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

By Geoffrey E. Blight, Mark G Alexander

Since AAR used to be first pointed out in 1940, it's been a topic ruled via experiences 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 capability destiny swelling. Civil and structural engineers have chanced on the literature bewildering and tough to use to their instant requisites of assessing the current and destiny results of AAR at the power, protection and serviceability of undeniable and strengthened concrete constructions.
The publication discusses tools that may be used for laboratory harmful 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 protection of bolstered concrete buildings. tools of fix and rehabilitation and their long term luck 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 essentially proficient in structural mechanics and layout, but in addition must have a easy knowing of the AAR procedure and its results on concrete.

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

Example text

29, no. 190, pp. 323–334. Oberholster, RE 1983, ‘Alkali reactivity of siliceous rock aggregates: diagnosis of reactivity, using cement and aggregate and description of preventive measures’, 6th Int. Conf. on AAR in Concrete, Copenhagen, Denmark, pp. 419–433. Oberholster, RE 2001, ‘Alkali-silica reaction’, in Fulton’s concrete technology, eds. BJ Addis & G Owens, 8th edn, Cement and Concrete Institute, Midrand, South Africa. Oberholster, RE & Davies, G 1986, ‘An accelerated method for testing potential alkali reactivity of siliceous aggregates’, Cement and Concrete Research, vol.

Test shows some aggregates to be innocuous when they are known to have a poor service record. 3 (Continued). g. ) at Determination of the RILEM construction. after 52 weeks: potential AAR expansion 38°C. 10 per cent – standards. H. for a period of 3 months (91 days). 02 per cent – aggregates water at 60°C. 02 per cent after construction 20 weeks; longer 6 months indicates for some slowlyminimal risk of AAR reacting aggregates Shape of expansion curve to be considered also. Limitations and remarks Advantage that actual mixes can be tested in proportions specified.

However, these tests may not be particularly useful in predicting the rate and degree of damage that is likely to occur in a real structure made with such aggregates. 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.

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