Turapan asfalt yang dikitar semula (RAP) boleh dirujuk sebagai bahan buangan yang ditebus dan diproses semula untuk memperoleh asfalt dan agregat. Kebanyakan penggunaan RAP akan dikitar semula ke dalam turapan dan oleh itu, kesesuaian agregat kitar semula dari turapan asfalt untuk digunakan dalam aplikasi lain seperti konkrit simen Portland masih belum dikenalpasti. Dalam kajian ini, kesan penggantian separa agregat kasar oleh agregat kitar semula dari turapan asfalt terhadap sifat-sifat konkrit telah dikaji. Agregat kitar semula yang digunakan berasal dari turapan asfalt atau agregat turapan asfalt dikitar semula (RAP). Agregat kasar RAP diperolehi dari JKR Pulau Pinang dan kemudiannya dihancurkan menjadi gumpalan agregat yang lebih kecil. Gumpalan agregat ini kemudiannya disaring dan digredkan kepada saiz yang sama seperti agregat granit semulajadi. Sebanyak enam campuran konkrit dengan peratusan penggantian yang berbeza terdiri daripada agregat RAP telah dihasilkan. Beberapa ujian telah dijalankan termasuk penilaian sifat fizikal dan mekanikal agregat RAP dan penilaian sifat fizikal dan mekanikal konkrit yang mengandungi agregat RAP yang kemudiannya dibanding dengan agregat normal dan campuran konkrit yang terdiri daripada aggregat normal. Untuk pencirian agregat RAP, bitumen yang terdapat pada permukaan agregat telah mempengaruhi prestasi fizikalnya manakala sifat mekanikalnya dipengaruhi oleh beban yang dikenakan ke atasnya semasa tempoh perkhidmatannya sebagai aggregat turapan asfalt. Untuk kesan agregat RAP terhadap sifat konkrit, dari segi sifat fizikal dan mekanikal, campuran konkrit dengan penggantian agregat RAP 30% telah dikenalpasti sebagai perkadaran campuran terbaik dalam semua aspek yang dikaji.
_______________________________________________________________________________________________________
Recycled asphalt pavement (RAP) can be referred as waste materials that is reclaimed and reprocessed to acquire the asphalt and aggregate. Most of the application of RAP is to be recycled back into pavement and thus, the suitability of the recycled aggregate from asphalt pavement to be used in other possible applications such as Portland cement concrete is not yet being determined. In this study, the effects of partial replacement of coarse aggregate by recycled aggregate from asphalt pavement on properties of concrete has been investigated. The recycled aggregate used was originated from asphalt pavement or recycled asphalt pavement (RAP) aggregate. RAP coarse aggregate was being obtained from JKR Penang and later been crushed into rubbles. The aggregate rubbles sieved and graded to sizes similar as natural crushed granite aggregate. Six concrete mixes with different percentage replacement were made from RAP coarse aggregate. Several tests were conducted including the assessment of physical and mechanical properties of RAP aggregate, as well as physical and mechanical properties of concrete containing RAP aggregate. The results are compared with natural crushed granite aggregate and concrete containing 100% natural crushed granite aggregate as the control mix. For the characterization of the RAP aggregate, the bituminous contaminant found on the surface of the aggregate has greatly influence its physical performance while its mechanical properties are affected by axle loads subjected during its service period as asphalt pavement. For the effects of RAP aggregate on properties of concrete, in terms of physical and mechanical properties, concrete mix with 30% RAP aggregate replacement has been identified as the best mix proportion in all aspects studied.
Effects of partial replacement of natural aggregate by recycled aggregate from asphalt pavement on properties of concrete / Farid Aizuddin Shubandrio