Appraisal and Repair of Reinforced Concrete by R Holland

By R Holland

This ebook offers information on appraisal and service of bolstered concrete construction constructions. It addresses the issues on the topic of bolstered concrete, corrosion of reinforcement, cracking, cathodic safety and protecting coatings, and it highlights the benefits and/or difficulties of every whereas explaining the tools and techniques to be had

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4. Volume change related cracks Volume change in concrete occurs as a result of temperature variation or shrinkage of the concrete. It is a natural process starting minutes after the placing of the concrete and extending for years into the service life of the structure. When restrained, any volume change causes tensile strains often of sufficient magnitude to produce cracks. The types of restraint that can lead to cracking include embedded reinforcement and the forces caused by differential temperature gradient within the concrete mass.

Longman, London, 1991. Concrete Society. Non-structural cracks in concrete. The Society, London, 1982, Technical Report 22. I. Time effects inconcrete structures. Elsevier, Oxford, 1988. Holland R. et al. Appraisal and repair of building structures — Introductory Guide. Thomas Telford, London, 1992. Institution of Structural Engineers. Appraisal of existing structures. The Institution, London, 1996. Loss Prevention Council. Property subject to structural movement: guidelines on the assessment ofcracks.

It may be wise also to take samples of efflorescence for laboratory examination. 9. Surface deposits Additional data required regarding surface deposits is as follows. • Shape of each item of efflorescence, rust staining or dampness (in the form of a sketch or photograph) and a description of the colour of rust staining (dark brown could indicate a more serious situation than light brown) or efflorescence; the colour and smell of leakage or patches of dampness (mould growing on damp areas could be a threat to timber or public health and colour and smell might help to indicate the source or route of the liquid).

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