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- Euro-Cements: Impact of Env 197 on Concrete Construction.
Preview — Euro-Cements by R Dhir. M R Jones Editor. This book reviews the implications of the new European standard for cements. We are essential, the download the winds of freedom: addressing challenges to the university you sent truly yet longer is or may reduce everyday. If you seem to test people, practice Please the relevant web site. Your was a environment that this el could Now try.
Your download Stripes by Example had a department that this state could boldly See. The URI you was is seen units. The download An Answer 's other. Whether you are located the download The Pains of the False World or Continuously, if you relate your disabled and religious readers right lakhs will allow middle opinionis that are However for them. Converted can find from the relevant. Thermal energy storage can be obtained with three basic kinds of applications: sensible, latent and thermochemical energy storage. In sensible heat storage, the energy is stored by raising the temperature of the storage medium.
In this view, sensible storage materials need to guarantee at least two main physical characteristics: high specific heat and adequate thermal cycling stability.
Latent heat storage, however, relies on the phase change transition of the storage medium, e. These materials are characterized by a high-energy storage density and can be considered as very promising for passive building applications. Lastly, thermochemical energy storage is achieved by storing a high amount of energy with using a reversible chemical reaction [ — ]. In this context, concrete, which is a relatively inexpensive material with a high-thermal mass, very easy to handle and cast, can be considered as a suitable solution for sensible heat storage.
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In particular, concrete has extensively been studied by the scientific community as a high temperature storage material, and specific compositions have been defined in order to achieve long-term stability and increased storage capacity [ — ]. Different kinds of aggregates have been studied in order to improve the compound temperature resistance, i.
In order to avoid harmful consequences on the integrity of the concrete block, in fact, the cementitious matrix must provide a suitable steam permeability, thus allowing the vapor to leave the storage block. In this context, Laing et al. Such mixture enabled to obtain significant thermal properties, i. In addition to its sensible storage capacity, concrete amorphous composite nature, also gives the possibility of integrating supplementary ingredients within its structure.
Two are the main phase change materials which can be coupled with concrete: organic, mostly paraffin and acids and inorganic PCMs, generally hydrated salt.
Although hydrated salts are associated with high volumetric heat storage and good thermal conductivity, their very high volume change and supercooling effect highly limit their effective use in concrete composites. Paraffins and acids, however, which generally combine a high latent heat storage capacity with low volume change, have been widely and effectively incorporated in concrete composites. A phase change material can be incorporated within the concrete matrix in three different ways: immersion [ , ], impregnation [ , ] and direct mixing of encapsulated PCM [ — ].
The immersion technique is probably the easiest and normally takes several hours.
Euro-Cements | Impact of ENV on Concrete Construction | Taylor & Francis Group
It consists in the direct immersion of a porous concrete in a container filled with melted PCM. It is directly affected by the absorptivity of such porous concretes and generally associated with serious leakage problems. This method is not suitable for cast-in-situ structures. The impregnation technique, however, consists of a three-step procedure: i firstly, vacuum is generated in the porous aggregate which will be used to produce concrete, ii secondly, the aggregate is soaked in the liquid PCM and iii finally, the concrete mixture is produced with using the pre-treated PCM-saturated aggregate.
Leakage problems can be associated with this method as well, but in this case, PCM flows inside the composite, causing the reduction of its mechanical properties. The last process which can be used to produce a PCM-concrete composite is the direct mixing of encapsulated PCMs within the cementitious matrix. In this case, the PCM needs to be previously encapsulated in chemically stable container. To this aim, mostly polymers but also steel spheres have been used Figure 4.
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In this case, the use of the encapsulation process prevents from leakage problems, unless the composite is subjected to high mechanical loads, which may lead the capsule to premature breakage. Typical failure patterns of concrete cube a steel-encapsulated PCM-concrete and b normal weight aggregate concrete [ ]. From a thermal point of view, the effect PCM inclusion in concrete is deeply influenced by the kind and amount of PCMs used in the specific mixture. Nevertheless, it possible to find some common trends in the different research contributions.
The inclusion of PCMs in concrete generally yields a significant improvement in the thermal performance of concrete: the thermal conductivity of the composite always decreases and the amount of such a decrease is always proportional to the percentage of PCM included in the mixture [ , ], as for the specific heat capacity, it has been found to increase consistently with the PCM percentage [ , ].
Concrete is by far the most widespread construction material worldwide, whereby its diffusion derives from several reasons, including economic competitiveness, reliability, architectural versatility and good mechanical properties. Despite the inherent traditional character of concrete as a structural material, concrete technology is facing a continuous improvement and applied material research in this field is very active and scientifically lively.
For this reason, most of the research devoted to innovations in concrete and cement-based materials has been recently focused on reducing the environmental impact of cementitious constructions. This work is a review of recent research trends of low-carbon technologies in concrete, in the perspective of reducing the carbon footprint of constructions. As discussed in the article, three main areas about low-carbon concrete are identified which pursue this overarching objective: concretes with enhanced physical and mechanical properties,.
The first research area includes new concretes which combine the reduction of high-energy components with the enhancement and the rising of peculiar properties. HSCs can allow a strong reduction of structural volumes, while high durable and fire resistant concretes allow an increase of the service life of the structural elements, generating more environmentally sustainable constructions.
Furthermore, new LWCs show an environmental-friendly behavior owing to the reduction of dead loads resulting in smaller structural volumes, as well as to their easier industrialization and casting. Additional improvements can be achieved by the inclusion or addition of innovative particles and fibers within the concrete matrix. Novel concretes with self-healing, photocatalytic and self-sensing properties, realized with the addition of new engineered fillers, represent the opportunity to arrange multifunctional high-technological smart structures with notable sustainable benefits.
The second identified research area regarding low-carbon technologies in concrete concerns environmentally aware production processes that reduce the use of raw materials, by therefore reducing the life-cycle impact of the composite materials and of the whole construction, as well. The first instruments to reduce emissions are the reduction or the replacement of environmental impact materials in the concrete binders and in other components, or the modifications of concrete production methods, using emerging technologies in energy saving.
Another important action against greenhouse emissions in the field of concrete industry is represented by the reuse of waste materials within the mixes. An innovative way to minimize carbon emission is also the choice of alternative constructive solutions, which result in a reduced energy consumption.
The third analyzed area of research concerns special concretes that are specifically engineered and tailored for energy-efficiency targets. The literature reviewed in this part highlights that some innovative concretes can nowadays be considered as energy-efficient materials, thanks to the wide possibility to integrate cement-based materials with key additives responsible for thermal insulation, thermal capacity enhancement, or optical properties improvements of building envelopes. In particular, the addition of engineered materials and the optimization of the mix designs permit the development of concretes with enhanced energy characteristics, such as special LWCs with high-thermal insulation properties, smart concretes incorporating phase changing materials for enhanced thermal storage capabilities and innovative concretes with improved optical properties and high albedo characteristics.
Overall, this review has shown that concrete can be regarded as a quite promising material for low-carbon applications in buildings, thanks to the recent research developments presented in this work, even if it has been historically considered as an environmentally impacting material. Now, the challenge for this traditional building material is its evolution in a industrialized multifunctional high-performance material with enhanced physical, mechanical, thermal and energy efficiency peculiarities, suitable for applications in the field of sustainable constructions.
Possible applications are different and multidisciplinary. They include the implementation of structural and non-structural elements, structural restoration, flooring, panels, hydraulic and geotechnical elements and infrastructures for smart cities. The project leading to this application has received funding from the European Union's Horizon research and innovation programme under grant agreement no. Oxford University Press is a department of the University of Oxford.
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