Pengaruh penggunaan serutan besi dengan metode Preplaced Concrete pada kuat tekan, kuat tarik dan kuat lentur beton

HENDRA, Ir. Iman Satyarno, M.E.,Ph.D

2006 | Tesis | S2 Teknik Sipil

Bertumbuhnya industri mesin bubut di yogyakarta telah memberikan dampak yang besar pada kelancaran perekonomian masyarakat. Proses pengerjaan mesin bubut akan menghasilkan limbah (10-20) %. Dilihat dari hasil buangan limbah mesin bubut yaitu fiber yang mempunyai variasi ukuran dapat dimanfaatkan sebagai bahan pembuat beton fiber. Hasil limbah mesin bubut ini diharapkan dapat digunakan sebagai alternatif fiber pada pembuatan beton fiber sebagai mana fiber lainnya, seperti fiber baja, fiber glass dan fiber bendrat. Pada pengujian kuat tekan dan kuat tarik belah masing-masing 3 buah benda uji dengan ukuran silinder (15 cm x 30 cm) dan berat fiber 245,217 kg/m3 (Vf = 3,4 %). Pada pengujian kuat lentur dengan variasi 25 % fiber dan 75 % split, variasi 50 % fiber dan 50 % split, variasi 75 % fiber dan 25 % split dan variasi 100 % fiber, masing-masing variasi 3 buah benda uji dengan dimensi balok (10 cm x 10 cm x 50 cm). Penempatan fiber pada daerah tarik balok. Pelaksanaan pembuatan benda uji beton normal dan beton fiber menggunakan metode beton praletak/preplace concrete. Hasil uji berat jenis beton normal 2449,845 kg/m3, berat jenis beton fiber 2449,718 kg/m3, kuat tekan beton normal sebesar 39,316 MPa dan kuat tekan beton fiber sebesar 51,560 MPa pada umur 43 hari. Kuat tarik beton fiber sebesar 5,806 MPa pada umur 51 hari dan kuat tarik beton normal sebesar 3,887 MPa pada umur 42 hari. Kuat lentur beton normal sebesar 4,403 MPa pada umur 42 hari, kuat lentur beton fiber sebesar 8,869 MPa, 8,498 MPa, 9,714 MPa dan 8,449 MPa pada variasi 100 % fiber, 75 % fiber, fiber 50 % dan 25 % fiber, pada umur 51 hari.

The growth of lathe machine industry in Yogyakarta gives big contribution to improve the economic. Instrument for such a processing results in cesspool between (10 – 20)%. The cesspool lathe machine, which is like fiber, has a variety of dimension used of raw fibre concrete material. Therefore this lathe machine cesspool which can be as a component to make expected to function as alternative fibre material at fibre concrete production, like : steel fibre, glass fibre and local fibre “bendrat”. At compression strength test and split cylinder test, three samples were made for each test, a cylinder with a dimension of (150 mm x 300 mm) was reinforced with fibre at dosage of 245,217 kg/m3 (Vf = 3,4 %). At bending test, which consists of 4 variation of test, 3 sample were made for each test. The sample was in form of beam with a dimension of (100 mm x 100 mm x 500 mm) and a variation of 25 % fibre and 75 % split, a variation of 50 % fibre and 75 % split, a variation of 75 % fibre and 25 % split and a variation of 100 % fibre. The fibre was placed at tensile area. Concreting system for the sample for compression test, split cylinder test and bending test were carried out based on preplaced concrete method for plain concrete and fibre concrete construction. The result of specific gravity of plain concrete was 2449,845 kg/m3, specific gravity fibre concrete was 2449,718 kg/m3, the compression strength of plain concrete cylinders at 42 days of age was 39,316 MPa, and the compression strength of fibre concrete cylinders at 43 days of age was 51, 560 MPa. The tensile strength of plain concrete at 42 days of age was 3,887 MPa and the tensile strength of fibre concrete at 51 days of age was 5,806 MPa. The flexural strength of plain concrete at 42 days of age was 4,403 MPa and the flexural strength of fibre concrete at 51 days of age were 8,869 MPa, 8,498 MPa, 9,714 MPa dan 8,449 MPa at variation of 100 %, 75 %, 50 % and 25 % fibre.

Kata Kunci : Beton Fiber,Kuat Tekan,Kuat Tarik,Kuat Lentur, fibre, compression strength, tensile strength and flexural strength