Kualitas Beton SCC dengan Bahan Tambah Superplasticizer dan Limbah Serat Kenaf (Hibiscus Cannabinus L.)

Abstract

INTISARI Self Compacting Concrete (SCC) adalah inovasi beton berupa beton cair memadat mandiri tanpa adanya bantuan alat penggetar berupa vibrator. Karakteristiknya yang cair memudahkan pada proses pengadukan. Dalam penelitian ini dilakukan pengujian kuat tekan, kuat tarik belah, dan kuat lentur beton SCC. Bahan yang ditambahkan ke dalam adukan adalah limbah serat kenaf dengan persentase 0%, 0,25%, 0,5%, 0,75%, dan 1% serta superplasticizer consol N11 LN dengan persentase 1,25%. Masing-masing pengujian dibuat 4 sampel benda uji dengan pengujian pada umur 28 hari. Dari hasil pengujian kuat tekan beton SCC mengalami penurunan kuat tekan seiring dengan ditambahkannya variasi limbah serat kenaf. Pada pengujian kuat tarik belah dan kuat lentur beton SCC mengalami kenaikan seiring ditambahkannya variasi limbah serat kenaf. Pada penambahan LSK 1 tidak memenuhi syarat sebagai beton SCC dikarenakan diperoleh nilai slump flow 52,71 cm. Limbah serat kenaf pada kuat tekan beton SCC maksimum yaitu pada LSK 0,25 mencapai 27,61 MPa akan tetapi beton tanpa serat tetap yang mencapai kuat tekan tertinggi sebesar 28,69 MPa, sedangkan penggunaan limbah serat kenaf pada kuat tarik belah beton SCC maksimum yaitu pada LSK 0,75 mencapai 2,77 MPa, sedangkan penggunaan limbah serat kenaf pada kuat lentur beton SCC maksimum yaitu pada LSK 0,75 mencapai 4,29 MPa. Kata Kunci: Self Compacting Concrete Limbah serat kenaf Kuat tekan Kuat tarik belah Kuat lentur ABSTRACT Self Compacting Concrete (SCC) is a concrete innovation in the form of liquid concrete that compacts independently without the help of a vibrator. Its liquid characteristics make the mixing process easier. In this research, compressive strength, split tensile strength and flexural strength of SCC concrete were tested. The ingredients added to the mixture are kenaf fiber waste with percentages of 0%, 0.25%, 0.5%, 0.75% and 1% as well as consol N11 LN superplasticizer with a percentage of 1.25%. For each test, 4 samples of test objects were made with testing at the age of 28 days. From the test results, the compressive strength of SCC concrete experienced a decrease in compressive strength along with the addition of variations in kenaf fiber waste. In testing the split tensile strength and flexural strength of SCC concrete increased as variations in kenaf fiber waste were added. The addition of LSK 1 does not meet the requirements as SCC concrete because the slump flow value is 52.71 cm. Waste kenaf fiber has the maximum compressive strength of SCC concrete, namely at LSK 0.25, reaching 27.61 MPa, but concrete without fixed fiber reaches the highest compressive strength of 28.69 MPa, while the use of waste kenaf fiber for maximum split tensile strength of SCC concrete is at LSK 0.75 it reaches 2.77 MPa, while the use of kenaf fiber waste on the maximum flexural strength of SCC concrete is at LSK 0.75 it reaches 4.29 Mpa. Keyword: Self Compacting Concrete Kenaf fiber waste Compressive strength Split tensile strength Flexural strength