Guide for Obtaining Cores and Interpreting Compressive Strength Results 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 testing, and the basis for determining whether the concrete in the area represented by the core strengths is structurally adequate
214. 4-21: Obtaining Cores and Interpreting Core Compressive Strength . . . 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 inspection of load-machine displacement curves or using statistical tests from ASTM E178
ACI PRC-214. 4-21: Obtaining Cores and Interpreting Core Compressive . . . 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 complies with strength-based acceptance criteria or to evaluate structural capacity of an existing structure based on in-place concrete strength In either case, the process of obtaining core
Suite of Codes - American Concrete Institute The American Concrete Institute (ACI) is a leading authority and resource worldwide for the development and distribution of consensus-based standards, technical resources, educational programs, certification programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete
506R-16: Guide to Shotcrete - American Concrete Institute The technical committees responsible for ACI committee reports and standards strive to avoid ambiguities, omissions, and errors in these documents In spite of these efforts, the users of ACI documents occasionally find information or requirements that may be subject to more than one interpretation or may be incomplete or incorrect Users who have suggestions for the improvement of ACI
Pieces of rubber stopper floating in oil (23g needle tore them off) Stuff we inject eventually ends up inside our brain and effects the very core of our existence After one inserts a needle through the stopper of a medication vial, a small piece of the stopper is sometimes sheared off (known as coring) and can be noticed floating on the liquid medication
Reported by Committee 302 - American Concrete Institute The quality of a concrete floor or slab is highly dependent on achieving a hard and durable surface that is flat, relatively free of cracks, and at the proper grade and elevation Properties of the surface are determined by the mixture proportions and the quality of the concreting and jointing operations The timing of concreting operations—especially finishing, jointing, and curing—is