Inorganic

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

By Geoffrey E. Blight, Mark G Alexander

Since AAR was once first pointed out in 1940, it's been an issue ruled through reports of the mineralogy of AAR-susceptible aggregates, the chemistry of the AAR and comparable reactions and laboratory checks used to diagnose AAR and are expecting strength destiny swelling. Civil and structural engineers have stumbled on the literature bewildering and tough to use to their instant requisites of assessing the current and destiny results of AAR at the energy, defense and serviceability of simple and strengthened concrete constructions.
The publication 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 strengthened concrete constructions. tools of fix and rehabilitation and their long term good fortune are mentioned, as are equipment of halting or slowing the growth of AAR. while, the basics of AAR are defined in phrases intelligible to the civil and structural engineer who's essentially expert in structural mechanics and layout, but additionally must have a simple figuring out of the AAR technique 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

Example text

Conf. , pp. 411–417. Hobbs, DW 1987, ‘Some tests on fourteen years old concretes affected by the alkali-aggregate reaction’, 7th Int. Conf. on AAR in Concrete, Ottawa, Canada, pp. 342–346. Hooton, RD & Rogers, CA 1992, ‘Development of the NBRI rapid mortar bar test leading to its use in North America’, 9th Int. Conf. on AAR in Concrete, London, pp. 461–467. Jones, FE & Tarleton, RD 1958, Reactions between aggregates and cements, Parts V and VI, Alkali-Aggregate Reaction, National Building Studies, no.

Attack by AAR could be grouped with chemical causes. Finally, the loading for which the structure was designed may have been inadequate, or the structural detailing may have been incorrect, or knowledge of the properties of the structural materials could have been lacking. Unfortunately, these three causes occur the most often, and appear to have led to more disastrous structural collapses than any other cause. , 1995) showed that of the 40 failures that occurred in the 20th century, described in the book, 30 were the result of under-estimation of loading, lack of knowledge of material capabilities or incorrect structural detailing.

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. Potassium and sodium feldspars occur typically in igneous rocks such as granites and rhyolites; calcium feldspars occur in igneous rocks of lower silica content such as andesite, basalt and gabbro.

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