Geoffrey E. Blight, Mark G Alexander's Alkali-Aggregate Reaction and Structural Damage to Concrete: PDF

By Geoffrey E. Blight, Mark G Alexander

ISBN-10: 0415613531

ISBN-13: 9780415613538

Since AAR was once first pointed out in 1940, it's been an issue ruled via stories of the mineralogy of AAR-susceptible aggregates, the chemistry of the AAR and comparable reactions and laboratory assessments used to diagnose AAR and are expecting strength destiny swelling. Civil and structural engineers have came upon the literature bewildering and tough to use to their speedy standards of assessing the current and destiny results of AAR at the energy, protection and serviceability of undeniable and bolstered concrete buildings.
The booklet discusses equipment that may be used for laboratory damaging and in situ non-destructive checking out to evaluate the consequences of AAR, and in-service measurements and load-testing to evaluate the current and destiny protection of bolstered concrete buildings. tools of fix and rehabilitation and their long term good fortune are mentioned, as are tools of halting or slowing the growth of AAR. whilst, the basics of AAR are defined in phrases intelligible to the civil and structural engineer who's basically expert in structural mechanics and layout, but additionally must have a easy realizing of the AAR method and its results on concrete.

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Additional info for Alkali-Aggregate Reaction and Structural Damage to Concrete: Engineering Assessment, Repair and Management

Sample text

Further, many tests are broad ‘categorisation tests’ which are intended to screen aggregate sources in terms of AAR susceptibility. Aggregates that ‘fail’ such tests could possibly still be used successfully in concrete structures provided the proper precautions are taken. Thus, any testing programme must be carefully constructed to provide the maximum amount of useful information to the engineer. indb 32 12/16/2010 3:47:42 PM Diagnostic investigations and tests and their interpretation 33 this will involve not only an assessment of the potential of an aggregate for AAR, but also an assessment of the conditions under which the aggregate might still be used.

In the case of a viaduct or a bridge in cold temperate climatic regions, clear distinctions should be made between the areas that are more exposed to de-icing salts and those that are not. Attention should also be given to situations where roof leakages, ponded water, groundwater, seawater or sea spray, de-icing salts, or condensation can occur. 3 Preliminary assessment of the site inspection As AAR is a relatively uncommon phenomenon, in most cases, the site inspection will not result in AAR being suspected as a cause of the cracking.

Frequently occurs with chert and is usually alkali-reactive. Tridymite and Cristobalite High temperature crystalline forms of silica associated with volcanic rocks, and alkali-reactive. Feldspars These alumino-silicate minerals are the most abundant rock forming minerals in the earth’s crust, and are important constituents of most major rock groups. Feldspar minerals are differentiated by chemical composition and crystallographic properties. Potassium Feldspars: orthoclase and microcline Sodium Feldspars: albite, plagioclase} Intermediate feldspars are oligoclase, andesine, Calcium Feldspars: anorthite} labradorite, and bytownite.

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Alkali-Aggregate Reaction and Structural Damage to Concrete: Engineering Assessment, Repair and Management by Geoffrey E. Blight, Mark G Alexander

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