1. Scope
This national standard has regulated the definition and code number of the Portland cement and ordinary Portland cement, material requirements, strength level, specifications, test methods, test rules, packaging, sign, transportation and stock.
2. Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this national standard. At time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB/T176-1996 Method for Chemical Analysis of Cement (eqv ISO680:1990)
GB/T203-1994 Ground Granulated Blast Furnace Slag Used for Cement (neq TOCT 3476:1974)
GB/T750-1992 Test Method for Cement Press Stability
GB/T1345-1991 Test Method for Cement Fineness by the 80μm Sieve Analysis Method
GB/T1346-1989 Test Method for Cement Water Consumption of Standard Consistency, Setting Time and Invariability (neq ISO/DIS 9597)
GB/T1596-1991 Fly Ash Used for Cement and Concrete
GB/T2847-1996 Volcanic Ash Blending Stock Used for Cement (neq ISO 863:1990)
GB/T5483-1996: Gypsum and Anhydrite (neq ISO 1587:1975)
GB/T8074-1987 Testing Method for Specific Surface of Cement－Blaine Method (neq ASTM C 204:1981)
GB9774-1996 Cement Packaging Bag
GB12573-1990 Cement Sampling Procedure
GB/T17671-1999 Methods of Testing Cement Mortar Strength (ISO) (idt ISO679:1989)
JC/T667-1997 Processing Admixture for Cement Mills
JC/T742-1984 (1996) Ash from Rotary Kiln Mixed with Cement
3. Definitions and Code Numbers
3.1 Portland Cement
Portland cement refers to the cement matrix mixed from Portland clinker, 0-5% limestone or granulated blast-furnace slag, right amount of gypsum. Portland cement can be divided into two types: I-class Portland cement with the code number of P.I without blending stocks, while II-class Portland cement with P.II with limestone or granulated blast-furnace slag not exceeding 5% of the cement quality.
3.2 Ordinary Portland Cement
Ordinary Portland cement with the code number of P.O refers to cement made from Portland clinker, 6%-15% blending stocks, right amount of milled gypsum.
When the active admixtures are mixed, the maximum amount shall not exceed 15%. Also, they can be substituted by kiln ashes not exceeding 5% of the cement mass or non-active admixtures not exceeding 10% of the cement mass.
When active admixtures are mixed, the maximum amount shall not exceed 10% of the cement mass.
