Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: AASHTO T 199:2000
• Năm ban hành / Publication date: 2000
• Tình trạng / Status: W - Hết hiệu lực
• Tên tiếng Anh / Title in English: Standard Method of Test for Air Content of Freshly Mixed Concrete by the Chace Indicator
• Thay thế cho / Replace: AASHTO T199:2000
• Số trang / Page: 2

Phạm vi áp dụng / Scope of standard

This method of test covers the determination of the air content
of freshly mixed concrete by displacing the air with alcohol and
observing the change in level of the liquid in a tube. The
apparatus is light and small, and the test procedure requires only
a few minutes.

This method has been found satisfactory for determining the
approximate air content of freshly mixed concrete. It shall not,
however, be considered suitable for replacing T 121M/T 121
(gravimetric method), T 152 (pressure method), or T 196M/T 196
(volumetric method). In no case should the value obtained through
the use of this method be accepted as determining the compliance of
the air content of concrete with the requirements of
specifications. The method is most useful for determining whether
the concrete has a low, medium, or high air content, and whether
the air content is reasonably constant from batch to batch of
concrete.