AASHTO TP 137-20 PDF Download

AASHTO TP 137-20 is a standard method of testing the box test in slip form paving of fresh Portland cement concrete. The purpose of this standard is to measure and evaluate the workability of hydraulic-cement concrete in slip-formed paving applications. This testing method can be used in both laboratory and field settings to assess the consistency and flowability of the concrete mix. The box test involves placing a sample of the concrete mixture into a box and determining the time it takes for the mix to flow a specified distance. The results of the test can help ensure that the concrete mix is suitable for slip-form paving, which requires a certain level of workability for proper placement and consolidation. This standard provides detailed instructions on the apparatus, specimen preparation, and test procedure to ensure consistent and accurate results.