This standard specifies the methods for conducting the chemical analysis of various types of hydraulic cements. It outlines the step-by-step procedures for determining critical chemical parameters like loss on ignition, silica, insoluble residue, calcium oxide, magnesia, and chlorides, which are essential for evaluating cement quality and compliance with Indian Standards.
Specifies various methods for the chemical analysis of different constituents present in hydraulic cement.
Quick Reference Values
LOI ignition temperature900 to 1000 °C
LOI ignition time15 minutes (or until constant weight)
IR drying temperature105 to 110 °C
IR ignition temperature900 to 1000 °C
standard cement sample weight1.000 g (for most general analyses)
chloride determination sample weight5.0 g
Key Formulas
Loss on ignition, percent by mass = [(W1 - W2) / W1] x 100 (where W1 is initial mass, W2 is ignited mass)
Insoluble residue, percent by mass = (W / W1) x 100 (where W is mass of residue, W1 is mass of sample)
SO3 content, percent by mass = (W x 34.3) / W1 (where W is mass of barium sulphate)
Practical Notes
Always use analytical reagent (AR) grade chemicals and distilled water to prevent contamination during tests.
Ensure the muffle furnace is accurately calibrated; incorrect temperatures will lead to faulty Loss on Ignition (LOI) and Insoluble Residue (IR) results.
Crucibles must be properly cooled in a desiccator before being weighed on the analytical balance to avoid buoyancy and moisture errors.