Modifikasi Reformulasi Grafik Kuat Tekan Beton  dengan  Hammer Test Tipe-N untuk Meningkatkan  Akurasi Hasil Uji Kubus dan Silinder

I Gusti Ngurah Eka Partama

doi:10.31815/jp.2025.20.1-10

Authors

I Gusti Ngurah Eka Partama Civil Engineering Study Program, Faculty of Science and Technology, Ngurah Rai University

DOI:

https://doi.org/10.31815/jp.2025.20.1-10

Keywords:

Concrete, N-Type hammer test, compressive strength, hammer rebound number, non-destructive test, polynomial regression of degree 2

Abstract

One of the non-destructive test concrete strength tests is using N-Type Original Hammer Test which really depends on accuracy when drawing lines, determining points and reading compressive strength values on curves and axes on the prepared graph. This weakness will be overcome by compiling a mathematical equation that states the relationship between reflective value (Rn) and compressive strength (f'c). This research aims to modify the graph and determine a formulation that expresses the Rn-f'c correlation. The study was carried out using regression analysis based on the Rn-f'c correlation on the graphs available on the tool body and in the manual and re-simulating using Rn = 2 to 60. The simulation data was re-analyzed to determine corrections to the regression equation and modifications to the original graph. This research concludes that in testing using the N-Type Original Hammer test the compressive strength can be determined using the 2nd degree polynomial regression equation, namely: The equivalent compressive strength of a cube specimen in horizontal, downward and upward directions respectively using the formulation f'c_cu = 0.0113Rn²+ 0.8569Rn-12.615; f'c_cu = 0.011Rn²+0.8845Rn-8.1916; f'c_cu = 0.0156Rn²+0.5544Rn-14.081, while for cylindrical specimens respectively f'c_ci = 0.0077Rn²+ 0.8557Rn-7.9264; f'c_ci = 0.0074Rn²+0.8875Rn-12.663; f'c_ci = 0.0083Rn²+0.877Rn-19.679, with f’c in MPa and Rn = hammer rebound number.

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