S. K. Katariya, Abhishek Prasad, Pankaj Prasad | International Journal of Structural Engineering and Analysis | Vol 12, Issue 02 | ISSN: 2456-5326
Abstract
Abstract
The assessment of in-situ concrete strength using non-destructive testing (NDT) techniques has
become increasingly important for quality assurance, structural evaluation, and condition
assessment of concrete infrastructure. Among the available NDT methods, the digital rebound
hammer offers a rapid, economical, and non-destructive means of estimating concrete
compressive strength. This study experimentally investigates the correlation between rebound
numbers obtained from a digital rebound hammer and the compressive strength of M30 grade
concrete determined using a Compression Testing Machine (CTM).A total of 48 concrete mix
combinations were designed in accordance with IS:10262 and cast as 150 mm × 150 mm × 150
mm cube specimens. After 28 days of water curing, each specimen was tested using a LANGRY
RH225-B digital rebound hammer, with six rebound readings recorded on each cube to obtain an
average rebound number. Subsequently, the specimens were subjected to destructive
compressive strength testing using a calibrated CTM.The experimental results demonstrated a
strong positive correlation between the average rebound number and the measured compressive
strength. The proposed correlation indicates that the digital rebound hammer can reliably
estimate the compressive strength and quality of M30 concrete with satisfactory accuracy. The
developed relationship provides a practical framework for rapid on-site evaluation of concrete
where destructive testing is impractical or undesirable. The findings confirm the applicability of
digital rebound hammer testing as an effective quality assessment tool for cement concrete
pavements and other reinforced concrete structures, facilitating efficient structural inspection and
maintenance.
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