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Traces On The Appalachians

Author: Kevin T. Dann
Publisher:
ISBN:
Size: 40.27 MB
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There is an imaginary line, a green line made of rock called serpentine, that stretches along the eastern part of North America, from Georgia to Newfoundland. This line marks the ancient "geosuture"-the joining place of the North American and Eurasian continents during the geologic past. Kevin Dann's Traces on the Appalachians is a natural and human history of serpentine. Geologists have pondered the serpentine for the story it tells of earth history. The gray-green serpentine outcroppings represent traces of the earth's mantle, transported by sea-floor spreadings and thrust into the margins of the continent. They mark the collisions of tectonic plates and the birth of mountain chains. Botanists have puzzled over the strange plants that hopscotch their way along the dotted serpentine line, unable to live on more hospitable soil. To archaeologists, the artifacts carved from serpentine's companion rock, soapstone or steatite, have yielded precious clues to the human past. Native Americans used soapstone for heating-stones, bowls, pipes, and oil lamps. Vikings gratefully recognized the soft stone in the New World and fashioned it into their own household objects. Today, we put it to use in pancake griddles, wood stoves, and chemistry lab sinks. Writing in the tradition of John McPhee, Kevin Dann brilliantly interweaves new and old science with tales of human endeavor, local history, and personal exploration. Any reader with a taste for natural history will want to join his search for serpentine.

Glassfibre Reinforced Concrete

Author: Peter J. M. Bartos
Publisher:
ISBN: 9781849953269
Size: 28.30 MB
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Glassfibre reinforced concrete (GRC) is the most complex material widely used in current construction practice. It is an unusual composite, in which both the matrix and the reinforcement themselves are composites. This book provides guidance on the properties, its specification, testing and the latest methods for efficient production. Detailed information is presented about the unique aspects of the internal structure and fracture mechanisms of GRC and how the latest advances in nanotechnology are leading towards a fuller understanding of the rational design of GRC and the potential for further improvement of properties beyond those used in contemporary construction practice.GRC is already firmly established as the high-tech material of choice for architects and designers and recent decades have witnessed a rapid increase in production of GRC world-wide. However, to provide the full picture and encompass the most recent developments in GRC and how it can be exploited in major projects, a substantial part of the book is made up of case studies. GRC has been always a very versatile material; however, its range of practical applications has grown significantly. From small, simple items (flowerpots, drainage channels, window sills, etc.) to large-scale, high-tech iconic projects from leading architects, where GRC has to cope with the highest demands regarding structural complexity, freedom of shape, striking appearance combined with durability and overall quality and excellent environmental performance. The composite is well used in the reconstruction of complex historic facades and GRC has moved beyond construction into the domain of art and interior decorations and furniture. The case studies show numerous examples of such designs and products, including recently developed large double-curved panels with unusual surfaces and strong colours, and self-cleaning and photocatalytic (air-cleaning) e-GRC.

Composite Structures 4

Author: I.H. Marshall
Publisher: Springer Science & Business Media
ISBN: 9400934556
Size: 21.80 MB
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The papers contained herein were presented at the Fourth International Conference on Composite Structures (ICCS/4) held at Paisley ColIege of Technology, Scotland in July 1987. The Conference was organised and sponsored by Paisley College of Technology. It was co-sponsored by the Scottish Development Agency, the National Engineering Laboratory, the US Air Force European Office of Aerospace Research and Development and the US Army Research, Development and Standardisation Group- UK. It forms a natural and ongoing progression from the highly successful First, Second and Third International Conferences on Composite Structures (ICCS/I, ICCS/2 and ICCS/3) held at Paisley in 1981, 1983 and 1985 respectively. There is little doubt that composite materials are rightfulIy claiming a prominent role in structural engineering in the widest sense. Moreover, the range and variety of useful composites has expanded to a level inconceivable a decade ago. However, it is also true that this increasing utilisation has generated an enhanced awareness of the manifold factors which dictate the integrity of composite structures. This is indeed a healthy attitude to a relatively new dimension in structural engineering which will have an increasingly dominant role as the century progresses. Both the diversity of application of composites in structural engineering and the endeavours which wilI ensure their fitness for purpose are reflected herein.

Analysis Of Fracture Tests Of Glass Fibre Reinforced Cement Grc Using Digital Image Correlation

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Size: 21.23 MB
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Highlights: GRC fracture energy was obtained in three formulations and two orientations. A 25% addition of metakaolin caused a noticeable increment of GRC fracture energy. In all formulations similar fracture energies were found regardless of orientation. Multicracking was responsible of the fracture energy increment. DIC was suitable for fracture tests and helped to justify the damage patterns. Abstract: In the last decades GRC has been used in buildings and infrastructure, although there is insufficient data available related with its fracture energy. In order to expand knowledge in the field, the fracture energy in perpendicular and parallel directions with respect to the fibres is obtained. Three types of GRC with different formulations are tested. The results show that the fracture energy of a GRC with a 25% addition of a pozzolanic admixture is 40% and 8% higher than a standard GRC in, respectively, each orientation. Similarly, an addition of 25% of heat-treated kaolin to a standard GRC increases its fracture energy up to 490% and 400% depending on the given orientation. Moreover, the applicability of digital image correlation (DIC) to GRC fracture tests is shown. The use of DIC enables a description of the damaging patterns and explanation of the behaviours identified in the fracture tests performed.

Fibre Reinforced Cement And Concretes

Author: R.N. Swamy
Publisher: CRC Press
ISBN: 9781851664153
Size: 29.31 MB
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This volume consists of papers presented at the International Conference on Recent Developments in Fibre Reinforced Cements and Concretes, held at the School of Engineering, University of Wales College of Cardiff, UK, 18-20 September 1989.