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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational 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.
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This report provides methods for estimating the in-place strength of concrete in new and existing construction. These methods include: rebound number, penetration resistance, pullout, pull-off, ultrasonic pulse velocity, maturity, and cast-in-place cylinders. The principle, inherent limitations, and repeatability of each method are reviewed. Procedures are presented for developing the relationship needed to estimate compressive strength from in-place results. Factors to consider in planning in-place tests are discussed, and statistical techniques to interpret test results are presented. The use of in-place tests for acceptance of concrete is introduced. The Appendix A provides information on the number of strength levels that should be used to develop the strength relationship and explains a regression analysis procedure that accounts for error in both dependent and independent variables.
The Collection Online includes all new committee standards and reports released throughout the year. The most recently added include:
439.5R-18 Guide for the Specification, Manufacture, and Construction Use of Welded Wire Reinforcement
439.6R-19 Guide for the Use of ASTM A1035/A1035M Type CS Grade 100 (690) Steel Bars for Structural Concrete
548.6R-19 Polymer Concrete - Guidelines for Structural Applications
228.1R-19 Report on Methods for Estimating In-Place Concrete Strength
130R-19 Report on the Role of Materials in Sustainable Concrete Construction
239R-18 Ultra-High-Performance Concrete: An Emerging Technology Report
ITG-10.1R-18 Report on Alternative Cements
563-18 Specifications for Repair of Concrete in Buildings
311.6-18 Specification for Testing Ready Mixed Concrete
550.4-18 Qualification of Precast Concrete Diaphragm Connections and Reinforcement at Joints for Earthquake Loading and Commentary