Journal ArticleDOI
The greening of the concrete industry
TLDR
The concrete industry is known to leave an enormous environmental footprint on Planet Earth as discussed by the authors, which contributes to the general appearance that concrete is not particularly environmentally friendly or compatible with the demands of sustainable development.Abstract:
The concrete industry is known to leave an enormous environmental footprint on Planet Earth. First, there are the sheer volumes of material needed to produce the billions of tons of concrete worldwide each year. Then there are the CO2 emissions caused during the production of Portland cement. Together with the energy requirements, water consumption and generation of construction and demolition waste, these factors contribute to the general appearance that concrete is not particularly environmentally friendly or compatible with the demands of sustainable development. This paper summarizes recent developments to improve the situation. Foremost is the increasing use of cementitious materials that can serve as partial substitutes for Portland cement, in particular those materials that are by-products of industrial processes, such as fly ash and ground granulated blast furnace slag. But also the substitution of various recycled materials for aggregate has made significant progress worldwide, thereby reducing the need to quarry virgin aggregates. The most important ones among these are recycled concrete aggregate, post-consumer glass, scrap tires, plastics, and by-products of the paper and other industries.read more
Citations
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Journal ArticleDOI
Carbon dioxide equivalent (CO2-e) emissions: A comparison between geopolymer and OPC cement concrete
TL;DR: In this article, the authors present the results of comprehensive carbon footprint estimates for both geopolymer and OPC concrete, including energy expending activities associated with mining and transport of raw materials, manufacturing and concrete construction.
Journal ArticleDOI
Environmental impact and life cycle assessment (LCA) of traditional and ‘green’ concretes: Literature review and theoretical calculations
P. Van den Heede,N. De Belie +1 more
TL;DR: In this paper, the authors investigated the available literature on every step in the LCA of concrete and found that the adopted functional unit for which the environmental impact is calculated, influences the outcome significantly.
Journal ArticleDOI
A critical review and assessment for usage of recycled aggregate as sustainable construction material
TL;DR: In this paper, the authors provide an account of properties of concrete prepared with recycled aggregate, analyses the important findings on Recycled Aggregate Concrete (RAC) in the recent time and discusses the suitability of its usage in construction.
Journal ArticleDOI
Reusing ceramic wastes in concrete
TL;DR: In this article, the feasibility of using calcined-clay wastes in concrete was examined and it was shown that concrete with 20% cement replacement outperformed the control concrete mixtures concerning compressive strength, capillary water absorption, oxygen permeability and chloride diffusion.
Journal ArticleDOI
Thermal conductivity of concrete – A review
TL;DR: In this paper, a general equation for predicting the thermal conductivity of concrete is proposed based on data reported by researchers, and the results indicate that most researchers have measured the k-value of cement-based materials based on transient methods.
References
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Our common future ; by world commission on environment and development
G H Brundtland,M Khalid,S Agnelli,S A Al-Athel,B Chidzero,L M Fadika,Hauff,I Lang,S Ma,M M Botero,N Singh +10 more
TL;DR: In this paper, a method and system for monitoring brake performance in part-revolution clutch presses and the like comprising an overrun cam coupled to a switch for indicating passage of the press die beyond the nominal desired stop position and entry into a danger range is presented.
Journal ArticleDOI
Rubber-Tire Particles as Concrete Aggregate
Neil N. Eldin,Ahmed Senouci +1 more
TL;DR: In this paper, the authors examined strength and toughness properties of concrete in which different amounts of rubber-tire particles of several sizes were used as aggregate, and the concrete mixtures exhibited lower compressive and splitting-tensile strength than did normal concrete.
Reference BookDOI
Recycling of Demolished Concrete and Masonry
TL;DR: The RILEM report as discussed by the authors contains state-of-the-art reviews on three topics: recycling of demolished concrete, recycling of masonry rubble and localized cutting by blasting of concrete.
Journal ArticleDOI
High-Performance Concrete Incorporating Rice Husk Ash as a Supplementary Cementing Material
Min-Hong Zhang,V. Mohan Malhotra +1 more
TL;DR: In this article, the physical and chemical properties of rice husk ash (RHA) are investigated for both fresh and hardened concrete incorporating the same ash, and the properties of the RHA concrete are compared with those of the control Portland cement concrete and silica fume concrete.
Book
Waste Materials and By-Products in Concrete
TL;DR: Siddique as mentioned in this paper showed that many non-hazardous waste materials and by-products which are landfilled, can in fact be used in making concrete and similar construction materials.