By Geoffrey E. Blight, Mark G Alexander
Since AAR was once first pointed out in 1940, it's been a subject matter ruled by means of reports of the mineralogy of AAR-susceptible aggregates, the chemistry of the AAR and similar 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 instant necessities of assessing the current and destiny results of AAR at the power, security and serviceability of simple and strengthened concrete constructions.
The publication discusses equipment that may be used for laboratory damaging and in situ non-destructive trying out to evaluate the consequences of AAR, and in-service measurements and load-testing to evaluate the current and destiny security of bolstered concrete buildings. tools of fix and rehabilitation and their long term luck 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 basically knowledgeable in structural mechanics and layout, but in addition must have a simple knowing of the AAR approach and its results on concrete.
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Extra resources for Alkali-Aggregate Reaction and Structural Damage to Concrete: Engineering Assessment, Repair and Management
Indb 43 12/16/2010 3:47:43 PM 44 Alkali-aggregate reaction and structural damage to concrete Larbi, J, Modry, S, Katayama, T, Blight, G & Ballim, Y 2004, ‘Guide to diagnosis and appraisal of AAR damage in concrete structures: The RILEM TC 191-ARP approach’, 12th Int. Conf. on AAR in Concrete, Beijing, China, pp. 921–932. Mielenz, RC 1994, ‘Petrographic evaluation of concrete aggregates’, in Significance of tests and properties of concrete and concrete making materials, ASTM STP 169C: pp. A. Nixon, P & Sims, I 1996, ‘Testing aggregates for alkali-reactivity’, Materials and Structures, vol.
The issue is complicated by differing national standards and test methods in which criteria and approaches may differ. 3 gives a summary of aggregate tests for AAR. The tests are considered in three main categories: • • • initial non-quantitative screening tests (used to make a provisional assessment), indicator tests to differentiate between potentially reactive and innocuous aggregates, and performance tests, giving information on limiting alkali contents to avoid damaging expansions. These three divisions follow a natural progression in many cases of diagnosis for AAR: initial indications on the likelihood of susceptible aggregates being present; more detailed tests to assess whether the aggregate is indeed alkali-susceptible; and tests that provide information on likely performance of a given concrete mix or set of concrete materials for a specific application.
A north-point. 2 Observations on the structure The site inspection of the affected structure should be designed for the type of structure concerned. A site investigation of a dam, for example, may be different from that of a bridge or a building structure, because of differing usage and structural aspects. The environmental conditions to which the structure is exposed should be clearly described. 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.