Abstract. The use of coal waste (Fly Ash) is currently being developed in building materials technology, as a high-strength concrete mix material. This study aims to determine the strength of concrete by adding fly ash as a substitute for cement in high-strength concrete mixtures. This research was conducted with an experimental method to obtain results and data that would confirm the variables studied. The total number of specimens used in this study were 36 pieces with different sizes of cube tests which were 15 cm x 15 cm x 15 cm. A total of 36 concrete samples were used to test the compressive strength of concrete with a percentage of Fly Ash in 0% (normal concrete), 20%, 25% and 30% with a concrete treatment age of 7 days, 21 days and 28 days. A total of 12 more samples were used to test water absorption in concrete at 28 days of maintenance. Each percentage percentage of Fly Ash uses 3 concrete test samples. The increase in compressive strength occurs at 7, 21 and 28 days in concrete. However, the compressive strength of concrete produced by concrete using the percentage of Fly Ash is always lower than the value of normal concrete compressive strength. From testing the compressive strength of concrete at 28 days of treatment with content of 0%, 20%, 25% and 30% Fly Ash obtained results of 45.87 MPa, 42.67 MPa, 40.89 MPa, and 35.27 MPa respectively
Durian timber and Coconut timber grow a lot in the area of Gunung Pati Semarang, Central Java. The threat of biodeteoration in Indonesia as tropical area is quite high. Therefore, it is necessary to take protection measures in the form of preservation for prevention. The preservatives used in this study are natural preservative of soursop leaf extract. The preservation method used was cold soaking method with variation of concentration of preservative as follows: 0%, 5%, 10%, 15%, 20% and 25%. This study aims to figure out how significant the weight loss of timber and how durian wood and coconut wood’s resistance to termites based on the weight loss of timber. Result of examination of termite attack on Coconut timber with preservation of soursop leaf extract 0%, 5%, 10%, 15%, 20% and 25% obtained by weight loss of wood 17.57%, 13.43%, 10.61%, 7.67%, 5.50% and 4.20%. Meanwhile, the result of examination of termite attack on Durian timber with the concentration of soursop leaf extract 0%, 5%, 10%, 15%, 20% and 25% showed these following timber weight losses: 18.24%, 14.61%, 13.04%, 11.33%, 8.98% and 7.84%. Based on the wood resistance table, Durian timber with soursop leaf concentration of 20% and 25% were classified in the medium classification. Coconut timber with 15% and 20% soursop leaf concentrations were classified in the medium classification, while at 25% concentrations in resistant classification.
Perkembangan dunia konstruksi berkembang semakin pesat. Semua pihak yang terlibat dalam proyek konstruksi, baik itu kontraktor, konsultan, owner maupun pihak-pihak yang berkenpentingan dintutut supaya mampu mencari sebuah solusi untuk menyelesaikan proyek-proyek konstruksi dalam kurun waktu yang cepat. Di dalam sebuah proyek konstruksi perhitungan volume merupakan hal yang sangat penting. Apabila terjadi kesalahan dalam perhitungan volume pekerjaan maka dapat mengakibatkan kerugian yang sangat besar. Sehingga metode perhitungan volume secara konvesional yaitu dengan metode perhitungan berdasarkan pada gambar Autocad dengan dibantu Microsoft Excel yang berpedoman pada SMM (Standard Method of Measurement) yang saat ini masih dilakukan oleh beberapa pihak yang memungkinkan terjadi human error dan membutuhkan waktu yang cukup lama perlu diganti dengan metode Building Information Modeling (BIM) dengan menggunakan software Autodeks Revit yang dapat menghitung volume dan Rencana Anggaran Biaya (RAB) secara efektif dan efisien. Pada penelitian ini menggunakan cara atau metode perencanaan menggunakan Revit untuk mendesain bagian struktur (tanpa tangga) bangunan berupa pembetonan pondasi bore pile, pile cap, tie beam, kolom dan balok serta plat. Kemudian akan diperoleh volume dan Rencana Anggaran Biaya (RAB). Berdasarkan hasil penelitian yang telah dilakukan diperoleh hasil perhitungan dari Revit berupa volume total pembetonan sebesar 1647,99 m3 dan Rencana Anggaran Biaya (RAB) sebesar Rp 1.604.376.387,67
Concrete is the one of the building construction materials that has a high compressive strength, but it has lower tensile strength. The addition of fibers to concrete is expected to improve its mechanical properties. In this study, the concrete was added with Polypropylene (PP) fiber with a length of 12 mm. The compressive strength of concrete specimens was 20 MPa with the variety of fiber used was 0.5 kg/m3; 1 kg/m3; and 1.5 kg/m3. The test were conducted on 36 specimens in the form of cylinders and cubes. The tests were compressive strength, split tensile strength and water absorption at the age of 28 days. The highest value of the compressive strength of the fiber concrete was the amount of Polypropylene fiber 1 kg/m3, namely 2.92 MPa, increase of 6.92% of the compressive strength of concrete without additional fiber. The highest value for the split tensile strength in the amount of Polypropylene fiber 1 kg/m3 was 2.34 MPa or an increase of 21% from the tensile strength value of concrete without additional fiber. Meanwhile, the lowest water absorption capacity of concrete is the addition of 1.5 kg/m3 of fiber, which is 2.366% or has decreased by 64% from the concrete without fiber.
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