358 research outputs found
Circular Economy for Transport Infrastructure: An Overview of the Sustainable Use of Recycled Asphalt Shingles in Asphalt Mixtures
No full textIn North America and Europe, asphalt shingle waste created during the installation of roofing membranes and tear-off shingles retrieved at the end of the membrane’s life cycle are two major sources of municipal solid waste. Since almost 15–35% of recycled asphalt shingles (RAS) consist of an asphalt binder, the effective recycling of RAS into asphalt mixtures could also allow a reduction in the consumption of non-renewable resources such as asphalt binders. In this context, several studies investigating the use of RAS in asphalt mixtures can be found in the literature, although they exhibit widespread and sometimes conflicting information about the investigated materials, the mix preparation and testing methodologies and the experimental findings. Given this background, this review paper aims at summarizing the existing information and research gaps, providing a synthetic and rational picture of the current literature, where similar attempts cannot be found. In particular, different research studies show that the use of RAS in asphalt mixtures is an economical as well as an eco-friendly option. RAS with up to 20% by weight of binder or 5% by weight of aggregate/mixtures (eventually in combination with 15% reclaimed asphalt pavement aggregate) were found to be relatively suitable to improve the performance properties of asphalt mixtures, both in the laboratory and in the field. Adding RAS to asphalt mixtures could enhance their stiffness, strength and rutting resistance (i.e., high-temperature properties), while negatively affecting the mixtures’ fatigue and thermal cracking resistance. However, the addition of specific biomaterials (e.g., bio-binders, bio-oils) or additives to asphalt mixtures can mitigate such issues, resulting in lower brittleness and shear susceptibilities and thus improving the anti-cracking performance. On the other hand, the literature review revealed that several aspects still need to be studied in detail. As an example, RAS-modified porous asphalt mixtures (fatigue, rutting, moisture susceptibility and thermal cracking) need specific research, and there are no comprehensive research studies on the effects of the RAS mixing time, size and mixing temperature in asphalt mixtures. Moreover, the addition of waste cooking/engine oils (biomaterials) as asphalt binder rejuvenators in combination with RAS represents an attractive aspect to be studied in detail
Recycling End-of-Life Bituminous Membranes in Asphalt Mixtures: A Laboratory Study
No full textThe circular economy (i.e., reuse and recycling of waste materials) is gaining attention for the goal of achieving net-zero waste. In this regard, the use of waterproofing membrane waste in bituminous materials can be a valid option, as every year, a lot of bituminous membrane wastes are generated both as production scraps or end-of-life wastes. Given this background, the recycling feasibility of end-of-life bituminous membrane waste (MW) in asphalt mixtures was assessed in this research study. To this aim, MW shreds (≤20 mm) were added to dense-graded bituminous mixtures using the dry-mixing method. The shreds were dosed at 0.5% by the mix weight (mix coded as SH−) or at 2% by mix weight (mix coded as SH+). A corresponding reference mix without MW was also tested for comparison purposes. The mixtures’ workability, strength and stiffness as well as permanent deformation, moisture and fatigue resistance were evaluated. Overall, the laboratory experimental findings showed that MW-modified bituminous mixtures with a higher dosage of membrane waste (SH+) have relatively higher moisture resistance, fatigue resistance, stiffness and high-temperature performance with respect to the corresponding reference mix. Moreover, both the reference and MW-modified mixtures showed similar workability regardless of the MW content
Politics and Exhaustion — with Asad Haider
No full textTheorist and author Asad Haider joins Below the Radar to discuss questions he explores in his book, Mistaken Identity: Race and Class in the Age of Trump. Asad discusses how class dynamics cannot be separated from identity-driven movements. As well, he explores ideas of political exhaustion in the tradition of political theorists such as Sylvain Lazarus and Alain Badiou. In this interview, Asad interrogates the role of identity in politics and how it has been taken up in discourse — complicating the relationship between race and class in a context that has been defined by capital interests. Asad and Am discuss theoretical questions around frameworks for political organizing and solidarity across movements. He also speaks to our current moment as one of political exhaustion, where it\u27s difficult to mobilize transformative political change
Pioneers of Library Movement in Pakistan
No full textThe paper aims to describe in brief the contribution of seven leaders of Pakistan librarianship, viz. K.B. Khalifa M. Asadullah, Prof. Dr. Abdul Moid, Dr. Abdus Subuh Qasimi, Muhammad Shafi, Fazal Elahi, Khawaja Nur Elahi and S. V. Hussain. The early library developments are given for better understanding of the role of these leaders
A critical analysis of Persian Poetry of Shah Turab Ali Qalandar
No full text<p>volume = {1}, number = {1}, author = {Zunnoorain Haider Alavi}, title = {A critical analysis of Persian Poetry of Shah Turab Ali Qalandar}, publisher = {Saurabh Chandra}, journal = {SOCRATES}, ISSN 2347-6869 year = {2013}</p
Hydraulic simulations to evaluate and predict design and operation of the Chashma Right Bank Canal
No full textIrrigation systems / Irrigation canals / Flow control / Velocity / Canal regulation techniques / Hydraulics / Simulation models / Design / Operations / Crop-based irrigation / Distributary canals / Water delivery / Policy / Protective irrigation / Water allocation / Water requirements / Sedimentation / Water distribution / Equity / Water conveyance / Pakistan / Chashma Right Bank Canal
Parution : Najam Haider, "Shi'i Islam. An Introduction", août-sept.2014, Cambridge University Press.
No full textAuthor: Najam Haider Publication planned for: September 2014 availability: available from September 2014 format: Paperback isbn: 9781107625785 Description During the formative period of Islam, in the first centuries after Muhammad's death, different ideas and beliefs abounded. During this period two particular intellectual traditions emerged, Sunnism and Shi'ism. Sunni Muslims endorsed the historical caliphate, while Shi'i Muslims, supporters of 'Ali, cousin of the Prophet and the fourth cal..
Book Review: negotiating in civil conflict: constitutional construction and imperfect bargaining in Iraq by Haider Ala Hamoudi
No full textIraq has been racked by ethnic and sectarian conflict, which intensified following the American invasion and continues today. In this book, Haider Ala Hamoudi explores how the country was able to draft a constitution that appeals to the country’s three main sects despite their deep disagreements. Illuminating the aims of the text and acknowledging the continued discussions after a constitution is ratified, the author emphasises the ‘negotiation’ in Negotiating in Civil Conflict, writes Ruth Houghton
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The Pilot-Judgment Procedure of the European Court of Human Rights.
No full textStructural human rights deficiencies in the member states of the European Convention of Human Rights have caused numerous individual applications to the European Court of Human Rights and are a considerable factor in the Court's persistent overload crisis. The Pilot-Judgment Procedure was devised to tackle these structural deficiencies and has become an important instrument of the Court. Dominik Haider examines to which extent the Pilot-Judgment Procedure is reconcilable with the European Convention on Human Rights. After an analysis of the member states' obligations to resolve structural deficiencies, the author asks if the European Court of Human Rights is empowered to take the procedural steps which are characteristic of the Pilot-Judgment Procedure. In particular, the Court's express orders are critically scrutinised
Parution : Najam Haider, "The Origins of the Shī'a. Identity, Ritual, and Sacred Space in Eighth-Century Kūfa", juillet.2014 (2011, 1 ère éd), Cambridge University Press.
No full textAuthor: Najam Haider Date Published: July 2014 availability: Available format: Paperback isbn: 9781107424951 Description The Sunni-Shi'a schism is often framed as a dispute over the identity of the successor to Muhammad. In reality, however, this fracture only materialized a century later in the important southern Iraqi city of Kufa (present-day Najaf). This book explores the birth and development of Shi'i identity. Through a critical analysis of legal texts, whose provenance has only recent..
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