Loss on ignition
The loss on ignition of a raw material, cement or a clinker sample is the amount of weight lost through raising the temperature of the material to a predetermined level. As an indicator it can be used to monitor and improve the quality of the final product.
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Clinker stored outside in wet conditions will experience an increase in LOI
Weight loss during heating can be due to the evaporation or volatilisation of a variety of components of the sample. Water is lost at 100-105˚C, organic material is burned off at about 550˚C and most of the carbonates can be lost between 800- 1000˚C.