The Technology of Building Defects
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The Technology of Building Defects has been developed to provide a unique review of the subject. Defects are considered as part of the whole building rather than in isolation.
General educational objectives are set out which offer the reader the opportunity of self-assessment. Each section is generously illustrated with photographs and diagrams, forming an accessible self contained review covering the following: objectives; core information; exercises; revision notes; further reading.
Taken together these sections build up to offer the reader an understanding of a range of technical topics concerned with building defects.
This core text can be used for direct lecture material, seminar and tutorial information, assignment work and revision notes. It is a convenient one stop resource which dispenses with the need to consult a mass of different information sources.
This book is for: Ruth, Sally, Jasmine and Jack Rosie, Ruth and Rebecca for all their support and understanding. The Technology of Building Defects John Hinks Geoff Cook First published 1994 by E & FN Spon Spon Press is an imprint of the Taylor & Francis Group This edition published in the Taylor & Francis e-Library, 2003. © 1997 John Hinks and Geoff Cook All rights reserved. No part of this book may be reprinted or reproduced or utilized in any form or by any electronic, mechanical, or
issues associated with the safe disposal of asbestos. Asbestos Asbestos cement is made from the mineral chrysotile, mixed with cement and water. The amount depends on the use of the material, the greater density then the greater the cement content. Asbestos cement roofing sheets contain around 10% asbestos fibres. Roofing sheets can last up to 40 years. Asbestos fibres can be classified as follows. Chrysotile This is commonly called white asbestos. This was the most commonly used mineral in
in dimension tangentially, 6% radially and 0.1% longitudinally. These changes can cause distortion of the timber, which may set up internal stresses which the timber cannot resist and the material may split, check or shake. These changes can have detrimental effects, for example increases in the moisture content of timber floor coverings may cause the blocks to become detached from the subbase. Floor blocks laid with a high moisture content may shrink when the building is in use. Timber which is
Hence steel piles, with minimal oxygen levels in the subsoil surroundings, corrode very slowly regardless of the nature of the soil. Obviously, the corrosion rate will be different above ground and at the interface. The corrosion of reinforcement steel operates through an electro chemical process determined in part by the presence of differential oxygen levels within the reinforced concrete. Different regions act as cathodes or anodes according to whether oxygen is present or not. The occurrence
detachment of the render is most marked where the gable parapet is exposed at the eaves. 128 Defects in components: general mechanisms may fall off the render coat owing to the undercoat having a high suction. The tensile forces of dashing attachment can be significant, and weak backgrounds may not be suitable. Loss of strength, powdering of the surface and general failure of the render may be due to the application of ready-mixed mortar beyond the recommended retardation period. Appearance