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Title: A Screening Method for Very-Low-Strength Concrete

Author(s): Maisha Maliha, Tomoya Nishiwaki, AFMS Amin

Publication: Materials Journal

Volume: 119

Issue: 6

Appears on pages(s):

Keywords: nondestructive test (NDT), rebound hammer (RH), scratching test (ST), low-strength concrete (LSC), brick aggregates, rebound quotient (Q), groove width (GW)

Date: 8/28/2022

Abstract:
A screening method is developed by predicting the strength of very-low-strength (<9 MPa) concrete by the use of the rebound quotient and groove width from two low-energy direction-independent nondestructive test methods (NDTs), i.e., a type-L rebound hammer and a scratching test, respectively, for brick and stone aggregate concrete. It is statistically demonstrated that low-strength concrete (LSC) exhibits a smaller standard deviation because of its low strength of the mortar phase, which ensures reliable LSC screening with any of the above methods. However, for higher-strength (>9 MPa) concrete classes, due to the increase in standard deviation, the simultaneous use of the two methods is proposed with a conservative approach to estimate the in situ concrete strength during “rapid visual screening” of buildings. Normal distribution curves classify the concrete compressive strength considering NDT boundary values with information on occurrence probability. Field test results are verified with laboratory-based correlations within acceptable statistical significance.


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