GB/T 2015-2017White Portland cement (English PDF)

1 Scope

This Standard specifies the terms, definitions, components, materials, grading, code, technical requirements, test methods, inspection rules, packaging, mark, transportation and storage of white Portland cement.

This Standard is applicable to the production and application of white Portland cement.

2 Normative References

The following documents are indispensable to the application of this Standard. In terms of references with a specified date, only versions with a specified date are applicable to this Standard. The latest version (including all the modifications) of references without a specified date is also applicable to this Standard.

GB/T 176 Method for Chemical Analysis of Cement

GB/T 1345 The Test Sieving Method for Fineness of Cement

GB/T 1346 Test Methods for Water Requirement of Normal Consistency, Setting Time and Soundness of the Portland Cement

GB/T 5483-2008 Natural Gypsum

GB/T 5950-2008 Method for Measurement of Whiteness of Building Materials and Non-metal Mineral Products

GB/T 6566 Limit for Radionuclides in Building Materials

GB/T 9774 Sacks for Packing Cement

GB/T 12573 Sampling Method for Cement

GB/T 17671 Method of Testing Cements - Determination of Strength

GB/T 17749-2008 Methods of Whiteness Specification

GB/T 21371 By-product Gypsum Used in Cement

GB/T 26748 Cement Grinding Aids

GB 31893 Limit and Determination of the Water-soluble Chromium (VI) Content for Cement

5 Grading and Code

5.1 White Portland cement shall be divided into Grade-32.5, Grade-42.5 and Grade-52.5 in accordance with the strength.

5.2 White Portland cement shall be divided into Grade-1 and Grade-2 in accordance with the whiteness; its code shall be P·W-1 and P·W-2 respectively.

6 Technical Requirements

7 Test Methods

8 Inspection Rules

inspection result of the sampling of material object; or the test report of the same serial number of cement released by cement factory. The buyer and the seller shall negotiate and determine which method of acceptance check shall be adopted; this content shall be indicated in the contract or agreement.

8.6.2 When the inspection result of the sampling of material object is taken as the basis, the buyer and the seller shall also take a sample and seal the package before delivery or on the site of delivery. The sampling method shall comply with GB/T 12573; the sampling size is 24 kg, which shall be divided into two equal parts. One part shall be preserved by the seller for 40 days; the other part shall be inspected by the buyer in accordance with the items and methods stipulated in this Standard.

Within 40 days, when the buyer believes that the product quality cannot comply with the requirements in this Standard after inspection and the seller believes it is controversial, both parties shall submit the other sample preserved by the seller to a provincial-level or above cement quality supervision and inspection institution that is nationally acknowledged for arbitration and inspection.

8.6.3 When the test report of the same serial number of cement released by cement factory is taken as the basis of acceptance check, the buyer shall take a sample from the same serial number of cement before shipment or during delivery. After both parties seal the package, it shall be preserved by the seller for 90 days, or acknowledge the preserved sample independently taken, sealed and preserved for 90 days by the seller.

Within 90 days, when the buyer has doubts about the cement quality, both parties shall submit the jointly sealed sample to a provincial-level or above cement quality supervision and inspection institution that is nationally acknowledged for arbitration and inspection.

9 Packaging, Mark, Transportation and Storage