Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ASTM D4525-90(2001)
• Năm ban hành / Publication date: 1990
• Tình trạng / Status: W - Hết hiệu lực
• Tên tiếng Anh / Title in English: Standard Test Method for Permeability of Rocks by Flowing Air
• Chỉ số phân loại Quốc tế (ICS) / By field: 93.020 - Công việc làm đất. Bào đất. Xây dựng móng. Công trình ngầm
• Số trang / Page: 4
• Phạm vi áp dụng / Scope of standard: 1.1 This test method covers the determination of the coefficient of specific permeability for the flow of air through rocks. The procedure is to establish representative values of the coefficient of permeability of rocks or well-indurated soils. 1.2 This test method is limited to permeability values greater than 0.9869 nm (1.0 microdarcy), and is limited to rocks free of oil or unctuous matter. 1.3 The values stated in SI units are to be regarded as the standard. 1.4 This standard does not purport to address the safety problems 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.