Getah tayar sampah sentiasa menjadi kebimbangan utama di dunia dan telah membawa banyak masalah kepada alam sekitar. Para penyelidik telah mendapatkan bahawa bahan getah dikitar semula sebagai pengganti sebahagian daripada agregat di dalam campuran konkrit dan persembahan mekanikal konkrit dinilai menggunakan kaedah yang disyorkan sebelumnya. Penggabungan getah tayar sampah akan mengurangkan jumlah tayar buangan ke dalam tapak pelupusan sampah dan juga untuk menyelesaikan masalah pengurangan bahan mentah. Kesan gabungan antara getah dan gentian keluli pada struktur lajur struktur telah didapati dalam kajian ini. Saiz getah kasar dari 1.15 hingga 2.36mm dan gentian keluli mikro licin diameter 0.2 mm dan panjang 10 mm telah digunakan sebagai bahan dalam campuran konkrit. 15% daripda bahagian agregat halus telah digantikan dengan getah gentian keluli sebanyak 0.5% daripada seluruh berat konrit telah ditambah ke dalam campuran. Empat campuran konkrit telah disediakan dalam kajian ini seperti konkrit biasa biasa (OPC), konkrit mengandungi gentian keluli (SFRC), konkrit getah (RC) dan konkrit getah mengandungi (RSFRC). Sifat mekanikal setiap campuran konkrit jenis (kekuatan mampatan, kekuatan tegangan dan kekuatan lenturan) telah dinilai menggunakan kaedah masing-masing. Keputusan yang diperoleh menunjukkan kelemahan sifat mekanikal apabila menggantikan agregat halus dengan bahan getah dalam konkrit manakala penambahan gentian keluli meningkatkan sifat mekanikal konkrit. Untuk kerja eksperimen lajur, kapasiti penyerapan tenaga lajur telah diperolehi dengan mengirakan kawasan di bawah graf lengkung-lompongan untuk setiap lajur. Keputusan menunjukkan bahawa interaksi antara getah dan gentian keluli boleh meningkatkan kapasiti penyerapan tenaga dan kemuluran konkrit.
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Waste tire rubber is always a major concern in the world and has created many problems to the environment. Researchers have found out recycled rubber materials as partial replacement of the aggregates inside the concrete mix and concrete mechanical performances are assessed using methods recommended previously. Incorporation of waste tire rubber will reduce the amount of waste tires into the landfill and also to cater the issue on the depletion of raw materials. The effect of combination between crumb rubber and steel fiber on the structural behavior of column was identified in this study. Crumb rubber of size ranging from 1.15 to 2.36mm and smooth micro steel fibres of diameter 0.2 mm and length 10 mm were used in the concrete mix. The rubber was partially replacing the fine aggregates at percentage of 15% and steel fiber with volume fraction of 0.5% was added into the mix. Four concrete mixes were prepared in this study such as normal plain concrete (OPC), steel fiber reinforced concrete (SFRC), rubberized concrete (RC) and rubberized steel fiber reinforced concrete (RSFRC). Mechanical properties of each type concrete mix (compressive strength, tensile strength and flexural strength) were assessed using respective methods. Results obtained showed reduction of mechanical properties when replacing rubber materials into concrete whereas addition of steel fiber enhanced the mechanical performance of concrete. For the column experimental work, energy absorption capacity of column was obtained by calculating area under load-deflection curve of each column. It was found that interaction between crumb rubber and steel fiber will enhance energy absorption capacity and ductility of concrete.
Structural behaviour of rubberized concrete column with steel fiber subjected to axial loading / Tan Chia Shin