By R Anderson, R. Anderson, J D Dewar Consultancy, J.D. Dewar
This variation of this profitable handbook has been conscientiously revised all through to take account of modern adjustments and to include amendments required as a result of ebook of the revised BS 5328. This guide offers info on all points of the ready-mixed concrete undefined, from the elemental fabrics and their houses to the creation, qc and using ready-mixed concrete.
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Extra info for Manual of ready-mixed concrete
This list is, however, of limited value because the vast majority of sands contain silica in a range of forms. It will also be noted that two of the commonest coarse aggregates, flint (or chert) and quartzite, are not included in the list. Fortunately, it is now becoming accepted that where the total aggregate consists of 60% or more flint or chert, it can be treated as unreactive. Generally, the few cases of serious damage which have occurred have been restricted to the Midlands and the SW of England.
This process, termed hydration, results in an interwoven physically bonded material structure, the components and porosity of which are dependent upon the types and activities of the Cementitious materials, the amount of water (originally present), the internal moisture and temperature history and the age of the concrete. Some of the components react relatively quickly, while others take many years to complete their reactions, and indeed may never be permitted to achieve anywhere near their full potential because of the absence of a suitable stable internal environment.
There is now a BS method, BS 812: Part 120, for testing and classifying drying shrinkage of aggregates in concrete. 07% can be obtained with some aggregates. 075% should be limited in their use generally to situations where complete drying out never occurs or for structural members that are symmetrically and heavily reinforced and not exposed to the weather. 16 Lightweight aggregates The commonest available types of lightweight aggregate for use in readymixed concrete are sintered pulverized fuel ash and expanded clay, but the following have also been used: expanded slate or shale, expanded or pelletized slag, natural pumice, exfoliated vermiculite, and expanded perlite.