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

By Geoffrey E. Blight, Mark G Alexander

Since AAR was once first pointed out in 1940, it's been an issue ruled through stories 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 power destiny swelling. Civil and structural engineers have came upon the literature bewildering and hard to use to their speedy necessities of assessing the current and destiny results of AAR at the energy, safeguard and serviceability of simple and strengthened concrete buildings.
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 protection of bolstered concrete constructions. tools of fix and rehabilitation and their long term luck are mentioned, as are tools of halting or slowing the development 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 uncomplicated knowing of the AAR procedure and its results on concrete.

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

Considering that AAR was once first pointed out in 1940, it's been a subject matter ruled through stories of the mineralogy of AAR-susceptible aggregates, the chemistry of the AAR and comparable reactions and laboratory exams used to diagnose AAR and expect capability destiny swelling. Civil and structural engineers have chanced on the literature bewildering and hard to use to their fast standards of assessing the current and destiny results of AAR at the energy, defense and serviceability of simple and bolstered concrete buildings.

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

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G. ASTM C1260) are very commonly used worldwide, having gained international acceptance. The method involves monitoring expansion of mortar bars or prisms containing the test aggregate and immersed in a 1M sodium hydroxide solution at 80°C. 3 Aggregate assessment for AAR (excluding carbonate rock assessment). Test designation and purpose 1 Material tested Procedure and duration Assessment criteria and test outcomes Test standards Limitations and remarks INITIAL SCREENING TESTS (Non- or Semi-Quantitative) Petrographic Examination.

Use of the test therefore requires careful pre-planning. Particular mention should be made of long-term structural monitoring of AARaffected structures. These represent the ultimate in performance tests and are dealt with in detail in Chapter 4. 4 RILEM technical committee contributions RILEM (Reunion Internationale des Laboratoires et Experts des Materiaux), through its various technical committees, has made significant contributions to the understanding of and testing for AAR. 2 (Nixon and Sims, 1996, Sims and Nixon, 2001, Sims and Nixon, 2003).

INFORMATION OBTAINED Desk Study of existing records & information Background information about structure, such as soil profiles, foundation type, as-built drawings and construction records, history of damage. Field inspection of structure Appearance and location of damage, type of damages and possible threat to safety. Preliminary opinion of cause(s) of damage. Decision on future procedures. Evaluation of field inspections results Decision whether laboratory and/or in-situ testing and/or monitoring measurements are required and what tests and measurements should be performed.

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