Calmetrix I-Cal Ultra Isothermal Multi-Channel Cement Calorimeter
Calmetrix I-Cal Ultra Isothermal Multi-Channel Cement Calorimeter
The calorimeter for determining heat of hydration and for online analysis of the setting behaviour of hydraulic binders such as cement, etc.The Calmetrix I-Cal Ultra is a multi-channel heat-flux calorimeter designed for the cement industry and construction chemicals sector. It has been developed for both quality assurance and R&D applications. Thanks to its flexible test configuration – for example, in the choice of measuring cells – as well as its ease of operation and data analysis via intuitive software, it is rapidly becoming the standard method in laboratories and pilot plants. Within a temperature range of 4 to 90°C, the user can operate up to 8 measurement channels in parallel and independently of one another. Typical sample weights range from 2 to 10 g of binder/aggregate, with water-to-cement ratios of less than 0.3.
Product Description
Hydraulic binders such as cement react exothermically with water during setting. The hydration enthalpy released correlates with the strength values of the cement. These enthalpies are determined by means of calorimetry; modern heat flow calorimeters record this heat development in a user-friendly manner and online. They thus provide valuable qualitative and quantitative information on the time course and intensity of the reactions taking place. For this reason, heat flow calorimetry has become a standard technique in the cement industry and construction chemistry. Another advantage of this technique is that it does not require the use of hydrofluoric acid (EN 196-8).
The Calmetrix I-Cal Ultra cement calorimeter works as a heat flow calorimeter with measurement of a local temperature difference between the sample (reactive) and a reference (inert) in a temperature-constant environment. The sample (e.g. freshly prepared cement paste) is weighed into a glass or plastic ampoule (up to 20 ml volume) and placed in the calorimeter. Typical measurements take a few hours up to 7 days (LH cements). Special mixing cells are available to measure the heat tint immediately after adding the mixing water.
The Calmetrix I-Cal Ultra cement calorimeter can be individually configured with up to 8 measuring channels with max. 20 ml. It is fully compliant with the ASTM C1679, ASTM C1702, ASTM C563 and EN 196-11 standards and has fully thermally isolated measuring stations (no cross-talk visible), each of which is coupled with a variable reference in twin design. The calorimeter is operated with the application-orientated CalCommander software from Calmetrix. The individual software modules control the measurement and enable the generation of reports as well as the calculation of the setting time and strength, the optimisation of the sulphate content, the calculation of the activation energy and the quantitative determination of the heat of hydration in accordance with ASTM C1679 and ASTM C1702. Once started, the heat of hydration is recorded online. The measurement data thus provides both qualitative and quantitative information on the time course and extent of the reactions taking place as well as the hydration enthalpy released.
If larger sample quantities are required, the three HPC models I-Cal 2000 HPC with two, the I-Cal 4000 HPC with four or the I-Cal 8000 HPC with eight measuring stations and a sample volume of 125 ml each can be a good alternative.
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Specifications
Sample volume: up to approx. 20 mlTemperature range: 4–90°C
Temperature stability: ± 0.01°C
Temperature accuracy: ± 0.4°C
Detection limit: 2 µW
Accuracy: ± 2 µW
Baseline
stability over 24 hours:
Drift over 24 hours: < 5 µW
Deviation: < ± 1 µW
Error: < ± 10 µW
Mains connection: 230 V / 50 Hz
Dimensions: 50 cm x 40 cm x 108 cm (L x W x H)
Weight: 34 kg
Compliance with standards: ASTM C1679, ASTM C1702, ASTM C563 and EN 196-11
Options and Accessories
• Optional CalCommander software packages
• 20 ml plastic vessels with screw caps
• 20 ml mixing cell with drive and accessories
Applications
• Investigation of the interaction between binders and admixtures (retarders / accelerators / superplasticisers)
• Quantitative determination of hydration heat (e.g. in LH cements) and determination of the
degree of hydration• Investigation of reactivity / setting time as a function of temperature and/or the addition of
admixtures• Optimisation of the CaSO₄ content
