scholarly journals Modeling materials flow of waste concrete from construction and demolition wastes in Taiwan

2002 ◽  
Vol 28 (1-2) ◽  
pp. 39-47 ◽  
Author(s):  
T.Y. Hsiao ◽  
Y.T. Huang ◽  
Y.H. Yu ◽  
I.K. Wernick
2011 ◽  
Vol 211-212 ◽  
pp. 1036-1040
Author(s):  
Ji Qing Zhu ◽  
Shao Peng Wu ◽  
Jin Jun Zhong ◽  
Dong Ming Wang

The construction and maintenance of roads in China require large amounts of aggregates and mineral filler. The use of recycled materials helps conserving natural resources. However, the inferior road performance and additional costs have hindered the widespread use of construction and demolition wastes (C&D wastes) in applications such as surface layers of asphalt pavement that may represent a value application for C&D wastes. Waste concrete, waste bricks and waste glass are selected for this study; and the surface layers of asphalt pavement is considered here as value application. Although there is a large potential for supplying C&D wastes now, a few barriers have effectively depressed the recycling activities. Such barriers are described here and a brief discussion suggests ways of their removal.


2019 ◽  
Vol 303 ◽  
pp. 05001
Author(s):  
Mónica Bedoya ◽  
Federico Rivera ◽  
María Rico ◽  
David Vélez ◽  
Andrés Urrego ◽  
...  

It is clear that construction and demolition wastes (CDW) are constantly increasing throughout the world and these wastes can be used effectively to minimize the consumption of natural resources in the manufacture of more sustainable concrete. The CDW occupy an important segment of world waste production and its generation reached approximately 3 billion tons in 2012 in 40 countries [1]. Although this topic has been studied in the world, it is still valid for the reuse of waste that is constantly increasing, and although in many countries there are already examples of its use this type of concrete in Colombia and in the Medellìn city lacks applications. This project proposes the application of a sustainable concrete made with CDW and coal ash in the Medellín city for its implementation in the construction of urban furniture. A university community diagnosis of the needs in terms of furnishing was made. With the design reached, a modular chair was proposed to enable spaces within the university. The mechanical characteristics of the concrete and the design of the chair are evaluated and a simulation is done through finite elements to evaluate the viability of the proposed concrete, finding that with these properties is possible to manufacture durable and sustainable furniture that serves as an example for the application of sustainable materials


2021 ◽  
Vol 570 (1) ◽  
pp. 218-227
Author(s):  
Yu Haiyan ◽  
Ren Zhixiao ◽  
Qiu Cuina ◽  
Hu Lintong

2021 ◽  
Vol 4 (1) ◽  
pp. 3-27
Author(s):  
Irus Braverman

Our special issue provides a first-of-its kind attempt to examine environmental injustices in the occupied West Bank through interdisciplinary perspectives, pointing to the broader settler colonial and neoliberal contexts within which they occur and to their more-than-human implications. Specifically, we seek to understand what environmental justice—a movement originating from, and rooted in, the United States—means in the context of Palestine/Israel. Moving beyond the settler-native dialectic, we draw attention to the more-than-human flows that occur in the region—which include water, air, waste, cement, trees, donkeys, watermelons, and insects—to consider the dynamic, and often gradational, meanings of frontier, enclosure, and Indigeneity in the West Bank, challenging the all-too-binary assumptions at the core of settler colonialism. Against the backdrop of the settler colonial project of territorial dispossession and elimination, we illuminate the infrastructural connections and disruptions among lives and matter in the West Bank, interpreting these through the lens of environmental justice. We finally ask what forms of ecological decolonization might emerge from this landscape of accumulating waste, concrete, and ruin. Such alternative visions that move beyond the single axis of settler-native enable the emergence of more nuanced, and even hopeful, ecological imaginaries that focus on sumud, dignity, and recognition.


2021 ◽  
Vol 11 (14) ◽  
pp. 6265
Author(s):  
Alessandra Diotti ◽  
Giovanni Plizzari ◽  
Sabrina Sorlini

Construction and demolition wastes represent a primary source of new alternative materials which, if properly recovered, can be used to replace virgin raw materials partially or totally. The distrust of end-users in the use of recycled aggregates is mainly due to the environmental performance of these materials. In particular, the release of pollutants into the surrounding environment appears to be the aspect of greatest concern. This is because these materials are characterized by a strong heterogeneity which can sometimes lead to contaminant releases above the legal limits for recovery. In this context, an analysis of the leaching behaviour of both CDWs and RAs was conducted by applying a statistical analysis methodology. Subsequently, to evaluate the influence of the particle size and the volumetric reduction of the material on the release of contaminants, several experimental leaching tests were carried out according to the UNI EN 12457-2 and UNI EN 12457-4 standards. The results obtained show that chromium, mercury, and COD are the most critical parameters for both CDWs and RAs. Moreover, the material particle size generally affects the release of contaminants (i.e., finer particles showed higher releases), while the crushing process does not always involve higher releases than the sieving process.


LWT ◽  
2021 ◽  
pp. 111606
Author(s):  
Marta Castrica ◽  
Claudia Balzaretti ◽  
Dino Miraglia ◽  
Patrizio Lorusso ◽  
Annamaria Pandiscia ◽  
...  

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