These criteria specify the circumstances when core tests are permitted, the number of cores to be tested, the conditioning of the cores before testing, the limits on the time interval between coring and …

Chapter 5 summarizes coring tech-niques that should result in high-quality, undamaged, repre-sentative test specimens. Chapter 6 describes procedures for testing cores and detecting outliers by …

Low Strength Results and Core Testing Q. Lower-than-specified compressive strength was determined from results of cylinder testing of one concrete placement on our project. How can we determine if …

Expect Compressive Strength Test Results Less Than Specified Strength on Every Project!

Low-strength cylinder test results Q. If a structure is being built in accordance with the requirements of ACI 318-19, what must be done when a low-strength test occurs? A. Section 26.12.6.1 of ACI 318-19 …

A. According to ACI PRC-214.4R-21, “Obtaining Cores and Interpreting Core Compressive Strength Results” the in-place strength of the concrete at the

This guide is a companion document to ACI 506.2, “Specification for Shotcrete,” and provides information on materials and properties of both dry-mix and wet-mix

American Concrete Institute

Nov 30, 2025 · The American Concrete Institute (ACI) is a leading authority and resource worldwide for the development and distribution of consensus-based standards, technical resources, educational …

Description Core testing is the most direct method to determine the compressive strength of concrete in a structure. Generally, cores may be obtained to assess whether concrete in a new structure …