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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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Home > Tools > Frequently Asked Questions
Q. Are there any tests that may be made directly on the structure to determine if the concrete has developed adequate strength without risk of overloading or causing damage to the structure? A. Yes. There are several methods to estimate the in-place strength of concrete in existing construction. The methods include rebound hammer, penetration resistance, pullout, pull-off, and ultrasonic pulse velocity (ACI 228.1R). Generally, these methods require a strength relationship, which is usually established for large projects. The most accurate method is to remove and test cores in accordance with ASTM C42. References: SP-1(02); ACI 228.1R-19; SP-168; ASTM C42 Topics in Concrete: Nondestructive Testing; Testing of Concrete
Q. Are there any tests that may be made directly on the structure to determine if the concrete has developed adequate strength without risk of overloading or causing damage to the structure?
A. Yes. There are several methods to estimate the in-place strength of concrete in existing construction. The methods include rebound hammer, penetration resistance, pullout, pull-off, and ultrasonic pulse velocity (ACI 228.1R). Generally, these methods require a strength relationship, which is usually established for large projects. The most accurate method is to remove and test cores in accordance with ASTM C42.
References: SP-1(02); ACI 228.1R-19; SP-168; ASTM C42
Topics in Concrete: Nondestructive Testing; Testing of Concrete
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