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Concrete Technology in the Century of the Environment
Published in K. Sakai, Integrated Design and Environmental Issues in Concrete Technology, 2014
The discussion of concrete recycling has centered on crushing waste concrete for use as aggregate, without ever considering the recycling of waste concrete back to a raw material state, as in the case of steel, aluminum, or paper. On the other hand, no one would think that steel and aluminum can be recycled simply by crushing or cutting. Why should recycling of concrete be discussed only in the realm of it remaining in the form of concrete as such? Can it not be returned to cement by calcining in a kiln? This shift of conception easily leads to the concept of completely recyclable concrete.
Green Economy and Sustainable Development
Published in Maniruzzaman A. Aziz, Khairul Anuar Kassim, Wan Azelee Wan Abu Bakar, Aminaton Marto, Syed Anuar Faua’ad Syed Muhammad, Fossil Free Fuels, 2019
Yusuf Babangida Attahiru, Maniruzzaman A. Aziz, Khairul Anuar Kassim, Wan Azelee Wan Abu Bakar
“Sustainable development is a development that the needs of the present without compromising the ability of future generations to their own needs.” According to this definition from the WCED (1987), it is clear that the various activities of the construction sector have to be regarded and analyzed when considering sustainable development [7]. Nowadays, principles of sustainability have become mandatory in order to tackle global warming and the associated climate change. The governments of several countries have adequate policies in place with a view to controlling and improving the current state of their construction industries [8]. Sustainable development remains the core principle of international environmental policymaking, and of national environmental planning in many countries. Indeed, the official institutions now promoting green growth insist that it is not a substitute for sustainable development but a way of achieving it [9]. Sustainable development is often presented as being divided into the economy, environment and society [10]. The improving social, economic and environmental indicators of sustainable development are drawing attention to the construction industry, which is a globally emerging sector, and a highly active industry in both developed and developing countries [11]. The three sectors are often presented as three interconnected rings [2]. These three convenient categories make analysis more straightforward. Frequent sustainable development is presented as aiming to bring the three categories together in a balanced way. The model usually shows equal-sized rings in a symmetrical interconnection, even though there is no reason why this should be the case, but if they are seen as separate, as the model implies, different perspectives can often give greater priority to one or the other [12]. The concept of sustainable development is the result of the growing awareness of the global links between mounting environmental problems, socioeconomic issues to do with poverty and inequality and concerns about a healthy future for humanity. It strongly links environmental and socioeconomic issues [6]. The subject of concrete recycling is regarded as being very important in the general attempt for sustainable development in our times [13]. In a parallel manner, it is directly connected with (a) increase of demolition structures past out of performance time, (b) demand for new structures and (c) destruction by drilling, deep excavation of trenches and natural phenomena such as earthquakes.
Environmental life cycle assessment of coarse natural and recycled aggregates for concrete
Published in European Journal of Environmental and Civil Engineering, 2018
Bruno Estanqueiro, José Dinis Silvestre, Jorge de Brito, Manuel Duarte Pinheiro
The deposition of CDW in landfills and the corresponding costs are increasing all over Europe. Therefore, concrete recycling and reuse as aggregates is very beneficial and enables the reduction of the volume of CDW, thereby protecting the environment and reducing environmental impacts produced by the construction sector. These benefits are in fact well known, but the shortcomings in implementing the process stop it from being widely accepted. The recycling of aggregates must be made through an optimised process in order to achieve sustainability in construction and reduce the consumption of resources and other environmental impacts over the coming years. Selective demolition of buildings greatly contributes to the efficiency of this recycling process, and this paper also shows that the option for this practice instead of traditional demolition can result on a decrease of more than 23% of the environmental impacts of this operation.
Combination of LCA and circularity index for assessment of environmental impact of recycled aggregate concrete
Published in Journal of Sustainable Cement-Based Materials, 2023
Abdinasir Kadawo, Madumita Sadagopan, Otto During, Kim Bolton, Agnes Nagy
In research related to concrete recycling, efforts are made to keep cement content constant in recipes while improvements in concrete quality are brought forth by quality improvements of recycled aggregates or by partly replacing cement with supplementary cementitious materials. Of this reason, the results of LCIA for all categories excepting for ODP are close to each other. For a better discernment of different concrete alternatives, the circularity index is related to the LCIA results.