AASHTO R 100-21 PDF Download

The AASHTO R 100-21 standard provides guidelines for the preparation and curing of concrete test specimens in construction projects. This standard specifically focuses on the production of cylinder and beam specimens.

According to the standard, the concrete used to create the test specimens should be sampled after all on-site adjustments have been made to the mixture proportions, including the addition of mix water and admixtures. This ensures that the specimens accurately represent the concrete used in the construction project.

It is important to note that this practice is primarily suitable for making specimens from concrete that has a measurable slump and does not require other sizes or shapes of specimens. If the concrete does not meet these criteria, alternative procedures may be required.

The standard acknowledges the existence of two different measurement systems, SI units and inch-pound units. It states that the values provided in each system should be considered separately as standards, as they may not be exact equivalents. It emphasizes that combining values from both systems may result in nonconformance with the standard.