ACI 228.1R-03-In-Place Methods to Estimate Concrete Strength

ACI 228.1R-03-In-Place Methods to Estimate Concrete Strength

Guidance is provided on the use of methods to estimate the in-place strength of concrete in new and existing construction. The methods include: rebound number, penetration resistance, pullout, break-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 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.

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ACI 228.1R-03-In-Place Methods to Estimate Concrete Strength
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