Trend penggunaan semen untuk konstruksi dalam beberapa tahun belakangan ini telah beralih dari tipe Ordinary Portland Cement (OPC) menjadi Portland Composite Cement (PCC). Hal ini berdasarkan kebijakan industri semen untuk mengkonversi sebagian kandungan semen OPC menggunakan material pozzolanik. Oleh karena itu semen tipe PCC lebih mudah diperoleh di pasaran dan telah banyak digunakan sektor konstruksi dalam aplikasi di berbagai lingkungan meski belum banyak diteliti keunggulannya. Pada penelitian ini dikaji karakteristik beton semen PCC untuk aplikasi dermaga di daerah pasang-surut lingkungan air laut. Parameter penelitian adalah penambahan aditif silika dan umur beton yang direndam di air laut. Beton PCC dengan mutu beton fc’ = 30 MPa digunakan sebagai campuran kontrol, sedangkan beton PCC dengan tambahan silica fume (PCC+SF) sebesar Setelah benda uji dicetak, kemudian benda uji direndam di bak perendaman selama 3 hari dan diletakkan di daerah pasang-surut pelabuhan Belawan, Medan, Sumatera Utara hingga waktu pengujian. Pengujian yang dilakukan adalah kuat tekan, kuat tarik dan porositas setelah benda uji direndam dalam air laut pada umur 28, 91 dan 180 hari. Hasil pengujian menunjukkan bahwa umumnya kuat tekan dan kuat tarik meningkat serta porositas menurun untuk beton PCC dan PCC+SF meski direndam di daerah pasang-surut hingga umur 180 hari. Akan tetapi beton PCC+SF memiliki karakteristik lebih baik dibandingkan beton PCC dan direkomendasikan untuk beton terpapar air laut di daerah pasang-surut.
There have been many experiments regarding reusing plastic bottles, especially polyethylene (PET) as building materials. Some of them are experimenting with their compressive strength as exterior wall bricks (Mansour, et al., 2015); their energy consumption as roof insulations (Racolta, et al., 2016); their compressive and flexural strength as interior walls (Santana, 2016); and their compressive strength as walls and slabs (Oyinlola, et al., 2018). This paper discusses the compressive strength and the flexural strength of PET bottles as structural floor panels. This study explored the positions, binders, patterns, fillers, sizes, and supports of the PET bottles panel to reach the optimum combination of compressive and flexural strength. The experimental result shows that PET bottles panel with an upright position, sealant binder, and sand filler has better compressive strength and flexural strength. It also shows that the panels with more bottles face downwards have better compressive strength, while the ones with more bottles face upwards have better flexural strength. On the other hand, panel with smaller size and higher amount of support shows better flexural strength.
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