Supersulphated cement ? specification — IS 6909 (1990) Testing

IS 6909:1990 is used for specifying and evaluating the quality of supersulphated cement. The standard covers requirements related to its composition, manufacture and testing, helping manufacturers assess whether the cement meets defined chemical and physical performance requirements.

Supersulphated cement is suited to applications where resistance to aggressive environments is important. BIS references its use in marine works, concrete exposed to aggressive water, sulphate-bearing soils, reinforced concrete pipes and certain chemical or industrial environments.

Testing associated with IS 6909:1990 includes chemical requirements, fineness, soundness, initial and final setting time, and compressive strength at specified ages. BIS LIMS also lists parameters such as insoluble residue, magnesium oxide, sulphuric anhydride and sulphide sulphur.

Fineness testing for supersulphated cement under the IS 6909:1990 testing scope is carried out with reference to IS 4031 Part 2. The test helps evaluate the particle fineness of the cement, which is an important physical characteristic for assessing conformity.

Setting time testing for supersulphated cement under IS 6909:1990 is referenced to IS 4031 Part 5. The testing scope includes both initial and final setting time, allowing laboratories to assess the cement's setting characteristics against the applicable requirements.

Compressive strength testing under the IS 6909:1990 scope is referenced to IS 4031 Part 6. BIS LIMS lists measurements at 72 hours, 168 hours and 672 hours, providing a basis for evaluating strength development of supersulphated cement.

Chemical evaluation under the IS 6909:1990 testing scope includes insoluble residue, magnesium oxide, sulphuric anhydride and sulphide sulphur. BIS LIMS specifies relevant test methods through referenced BIS standards, supporting consistent laboratory evaluation of chemical requirements.

The BIS product manual for IS 6909:1990 specifies a sample size of 8 kg for physical tests and 1 kg for chemical tests. Proper sample preparation and handling are important to obtain representative laboratory results for conformity assessment.