IS 1344 (1981) specifies requirements for Calcined Clay Pozzolana used as a pozzolanic material in cement and construction applications. The standard covers raw materials, manufacturing, physical requirements, sampling, testing, storage and delivery. Calcined clay pozzolana conforming to IS 1344 is also used in Portland Pozzolana Cement under applicable BIS requirements. Certko provides laboratory testing support through suitable BIS-recognised laboratories to help businesses assess product conformity and prepare testing documentation for Indian market compliance.
Chemical Testing
Specification for Calcined Clay Pozzolana — IS 1344 (1981) Testing
IS 1344 (1981) is a BIS product testing standard for cement & construction materials (1 notified product). Book laboratory testing required for ISI Mark / CRS certification.
IS · India
IS (Indian Standards) — typically accepted in India. Bureau of Indian Standards test methods — primary evidence for BIS / India market compliance and many domestic buyer specs.
- Product category
- Cement & Construction Materials
- Main standard
- IS 1344 (1981)
- Test type
- Chemical / composition
- Accreditation
- ISO/IEC 17025 / NABL (BIS-recognised labs)
- Testing timeline
- 7–12 working days
- Sample size required
- 100–500 g representative sample (or as per IS)
- Tentative testing price
- ₹26K
Indicative BIS lab charges from product records — confirm with the laboratory.
BIS products tested to this standard
1 BIS-notified product map to IS 1344 (1981) — open a product for scheme, labs and indicative costs.
FAQs about Specification for Calcined Clay Pozzolana — IS 1344 (1981) Testing
Q1. What are the grades specified in IS 1344:1981?
IS 1344:1981 specifies Grade I and Grade II calcined clay pozzolana. The grades are differentiated primarily by physical performance requirements such as fineness and lime reactivity. Grade I requires a minimum specific surface of 320 m²/kg and lime reactivity of 4.0 N/mm², while Grade II requires 250 m²/kg and 3.0 N/mm² respectively.
Q2. What are the chemical requirements under IS 1344:1981?
The standard specifies limits for important chemical characteristics of calcined clay pozzolana, including magnesium oxide, sulphuric anhydride, total alkalis, water-soluble alkali, water-soluble material and loss on ignition. These requirements help assess the suitability and consistency of the material for its intended cementitious applications.
Q3. What is the fineness requirement for calcined clay pozzolana?
According to the physical requirements of IS 1344:1981, the minimum specific surface measured by the Blaine permeability method is 320 m²/kg for Grade I and 250 m²/kg for Grade II. Fineness is important because it influences the reactivity and performance of the pozzolanic material.
Q4. What is lime reactivity in IS 1344:1981 testing?
Lime reactivity is a key performance parameter for calcined clay pozzolana. IS 1344:1981 specifies minimum average compressive strength values of 4.0 N/mm² for Grade I and 3.0 N/mm² for Grade II, helping evaluate the pozzolanic activity of the material.
Q5. What is the drying shrinkage requirement under IS 1344:1981?
IS 1344:1981 specifies maximum drying shrinkage requirements for the two grades. The limit is 0.15 percent for Grade I and 0.10 percent for Grade II. This test helps evaluate dimensional stability and supports assessment of the material's suitability for construction applications.
Q6. Which standard is used for testing calcined clay pozzolana?
Samples of calcined clay pozzolana covered by IS 1344:1981 are tested in accordance with IS 1727:1967, Methods of Test for Pozzolanic Materials. The standard also references IS 12870:1989 for methods of sampling calcined clay pozzolana.
Q7. What is the sampling standard for IS 1344:1981?
Sampling of calcined clay pozzolana is covered by IS 12870:1989, Methods of Sampling Calcined Clay Pozzolana. Proper representative sampling is important because laboratory results depend on the sample accurately representing the material supplied for testing.
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