tailieunhanh - TC ASTM C42/C42M

Phương pháp thử tiêu chuẩn về lấy mẫu và thử nghiệm lõi khoan và đà xẻ của bê-tông | Designation C 42 C 42M 03 American Association State Highway and Transportation Officials Standard AASHTO No. T24 Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete1 This standard is issued under the fixed designation C 42 C 42M the number immediately following the desiccation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. 1. Scope This test method covers obtaining preparing and testing 1 cores drilled from concrete for length or compressive strength or splitting tensile strength determinations and 2 beams sawed from concrete for flexural sUcngth delaminations. The values stated in either inch-pound units or SI units shall be regarded separately as standard. SI units are shown in brackets. The values stated in each system may not be exact equivalents therefore each system must be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes excluding those in tables and gures shall not be considered as requirements of the standard. This standard does not purport to address the safety concerns if any 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. 2. Referenced Documents ASTM Standards C 39 C 39M Test Method for Compressive Strength of Cylindrical Concrete Specimens2 C 78 Test Method for Flexural Strength of Concrete Using Simple Beam with Third-Point Loading 2 C 174 C 174M Test Method for Measuring .