ASTM RR:C09-1022 PDF Download

The ASTM RR:C09-1022 standard outlines a procedure for measuring the slump of hydraulic-cement concrete. Slump refers to the consistency or workability of concrete, which is important in determining its suitability for various construction applications.

The standard involves conducting a laboratory test using a mold in the shape of a truncated cone. The mold is filled with freshly mixed concrete and then lifted vertically, allowing the concrete to settle and spread out. The difference between the height of the mold and the height of the settled concrete is measured and recorded as the slump.

To ensure consistent and reliable results, the standard recommends specific requirements for the apparatus and materials used in the test. It also provides guidelines for the preparation and handling of the concrete sample before testing. Additionally, the standard addresses the proper technique for conducting the test, including the procedure for lifting and removing the mold and measuring the slump.

The ASTM RR:C09-1022 standard concludes with details on the precision of the test method. An interlaboratory study was conducted by fifteen volunteer technicians to determine the reliability and repeatability of the test results. This precision statement is crucial for ensuring consistent and accurate measurements of concrete slump across different testing facilities.