Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: AASHTO HM-31 PT II:2011
• Năm ban hành / Publication date: 2011
• Tình trạng / Status: W - Hết hiệu lực
• Tên tiếng Anh / Title in English: Standard Specifications for Transportation Materials and Methods of Sampling and Testing Part 2A: Tests
• Thay thế cho / Replace: AASHTO HM-30 PT IIA:2010
• Số trang / Page: 1

Phạm vi áp dụng / Scope of standard

This test method covers determination of the amount of material
finer than a 75-μm (No. 200) sieve in aggregate by washing. Clay
particles and other aggregate particles that are dispersed by the
wash water, as well as water-soluble materials, will be removed
from the aggregate during the test.

Two procedures are included, one using only water for the
washing operation, and the other including a wetting agent to
assist the loosening of the material finer than the 75-μm (No. 200)
sieve from the coarser material. Unless otherwise specified,
Procedure A (water only) shall be used.

The values stated in SI units are to be regarded as 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 standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.