Cause of occurrence damage and decrease of road pavement strength is low strength and durability in a mixed layer (AC-WC). To overcome this problem, it is necessary to improve the quality of road pavement in aggregate, filler, and asphalt composition. Filler serves to isolate the cavities between the aggregate particles so as to increase the density of the mixture. In general, the filler of stone ash has been used. However, it is important to find for other alternative materials which utilizing waste materials such as dregs of bagasse. The content of silica (SiO2) in ashes of bagasse is very high, 42.47%, thus it is expected to improve the quality of asphalt mixture. This study aims to determine the effect of using ashes of bagasse over the characteristics of mixed laston layer (AC-WC) with the addition of bagasse ash from 0%, 25%, 50%, 75% and 100%. This study refers to the 2010 Bina Marga Specification Revision 3 Year 2014. The results show that the addition of ash of bagasse has increased stability value. In general, the characteristic values that meet the requirements are found in the composition of 50% filler ash of bagasse asphalt at 5.87%, VIM value of 4.61%, VMA 18.41%, flow 3.17 mm and stability is 1344 , 04 kg.
The increasing use of concrete in construction has caused an increase in the need for resources for concrete mixtures and driving wide-scale mining. One alternate material that can be used for aggregates replacement is coral. Coral aggregates (CA) have similar chemical characteristics to cement. The compressive strength and tensile splitting strength tests of concrete coral aggregates were performed based on the ASTM and ACI standards. This study aims are to investigate the usage of CA as a partial replacement of cement and fine aggregate to increase the strength of concrete at substitution percentages of 0, 5, 10, and 15%. Two different water submerged scenarios of distilled water and salt sea water immersion were applied. The concrete strength test was carried out after 28 days of curing time, with the specified concrete quality of 17 MPa. The results showed that immersion in distilled water has a higher concrete strength than immersion in sea water. The maximum compressive strength of concrete for distilled and sea water immersion is for 0% CA content of 18.47 and 14.89 MPa, respectively. Moreover, the highest value of the split tensile strength of concrete with distilled and sea water immersion is for CA substitution of 5% of 2.52 and 2.5 MPa, respectively. The addition of 5% coral aggregates to cement and fine sand is the optimum combination since it increases the maximum split tensile strength of concrete.
Pemanasan global merupakan kejadian yang selalu berulang-ulang di dalam kehidupan manusia, di mana sinar matahari yang masuk ke dalam lapisan bumi, sebahagian diserap oleh bumi dan sebahagian lagi dipantulkan dan terperangkap di dalam bumi. Manusia selaku makhluk hidup di muka bumi berperan dalam menjaga pemanasan global. SMP Negeri 3 Ingin Jaya, Aceh Besar merupakan sekolah yang terletak di belakang toko-toko berlokasi di jalan Bandara Sim, Siron, Kecamatan Ingin Jaya, Kabupaten Aceh Besar. Lokasinya yang sedikit tertutup oleh toko-toko dan kurang adanya pepohonan, maka diperlukan solusi dalam hal mengatasi pemanasan global. Tujuan pengabdian ini adalah untuk menciptakan kepedulian guru dan siswa/i dalam mengurangi pemanasan global. Metode yang dilaksanakan adalah penyuluhan kepada guru dan siswa/i. Pengabdian tersebut bermula dari survey ke lapangan, diskusi dengan kepala sekolah, wawancara lisan dengan guru dan siswa/i, serta penyuluhan. Sosulsi yang ditawarkan untuk mengatasi pemanasan global, yaitu: membangun ruang terbuka hijau (dengan luas minimal 30% dari luas keseluruhan tanah), penggunaan energi alternatif, pendidikan ke masyarakat luas, dan beton ramah lingkungan. Hasil akhir dari pengabdian ini yaitu meningkatnya kesadaran dan pemahaman guru dan siswa/i terhadap pemanasan global.
Beton aspal merupakan salah satu jenis perkerasan lentur (flexible pavement) yang material nya terdiri dari agregat kasar, agregat halus, filler dan menggunakan aspal sebagai bahan pengikat. Ketersediaan aspal sebagai bahan pengikat semakin menurun seiring dengan semakin menurunnya ketersediaan aspal dunia. Untuk mengatasi permasalahan tersebut perlu di cari alternatif pengganti yaitu dengan mengembangkan aspal modifikasi dengan cara mensubtitusikan sebagian dari jumlah aspal dengan bahan polimer untuk menghemat penggunaan aspal tanpa mengurangi kualitas dari campuran yang diharapkan dapat meningkatkan kinerja stabilitas. Salah satu bahan yang digunakan pada penelitian ini adalah getah karet. Maka perlu penambahan bahan lain pada penelitian ini di gunakan getah karet. Untuk bahan campuran aspal getah karet adalah cairan yang berwarna putih yang di dapat dari sadap pohon karet. Rumusan masalah yang akan dibahas dalam penelitian ini dalah beberapa persen pengaruh pemanfaatan getah karet untuk subtitusi aspal modifikasi lapisan asphalt concrete wearing course (AC-WC) dengan metode basah. Tujuan yang ingin dicapai dari penelitian ini adalah untuk mengetahui apakah limbah plastik dapat digunakan sebagai bahan substitusi campuran Asphalt Concrete – Wearing Course (AC- WC) sebagai salah satu cara untuk mengurangi masalah getah karet yang terus meningkat setiap harinya oleh aktivitas masyarakat. Metode yang digunakan dalam penelitian ini yaitu metode basah yang mengacu pada Spesifikasi Bina Marga 2010 Revisi empat (2018). Pengujian karakteristik Marshall dilakukan pada 5 (lima) kadar aspal untuk menentukan kadar aspal optimum (KAO). Selanjutnya pada kondisi KAO direncanakan pembuatan benda uji dengan variasi persentase getah karet 3%, 6%, 9%, 12%, dan 15%. Hasil yang diperoleh untuk substitusi terbaik adalah persentase getah karet 6% dengan kadar aspal 5,50% didapat nilai VIM 3,80, VMA 17,08%, VFA 78,32%, Stabilitas 1220,99 kg, dan Flow 2,67 mm, semua nilai memenuhi spesifikasi yang ditentukan oleh Bina Marga 2010 Revisi 4 (2018).
In general, aggregates consist of Natural Aggregates (NA) and Artificial Aggregates (AA). Artificial aggregates, such as Crushed Stone (CS), are aggregates produced through the crusher industry which has a rough and angular surface so that it has excellent adhesion to asphalt. Meanwhile, NA is an aggregate produced from a river which has a smooth and large hollow surface texture. The cost for AA is very expensive when compared to NA, so it is necessary to experiment with mixing NA and AA to minimize the use of AA. NA are obtained from Sungai Jalin, Jantho City District, Aceh Besar District. The method used refers to the specification of Bina Marga 2010 Revision four (2018) and the Indonesian National Standard (SNI). The purpose of this study was to see the effect of the combination of NA and AA as a substitute for coarse aggregate on the AC-WC concrete asphalt layer. The specimens used were 66 specimens with substitution of NA and AA into the asphalt layer were 0% NA: 100% AA, 25% NA: 75% AA, 50% NA: 50% AA, 75% NA: 25% AA, 100% NA : 0% AA. Based on the research results, the best value for the optimum marshall parameter is the substitution of 25% AA: 75% BP at asphalt content of 5.00%, the stability value is 1492.37kg with a VIM value of 3.69%, VMA 16.17%, VFA 77.88% and MQ 573.87kg / mm which have met the requirements of the 2010 Revision four (2018) Bina Marga specification.
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