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Using a TGA Machine to Measure LOI in Cement
Loss on Ignition (LOI) is a critical parameter in assessing the quality and composition of cement. It measures the percentage of volatile substances – including moisture, carbon dioxide, and organic compounds – released when the cement is heated to a high temperature. This blog will detail the step-by-step procedure to measure LOI using a thermogravimetric analyzer (TGA), ensuring accurate and reliable results in compliance with ASTM C150 standards.
Obtaining a LOI Measurement From a Thermogravimetric Analyzer
1. Weighing the Empty Crucible
The first step in ascertaining an LOI measurement with a thermogravimetric analyzer is to weigh an empty crucible and record its mass. This initial mass is essential for accurately determining the
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How to Use a Thermogravimetric Analyzer to Measure Loss on Mass in Alumina
Thermogravimetric analysis (TGA) is a vital technique for analyzing the thermal stability and composition of materials by measuring the mass change as a function of temperature. In the context of alumina (Al₂O₃), TGA helps identify thermal events such as dehydration, dehydroxylation, and decomposition of impurities. This article provides a detailed procedure for using a thermogravimetric analyzer to measure the loss on mass in alumina, incorporating specific considerations for accurate and reliable results.
Materials and Equipment
- Thermogravimetric Analyzer (TGA)
- Alumina Sample
- Crucible (typically made of platinum or alumina)
- Balance for initial weighing
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Using TGA Instruments for LOI in Solid Combustion Residues
Thermogravimetric analysis (TGA) has become essential for determining the loss on ignition (LOI) in solid combustion residues such as coal ash, biomass ash, and cement residues. LOI is a critical parameter in assessing the quality and usability of these residues, referring to the mass loss when the sample is heated in an air or oxygen atmosphere to high temperatures, typically around 750°C or 950°C.
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