Korelasi antara hasil pengujian hammer dan UPV dengan hasil pengujian kuat tekan beton Fly-Ash mutu sedang

Abstract

The use of fly ash waste from power plants can be utilized as a substitute material in concrete production for construction purposes such as buildings. A building requires structural evaluation to identify potential damages or weaknesses. There are two commonly used methods for structural evaluation: destructive and non-destructive testing. In some conditions, carrying out destructive tests in the field is not feasible, hence non-destructive testing is employed. Common non-destructive tests include the hammer test and UPV test, yet the results obtained from these tests have not fully depicted the overall strength of the structure. Therefore, it is necessary to establish correlations with several other compressive strength tests. The purpose of this study is to determine the correlation between the results of concrete compressive strength tests conducted in the laboratory using a compression test apparatus, hammer test, and UPV test. The tests were carried out on cylindrical test specimens with a diameter of 15 cm and a height of 30 cm, with variations in concrete quality including 14,5 MPa, 21 MPa, 25 MPa, and 30 MPa, with a 10% substitution of fly ash for cement. The correlations/relationships among the three tests obtained in this study are as follows: UPV test with compression test is represented by Y = 145.88ln(x) - 1201.9 (R² = 0.4691), hammer test with compression test is represented by Y = 1.8592x - 24.34 (R² = 0.5802), and the combination of hammer test and UPV test with compression test is represented by Y = -62.102 + 0.011x1 + 1.420x2 (R² = 0.602).