Electronic Theses and Dissertation

Beton berserat sekarang banyak diminati karena dapat mengatasi kelemahan beton yang lemah terhadap kuat lentur beton, serat yang digunakan dapat berupa serat alami maupun sintetis. Penelitian ini terdapat penambahan serat polypropylene dan serat kaca pada proporsi campuran beton. Variasi yang digunakan adalah 0,0%, 0,2%, 0,4%, 0,6% dan 0,8%. Selain penggunaan serat, penelitian ini juga menggunakan tanah diatomae sebagai substitusi semen dengan persentase 0% dan 10% dari berat semen. Tanah diatomae yang digunakan sebelumnya telah dikalsinasi untuk meningkatkan kadar silika yang terkandung pada tanah diatomae. Tujuan penelitian ini untuk mengetahui pengaruh penambahan serat polypropylene dan serat kaca terhadap kuat lentur beton mutu tinggi. Penelitian ini dibatasi dengan faktor air semen sebesar 0,3 serta penambahan superplasticizer sebesar 1,5% dari berat semen. Benda uji yang digunakan berbentuk balok dengan ukuran 10 cm × 10 cm × 40 cm. Setiap variasi memerlukan 3 buah benda uji, sehingga total terdapat 60 benda uji. Pengujian kuat lentur beton mutu tinggi dilakukan pada saat beton berumur 28 hari. Hasil penelitian menunjukkan bahwa dengan adanya substitusi tanah diatomae nilai kuat lentur beton mutu tinggi mengalami penurunan, sedangkan dengan penambahan serat nilai kuat lentur mengalami peningkatan seiring penambahan variasi serat. Nilai kuat lentur tertinggi didapatkan pada variasi 0% tanah diatomae dan 0,8% untuk variasi serat polypropylene dengan nilai 9,26 MPa. Kuat lentur pada variasi serat kaca nilai tertingginya didapat pada 0% diatomae dan 0,8% serat yaitu 9,14 MPa.

Fiber concrete is now in great demand because it can overcome the weakness of concrete which is weak to the flexural strength of concrete, the fibers used can be in the form of natural or synthetic fibers. In this study, there was the addition of polypropylene fiber and fiberglass in the proportion of the concrete mixture. The variations used were 0.0%, 0.2%, 0.4%, 0.6% and 0.8%. In addition to the use of fiber, this study also used diatomaceous earth as a cement substitute with a percentage of 0% and 10% of the cement weight. The previously used diatomaceous earth has been calcined to increase the silica content of the diatomaceous earth. The purpose of this study was to determine the effect of adding polypropylene and glass fibers to the flexural strength of high-performance concrete. This research was limited by the water cement ratio of 0.3 and the addition of a superplasticizer of 1.5% of the cement weight. The test object used is in the form of a block with a size of 10 cm × 10 cm × 40 cm. Each variation requires 3 test objects, so a total of 60 test objects. The flexural strength test of high-performance concrete is carried out when the concrete is 28 days old. The results showed that with the substitution of diatomaceous earth, the flexural strength value of high-performance concrete decreased, while with the addition of fiber the flexural strength value increased with the addition of fiber variations. The highest flexural strength value was found in the variation of 0% diatomaceous earth and 0.8% for the variation of polypropylene fiber with a value of 9.26 MPa. The highest value of flexural strength in fiberglass variation was obtained at 0% diatomae and 0.8% fiber, namely 9.14 MPa.