FIDI, FIDI (2021) PENGARUH GRADASI AGREGAT TERHADAP ENERGI FRAKTUR BETON DENGAN MENGGUNAKAN METODE WORK OF FRACTURE. S2 thesis, Universitas Mercu Buana Jakarta.
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Abstract
The Concrete whose composition mostly affects the strength of concrete is aggregate. About 60-70% of the weight and volume of the concrete material consists of aggregates. Thus, the characteristics of the aggregate from its geometry, density, maximum size to gradation greatly affect the ability of the concrete. Aggregate which acts as a concrete filler acts as an energy release medium known as fracture energy. The experiments in this study used different coarse aggregate gradations with a maximum diameter of 25 mm and 20 mm. experiments include compressive strength test and fracture parameter test. This experiment using the Three-point bend test based on RILEM with samples that have a notch ratio of 0.25 from the sample height and a loading rate configuration of 0.05 cm/ sec with a close-loop test machine that produces load-displacement curves to calculate fracture parameters. Concrete samples using cement water ratio of 0.3 with a uniform gradation variation of 25mm, uniform 20 mm and continuous 25 mm tested at 56 days concrete age. The results obtained show that aggregate gradation influences compressive strength, fracture energy and reduction of stress intensity factor. The highest fracture energy is obtained in continuous gradation compared to uniform gradation while the greatest compressive strength is obtained in uniform gradation with a maximum aggregate diameter of 20 mm. The highest stress intensity reduction value is obtained in a continuous gradation sample with a diameter of 25 mm. Keywords: compressive strength; modulus elasticity; fracture energy; work of fracture; wedge forces Material yang komposisinya paling berpengaruh terhadap kekuatan beton adalah agregat. Sekitar 60-70% dari berat dan volume material beton terdiri dari agregat. Dengan demikian, karakteristik agregat mulai dari geometri, massa jenis, ukuran maksimum hingga gradasinya sangat mempengaruhi kemampuan beton. Agregat yang berfungsi sebagai pengisi beton bertindak sebagai media pelepas energi yang dikenal sebagai fracture energy. Percobaan pada penelitian ini menggunakan gradasi agregat kasar yang berbeda dengan diameter maksimum 25 mm dan 20 mm. percobaan meliputi uji kuat tekan dan uji fraktur. Percobaan ini menggunakan uji three point bend berbasis RILEM dengan sampel yang memiliki rasio takik 0,25 dari tinggi sampel dan konfigurasi laju pembebanan 0,05 cm/detik dengan mesin uji close-loop yang menghasilkan kurva beban-perpindahan untuk menghitung parameter fraktur. Sampel beton menggunakan rasio air semen 0,3 dengan variasi gradasi seragam 25mm, seragam 20 mm dan menerus 25 mm diuji pada umur beton 56 hari. Hasil yang diperoleh menunjukkan bahwa gradasi agregat berpengaruh terhadap kuat tekan, energi fraktur dan pengurangan faktor intensitas tegangan. Energi fraktur tertinggi diperoleh pada gradasi menerus dibandingkan gradasi seragam sedangkan kuat tekan terbesar diperoleh pada gradasi seragam dengan diameter agregat maksimum 20 mm. Nilai pengurangan intensitas tegangan tertinggi diperoleh pada sampel gradasi kontinu dengan diameter 25 mm. Keywords: kuat tekan; modulus elastisitas; energi fraktur; work of fracture; wedge forces
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