Kajian Mutu Kuat Tekan Beton (fc’) Dengan Variasi Ukuran Diameter Coring Pada Perkerasan Jalan Beton

Zulfan, Rahmad (2022) Kajian Mutu Kuat Tekan Beton (fc’) Dengan Variasi Ukuran Diameter Coring Pada Perkerasan Jalan Beton. Masters thesis, Universitas Islam Riau.

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Abstract

Core drill testing is a method that directly determines the actual strength of concrete in a structure. Generally, cores are obtained to evaluate and assess whether the strength of a concrete structure is in accordance with the planned quality. Although the core looks very representative of the strength of a structure than a cylindrical test object that is printed separately, according to ACI 214.4R-03 there are several correction factors that must be considered when using the core testing method, one of which is the diameter of the core. This study aims to determine the value of the concrete compressive strength of core drill specimens with various diameter sizes, namely 6 inches, 4 inches and 3 inches and laboratory cylinder specimens, in addition to knowing the comparison of the compressive strength of concrete from specimens taken with core drill tools with various diameter sizes above are then compared with the compressive strength value of the laboratory cylinder test object. To determine the value of the concrete compressive strength of the core drill cylinder specimen against the laboratory cylinder specimen, experimental research was carried out by making 4 laboratory cylinder specimens and field sample (before spread) each for each variation in the size of the sample, and taking samples of the object. core drill test (on a 28 day old concrete plate) as many as 4 pieces for each variation in the size of the sample then each sample is tested for compressive strength in the laboratory From the results of this study, it was found that the highest average concrete compressive strength for laboratory samples was a sample with a diameter of 6 inches with a value of 40.45 MPa, while for field samples it was a sample with a diameter of 4 inches with a value of 35.85 MPa, and for a sample ofcore drillis a sample with a diameter of 3 inches with a value of 26.25 MPa. The results of this study indicate a tendency that the value of the compressive strength of concrete is not only influenced by the size of the sample diameter but is also influenced by the bonding process between the coarse aggregate and the mortar. The bond area between coarse aggregate and mortar or cement paste is the weakest link in concrete. This can be seen from the pattern of sample collapse after the compression test, where the laboratory samples and filed samples experienced shear failure and longitudinal failure (columnar), while the core drill sample only experienced a longitudinal failure pattern (columnar).

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