Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: AASHTO T 21M/T 21:2015
• Năm ban hành / Publication date: 2015
• Tình trạng / Status: W - Hết hiệu lực
• Tên tiếng việt / Title in Vietnamese: Standard Method of Test for Organic Impurities in Fine Aggregates for Concrete
• Tên tiếng anh / Title in English: Standard Method of Test for Organic Impurities in Fine Aggregates for Concrete

Thay thế cho / Replace

AASHTO T 21:2005

Thay thế bằng / Replaced by

AASHTO T 21M/T 21:2016

Lịch sử soát xét / History of version

• AASHTO T 21:2005(W - Hết hiệu lực)
• AASHTO T 21M/T 21:2015 
• AASHTO T 21M/T 21:2016(W - Hết hiệu lực)
• AASHTO T 21M/T 21:2020(A - Còn Hiệu lực)

• Số trang / Page: 5

Phạm vi áp dụng / Scope of standard

This test method covers two procedures for an approximate determination of the presence of injurious organic compounds in fine aggregates that are to be used in hydraulic cement mortar or concrete. One procedure uses a glass color standard and the other uses a standard color solution.

The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.

This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety concerns associated with its use. It is the responsibility of the user of this procedure to consult and establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to its use.