ACI 228.1R-19 PDF Download

The ACI 228.1R-19 standard is a comprehensive guide that outlines various methods for estimating the strength of concrete in both new and existing construction projects. The report discusses different techniques including rebound number, penetration resistance, pullout, pull-off, ultrasonic pulse velocity, maturity, and cast-in-place cylinders.

Each method is explored in terms of its fundamental principle, limitations, and repeatability. The report also presents procedures for establishing the necessary relationship to estimate compressive strength based on in-place test results. It emphasizes the importance of planning in-place tests and provides guidance on statistical techniques for interpreting the test data.

Additionally, the standard introduces the concept of using in-place tests for acceptance of concrete. This means that the methods discussed in the report can be employed to determine if the concrete meets the required strength specifications. The appendix of the report offers additional information on determining the number of strength levels to develop the strength relationship and explains a regression analysis procedure that takes into account errors in both dependent and independent variables.