Revised Rebound Hammer and Pull‐Out Test Strength Curves for Fiber‐Reinforced Concrete

Abstract

Rebound hammer tests and postinstalled pull-out tests are commonly used for evaluating the compressive strength of ordinary concrete, and the strength of concrete is estimated by strength curves. However, using these strength curves to predict the compressive strength of carbon fiber-reinforced concrete (CFRC), polypropylene fiber-reinforced concrete (PFRC), and carbonpolypropylene hybrid fiber-reinforced concrete (HFRC) may lead to considerable uncertainties. erefore, this study revises the strength curves derived from rebound hammer tests and postinstalled pull-out tests for ordinary concrete. 480 specimens of fiberreinforced concrete (FRC) of six strength grades are examined. Standard cube compressive strength tests are used as a reference, and the results of various regression models are compared. e linear model is determined as the most accurate model for postinstalled pull-out tests, whereas the power model is the most accurate for rebound hammer tests. e proposed strength curves have important applications for FRC engineering of the postinstalled pull-out tests and rebound hammer tests.

Physical, Mechanical and Durability Properties of Ecofriendly Ternary Concrete Made with Sugar Cane Bagasse Ash and Silica Fume

“…To determine the rebound number of specimens of the six concrete mixtures this study, tests were carried out according to the NMX-C-192-ONNCCE-2018 s [54], in which a procedure is established to determine the rebound index for h concrete using a device known as a sclerometer or rebound hammer, to evaluate t pressive strength as well as the surface uniformity of the concrete. The results are ered relative rather than absolute values, but the test has the advantages of be destructive and widely used worldwide, and is used for evaluating the com strength of in-situ concrete [55] and in conjunction with the UPV test to predict t pressive strength of concrete in studies according to the findings of Amine et al rebound hammer, abrasive stone, spatula, flannel and brush were used to carry test. The test surface preparation was at least 150 mm in diameter and 100 mm th surface was free of any layer other than concrete (see Figure 3).…”

Comparison of Nondestructive Testing Method for Strength Prediction of Asphalt Concrete Material

“…The basic principles of the hammer assume that the strength development of concrete strength associated with the increasing surface hardness of concrete. After 40 years of creating the hammer and testing it on a large scale globally, around 50,000 Schmidt hammers have been sold worldwide [18,[30][31][32][33][34]. Figure 1 presents schematic and photo of rebound hammer.…”