat loss coefficient
  • calorific mass

Each bottle is delivered with its individual calibration certificate, made ??and issued by the “Laboratoire Regional de Ponts et Chaussees”

Dewar Flask Features

Made of plated borosilicate glass with hemispherical bottom
Includes an insulating cap and a rubber disc of 85 mm diameter and 20 mm thick, which supports the sample container and distributes the load evenly against the glass wall.

  • Inner Diameter: 95 mm
  • Outer diameter: 120 mm
  • Depth: 280 mm

Dewar Flask housing 

Ready to be placed inside the Dewar described above.

Made of duralumin (3 mm thickness), high rigidity and sturdy wide base ensures good stability.
The Dewar flask is separated from the sidewalls of the housing by an air gap of about 5 mm and rests on a support of about 50 mm thick.
The upper edge of the glass Dewar is in contact with a cap, crown-shaped, 5 mm thick, being so tied up in its accommodation. The crown locking provides a support surface of the glass stopper and ensures tightness.
Both the glass support and the crown-locking are made of very low thermal conductivity material.

Insulating cover, divided in 3 parts

  1.  Lower part: It’s inserted into the vessel and limit heat loss.
  2. Central part. Consists of a disc made of foam rubber, 120 mm in diameter, which ensures the tightness of the calorimeter.
  3. Upper part. It consists of a hard case, with locking device that compresses the foam rubber disc of the central part, ensuring the sealing of the lid and the correct positioning of the cover of the Dewar flask.

Mortar Box

The mortar box is a capped cylindrical box, suitable for content the cement sample during the test, the mortar box is disposable after each test.

IBERTEST mortar boxes are made of tinplate of 0,3 thickness, electrically weld.

Features:

  • Diameter: 80 mm
  • Heigth: 165 mm
  • Aprox. capacity. 800 cm3
  • Water-vapourtight at 0,3 bar pressure

In the middle of the cap, there is a cylindrical thermometer box, closed at the bottom. The inner diameter of the box is slightly larger than the diameter of the thermometer.

The length can vary from 100 to 120 mm, so that the thermometer box can reach the heart of the test tube.

The mortar box must be absolutely water-vapourtight. The water-vapourtightness is controlled by weighing the mortar box after each test.

Temperature probe

IBERTEST temperature probes are resistance type Pt 100 (100 ? platinum), isolated with a plastic film of very low thermal conductivity.

Each probe is provided with a ENAC calibration certificate. The ENAC certification is widely recognized. The verification is issed with calibrated instruments, traceable to international temperature standards.

Electronic data acquisition module

Comprises 4 measuring channels for connecting Pt-100 probes (allowing the connection up to 3 test calorimetric bottles and 1 reference bottle, according stated in the standard)

Under request, IBERTEST can supply electronic modules for connecting up to 7 temperature probes. (Ask our Sales Staff).

Technical features:

  • RS-232 port for PC connectionConverter A/D of 16 bits.
  • Linearity: ± 0,1% F.E.
  • Thermal drift: ± 0,01%/ºC a F.E.
  • Protocol: MODBUS RTU/ASCII
  • Sampling rate: 0,5 – 2 readings/second (on depending of the number of simultaneous reading channels)
  • Isolation to 2000 VCA (3 vías)
  • Influence of the R line: 0,05% ? (50 ? max, balanced).
  • Exiting current: 0,350 mA.
  • Data transfer speed: max 38,4 Kbps. Maximum distance: 1,2 Km.
  • Compliance with: EN standards.Electromagnetic (CEE/336/89).Immunity EN 61000-6-2.Emissivity EN 61000-6-4

Data acquisition software WINTEST.LANG

Data acquisition software, running on Windows®

  • Fully developed by IBERTEST for the Langavant test.
  • Suitable for measuring up to 8 channels at the same time.
  • Allows a continuous reading of the reference heat and the amount of heat transmitted by the samples placed in the test.It calculates the hydration heat of each sample showing the test results graphics according with the standard
  • Full free parameterization of tests, samples data, etc.
  • Real time graphics for temperature/time.

Standard Supply

  • Set of 2 isolated calorimeter bottles (one for reference), supplied with official calibration certificate.
  • Set of 2 temperature probes type Pt-100, with 3 threads, supplied with official calibration certificate.
  • Set of 50 disposable mortar box.
  • Electronic console, with 4 measuring channels, and RS232 output interface for connecting up to 4 calorimeter bottles to the PC (3 for testing + 1 for blank reference).
  • Next-generation PC (dual-core microprocessor or higher), keyboard, mouse, TFT 20 widescreen, Windows ® operating system manuals and licenses.
  • WinLec32 IBERTEST Software License (Version Test-Lang), Windows ®, preinstalled on the provided PC.
  • Printer colour inkjet.

Optional accessories

Additional isolated calorimeter bottles, supplied with official calibration certificate.

  • Set of 50 disposable mortar boxes.
  • Aluminum cylinder: to be used as reference instead of the inert cement.
 Computerized Langavant calorimeter
Reference111-101238
Dewar flask Manufactured in borosilicate glass, hemispherical bottom. Inner diameter: 95 mm Overall diameter: 120 mm Depth: 280 mm Includes a plug insulator and a rubber disc (Ø 85 mm - 20 mm thickness), which supports the sample container and evenly distributes the load on the glass wall.
Dewar housingReady to place inside the Dewar described above. Made of duralumin (3 mm thickness), high rigidity and sturdy wide base ensures good stability. The Dewar flask is separated from the sidewalls of the housing by an air gap of about 5 mm and rests on a support of about 50 mm thick. The upper edge of the glass Dewar is in contact with a cap, crown-shaped, 5 mm thick, being so tied up in its accommodation. The crown locking provides a support surface of the glass stopper and ensures tightness. Both support the glass and the crown locking are made of a material with low thermal conductivity.
Insulation coverIt’s inserted into the vessel and limit heat loss. Central part. Consists of a disc made of foam rubber, 120 mm in diameter, which ensures the tightness of the calorimeter. Upper part. It consists of a hard case, with locking device that compresses the foam rubber disc of the central part, ensuring the sealing of the lid and the correct positioning of the cover of the Dewar flask.
Disposable mortar tinsIntended to receive the cement mortar sample to be tested, discarded after the test. Manufactured standard sheet of 0.3 mm thick. Diameter: 80mm Height: 165 mm Approx. volume: 850 cm3 Steam-tight at a pressure of 0.3 bar. In the middle of the tin lid, a tube is located to insert the measurement element (thermopar, Pt 100 probe, or thermometer). It is approximately 100 to 120 mm long, in order to reach the central inner part of the specimen.
Electronic module4 measuring channels for Pt-100 probes (allowing the connection up to 3 test calorimetric bottles and 1 reference bottle, according stated in the standard). Up to 24 additional modules can be linked, to measuring up to 96 temperature probes. USB port for PC connection 16 bits A/D converter. Linearity: ± 0,1% F.E. Thermal drift: ± 0,01%/ºC a F.E. Protocol: MODBUS RTU/ASCII Sampling rate: 0,5 - 2 readings/second (*) Isolation to 2000 VCA (3 vías) Influence of the R line: 0,05% ? (50 ? max, balanced). Exiting current: 0,350 mA. Data transfer speed: max 38,4 Kbps. Compliance with: EN standards: Electromagnetic (CEE/336/89). Immunity EN 61000-6-2. Emissivity EN 61000-6-4
Data acquisition software WIN-TEST.LANG Exclusivelly developed by IBERTEST for the Langavant test. Suitable for measuring up to 8 channels at the same time. Allows a continuous reading of the reference heat and the amount of heat transmitted by the samples placed in the test.It calculates the hydration heat of each sample showing the test results graphics according with the standard Full free parameterization of tests, samples data, etc. Real time graphics for temperature/time.
Power supplySingle-phase  220-230 V ~ 50/60 Hz