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This open access book explores the strategic importance and advantages of adopting multidisciplinary and multiscalar approaches of inquiry and intervention with respect to the built environment, based on principles of sustainability and circular economy strategies. A series of key challenges are considered in depth from a multidisciplinary perspective, spanning engineering, architecture, and regional and urban economics. These challenges include strategies to relaunch socioeconomic development through regenerative processes, the regeneration of urban spaces from the perspective of resilience, the development and deployment of innovative products and processes in the construction sector in order to comply more fully with the principles of sustainability and circularity, and the development of multiscale approaches to enhance the performance of both the existing building stock and new buildings. The book offers a rich selection of conceptual, empirical, methodological, technical, and case study/project-based research. It will be of value for all who have an interest in regeneration of the built environment from a circular economy perspective.
Development of Ultra-High Performance Concrete against Blasts: From Materials to Structures presents a detailed overview of UHPC development and its related applications in an era of rising terrorism around the world. Chapters present case studies on the novel development of the new generation of UHPC with nano additives. Field blast test results on reinforced concrete columns made with UHPC and UHPC filled double-skin tubes columns are also presented and compiled, as is the residual load-carrying capacities of blast-damaged structural members and the exceptional performance of novel UHPC materials that illustrate its potential in protective structural design. As a notable representative, ultra-high performance concrete (UHPC) has now been widely investigated by government agencies and universities. UHPC inherits many positive aspects of ultra-high strength concrete (UHSC) and is equipped with improved ductility as a result of fiber addition. These features make it an ideal construction material for bridge decks, storage halls, thin-wall shell structures, and other infrastructure because of its protective properties against seismic, impact and blast loads. Focuses on the principles behind UHPC production, properties, design and detailing aspects Presents a series of case studies and filed blast tests on columns and slabs Focuses on applications and future developments
Concrete is the most widely utilized construction material in the world. Thus, any action intended to enhance the sustainability of the construction industry must consider the supply chain, production, distribution demolition and eventual disposal, landfilling or recycling of this composite material. High-performance concrete may be one of the most effective options to make the construction sector more sustainable. Experience proves that the use of recycled concrete aggregates, as well as the partial replacement of ordinary Portland cement with other supplementary cementitious materials or alternative binders, are generally accepted as the most realistic solutions to reduce the environmental impacts, leading to sufficiently high mechanical performances. In structural applications such as those concerning the seismic and energy retrofitting of existing buildings, the use of high-performance cementitious composites often represents the more cost-effective solution, which allows us to minimize the costs of the intervention and the environmental impact. Eventually, the challenge of enhancing sustainability by raising durability of concrete structures is particularly relevant in those applications where maintenance is particularly expensive and impactful, in terms of both direct intervention costs and indirect costs deriving from downtime. The present Special Issue aims at providing readers with the most recent research results on the aforementioned subjects and further foster a collaboration between the scientific community and the industrial sector on a common commitment towards sustainable concrete constructions.
"The dissertation presented here discusses research to develop improved methods of material selection for the production of high-performance concrete and to examine the behavior of these materials in structural applications. The results of the research have been submitted for publication in five conference proceedings and technical journals. The first paper investigates a particle packing model for determination of the optimal proportions of materials for high performance concrete. Since concrete with higher strength and durability will have a higher packing density, this research used particle packing to optimize a mix to achieve the maximum density. The model was used to produce high-strength concrete with a reduced amount of cement. The second paper studies the shrinkage behavior of high-strength concrete subjected to accelerated curing. It shows that shrinkage is reduced with increasing curing temperatures and presents correction factors for current prediction equations. The third and fourth papers, published as a two-part series, examine the behavior of prestressed concrete girders produced with self-consolidating concrete and subjected to elevated compressive fiber stress levels. Members were monitored to examine the prestress loss behavior and the camber development over time, then tested to failure for prediction comparison. Flexural behavior was predicted with relative accuracy, but the shear behavior showed the need for additional test data. The final paper examines the effect of reduced concrete elastic modulus values on the performance of prestressed concrete girders. At maximum span lengths, the increase in live load deflection over allowable limits is reason for concern when reduced elastic modulus values are found"--Abstract, leaf iv.
When produced correctly, concrete can be extremely strong, with high load-bearing capacity and superior durability. Another noteworthy property is the relatively low amount of energy and resources consumed during production. Super-High-Strength High Performance Concrete brings together the results of a major research project by the National Natural Science Foundation of China and the Doctoral Foundation of the Ministry of Education of China. This ten-year project explored the properties, performance, and potential of super-high-strength high performance (SHSHP) concrete. With a view towards improved production that optimizes the strength and durability of concrete, the book presents a host of topics on the cutting edge of concrete research. These include: A new method for the specific strength analysis of the pozzolanic effect of active mineral admixtures Analysis of the strength composition of SHSHP concrete Optimization of raw materials and mix proportion parameters for strength and flowability Analysis of the mechanical properties, deformation, and durability of SHSHP concrete Methods for decreasing autogeneous shrinkage Testing methods for SHSHP concrete The book concludes with a consideration of the practical and economic benefits of these optimized concretes. A systematic study of the different aspects of this essential commodity as well as the future direction of concrete science and technology, this book is a valuable resource for material scientists and engineers engaged in developing better structures.
This state-of-the-art report summarizes the results of an extensive search and review of available literature on the mechanical properties of concrete, with particular reference to high performance concrete for highway applications. Included in the review and discussion are the behavior of plastic concrete as well as the strength and deformation characteristics of hardened concrete. Both short-term and long-term effects are considered. Based on the review of the available information, research needs are identified. It is concluded that much research is needed to develop data on the strength and durability properties of concrete which develops high strength, particularly very early strength.
Bachelor Thesis from the year 2019 in the subject Engineering - Civil Engineering, grade: 4.0, University of Engineering & Technology Peshawar, course: Project, language: English, abstract: This study introduces the need, difficulties associated with and solutions for implementing the use of High Strength Concrete in Peshawar and challenging areas in general. It does so by using Peshawar as a case study and generalizing its characteristics to any other such regions in the world. It reviews current standard methods for making High Strength Concrete in the world and investigates those used in the target region. Then compares them to find the difficulties that stand as a hindrance in achieving High Strength Concrete in said area, naming them as challenges. It uses the PEC (Pakistan Engineering Council) contractors’ categorization to provide guidelines for each category to tackle the challenge that hinders it the most. Furthermore, it provides a set of actions for PEC to follow for a successful implementation of High Strength Concrete in the area. It also gives a review of the process for use in other challenging environments, also giving examples of such environments in Pakistan and other parts of the world.