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Effectiveness of the accelerated mortar bar test to detect rapid reactive aggregates (including their pessimum content) and slowly reactive aggregates
The accelerated mortar bar test (AMBT) is one of the most common tests to detect reactive aggregates although it has some limitations: there is no agreement on the limit of expansion, fails appear when testing slowly reactive aggregates and a laborious work is needed to find the pessimum content. An experimental programme on the AMBT has been carried out to overcome these limitations. Rapid and slowly reactive aggregates extracted from real Spanish structures affected by alkali silica reaction have been used. As a result, the test detected correctly all the reactive aggregates, but with the following requirements: a limit of 0.10% at 14 days for rapid reactive aggregates and 0.20% at 90 days for slowly reactive aggregates. Also the pessimum content has been found between 5 and 15 vol% of equivalent reactive quartz, giving a peak expansion of 0.42% (14 days). The expansion after this peak decreased but it was always over 0.10%.
Effectiveness of the accelerated mortar bar test to detect rapid reactive aggregates (including their pessimum content) and slowly reactive aggregates
The accelerated mortar bar test (AMBT) is one of the most common tests to detect reactive aggregates although it has some limitations: there is no agreement on the limit of expansion, fails appear when testing slowly reactive aggregates and a laborious work is needed to find the pessimum content. An experimental programme on the AMBT has been carried out to overcome these limitations. Rapid and slowly reactive aggregates extracted from real Spanish structures affected by alkali silica reaction have been used. As a result, the test detected correctly all the reactive aggregates, but with the following requirements: a limit of 0.10% at 14 days for rapid reactive aggregates and 0.20% at 90 days for slowly reactive aggregates. Also the pessimum content has been found between 5 and 15 vol% of equivalent reactive quartz, giving a peak expansion of 0.42% (14 days). The expansion after this peak decreased but it was always over 0.10%.
Effectiveness of the accelerated mortar bar test to detect rapid reactive aggregates (including their pessimum content) and slowly reactive aggregates
Alaejos, P. (author) / Lanza, V. (author) / Bermudez, M.A. (author) / Velasco, A. (author)
Cement and Concrete Research ; 58 ; 13-19
2014
7 Seiten, 43 Quellen
Article (Journal)
English
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