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Pengaruh penambahan serbuk crumb rubber menggunakan filler abu sekam padi pada asphalt concrete - wearing course di tinjau dari karakteristik marshall
Full text linkTingginya pertumbuhan volume lalu lintas menyebabkan kemungkinan terjadi kerusakan lapisan jalan akibat overload juga meningkat, untuk itu muncul pemikiran untuk mencari antisipasi sekaligus solusi untuk masalah ini dengan memperbaiki kualitas lapis perkerasan. Konstruksi perkerasan AC (Asphalt Concrete)/ Laston, merupakan konstuksi jalan yang sangat di sarankan untuk di gunakan di indonesia mengingat indonesia memiliki iklim tropis yang memiliki suhu yang relatif tinggi. Di sisi lain juga peneliti melihat banyak material limbah yang di anggap berpotensi untuk di gunakan sebagai bahan additive dan di yakini dapat meningkatkan stabilitas maupun durabilitas campur perkerasan.
Pada penelitian ini akan di gunakan crumb rubber sebagai bahan additive dan abu sekam sebagai filler pengganti dari abu batu, yang mengacu pada Spesifikasi Umum dari Bina Marga 2010 (revisi 3). Metode yang di pakai yaitu dengan mencari KAO terlebih dahulu dengan variasi kadar aspal 5%, 5,5%, 6%, 6,5%, dan 7% , Setelah mendapatkan KAO dari perhitungan karakteristik marshall, maka di lakukan pencampuran hotmix kembali dengan memakai KAO dan penambahan variasi serbuk crumb rubber sebesar 2% ,4% ,6% ,8% , 10%, dan 0% sebagai pembanding.
Dari hasil pengujian hasil campuran dengan crumb rubber optimum 5,73%, menunjukkan bahwa penambahan crumb rubber dapat memenuhi spesifikasi umum dari bina marga 2010 (revisi 3). Adapun nilai yang di dapatkan dari uji marshall antara campuran dengan dan tanpa crumb rubber adalah ; Flow (dengan = 2,93mm, tanpa = 3,23mm), VIM (dengan = 3,526%, tanpa = 3,629%), VMA (dengan = 17,28%, tanpa = 17,32%), Stabilitas (dengan = 1067,522kg, tanpa = 883,47kg), MQ (dengan = 347,776kg/mm, tanpa = 300,77kg/mm), dan VFA (dengan = 79,525%, tanpa = 79,04%), dari penjelasan di atas dapat di tarik kesimpulan bahwa penambahan crumb rubber dapat menaikkan nilai Stabilitas, MQ, dan VFA, namun menurunkan nilai Flow, VIM, dan VMA
KARAKTERISTIK ASPHALT CONCRETE-BINDER COURSE DENGAN PASIR SILIKA BANGKA SEBAGAI AGREGAT HALUS
Full text linkAbstract
Currently, the need for materials for road construction, especially aggregates, is increasing. In line with this, the provision of fine aggregate for road construction requires a relatively high cost. Therefore, the use of Bangka silica sand can be an alternative to meet the needs of the fine aggregate. This study aims to determine the effect of Bangka silica sand, which is used as fine aggregate, on the characteristics of the asphalt mixture used as a road pavement layer, especially the binder course. This research was conducted on 2 types of asphalt mixtures, namely asphalt mixtures using ordinary crushed stone and asphalt mixtures using silica sand from Bangka Island. Mix design to obtain a design mix formula is carried out using the Marshall method and based on the 2018 General Specifications of Bina Marga Revision 2, for the Roads and Bridges Sector. After obtaining the optimum asphalt content values, specimens with the optimum asphalt content were made, and then the mixture characteristics were tested using the Marshall test. The experimental results showed that the optimum asphalt content for the mixture using ordinary crushed stone was 5.5% and for the mixture using Bangka silica sand was 5.9%. The Retained Marshall Stability indexes for the mixture using ordinary crushed stone and Bangka silica sand were 94.6% and 90.8%, respectively, which means that both types of mixture meet the requirements.
Keywords: asphalt mixture; aggregate; fine aggregate; silica sand; optimum asphalt content
Abstrak
Saat ini kebutuhan material untuk pembangunan jalan, khususnya agregat, semakin meningkat. Sejalan dengan hal tersebut, penyediaan agregat halus untuk konstruksi jalan membutuhkan biaya yang relatif mahal. Karena itu, pemanfaatan pasir silika Bangka dapat menjadi suatu alternatif untuk memenuhi kebutuhan agregat halus tersebut. Studi ini bertujuan untuk menentukan pengaruh pasir silika Bangka, yang digunakan sebagai agregat halus, terhadap karakteristik campuran beraspal yang digunakan sebagai lapis perkerasan jalan, khususnya lapis antara atau binder course. Penelitian ini dilakukan pada 2 jenis campuran beraspal, yaitu campuran beraspal yang menggunakan batu pecah biasa dan campuran beraspal yang menggunakan pasir silika yang berasal dari Pulau Bangka. Perancangan campuran untuk mendapatkan design mix formula dilakukan dengan menggunakan metode Marshall dan berdasarkan pada Spesifikasi Umum Bina Marga 2018 Revisi 2, untuk Bidang Jalan dan Jembatan. Setelah diperoleh nilai kadar aspal optimum, dibuat benda-benda uji dengan kadar aspal optimum tersebut, dan selanjutnya dilakukan pengujian terhadap karakteristik campuran dengan pengujian Marshall. Hasil percobaan menunjukkan bahwa nilai Kadar Aspal Optimum campuran yang menggunakan batu pecah biasa adalah 5,5% dan untuk campuran yang menggunakan pasir silika Bangka adalah 5,9%. Indeks Kekuatan Sisa untuk campuran yang menggunakan batu pecah biasa dan yang menggunakan pasir silika Bangka, berturut-turut, adalah 94,6% dan 90,8%, yang berarti kedua jenis campuran memenuhi persyaratan.
Kata-kata kunci: campuran beraspal; agregat; agregat halus; pasir silika; kadar aspal optimu
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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