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A platform for research: civil engineering, architecture and urbanism
Effectiveness of the accelerated mortar bar test to detect rapid reactive aggregates (including their pessimum content) and slowly reactive aggregates
Abstract 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 14days for rapid reactive aggregates and 0.20% at 90days for slowly reactive aggregates. Also the pessimum content has been found between 5 and 15vol% of equivalent reactive quartz, giving a peak expansion of 0.42% (14days). The expansion after this peak decreased but it was always over 0.10%.
Highlights An experimental programme on the Accelerated mortar bar test is carried out The AMBT limit of 0.10% at 14days detects rapid reactive aggregates The AMBT limit of 0.20% at 90days detects slowly reactive aggregates The pessimum content has been found between 5 and 15vol% of equivalent reactive quartz The expansion after the pessimum content decreases but it is always over 0.10%.
Effectiveness of the accelerated mortar bar test to detect rapid reactive aggregates (including their pessimum content) and slowly reactive aggregates
Abstract 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 14days for rapid reactive aggregates and 0.20% at 90days for slowly reactive aggregates. Also the pessimum content has been found between 5 and 15vol% of equivalent reactive quartz, giving a peak expansion of 0.42% (14days). The expansion after this peak decreased but it was always over 0.10%.
Highlights An experimental programme on the Accelerated mortar bar test is carried out The AMBT limit of 0.10% at 14days detects rapid reactive aggregates The AMBT limit of 0.20% at 90days detects slowly reactive aggregates The pessimum content has been found between 5 and 15vol% of equivalent reactive quartz The expansion after the pessimum content decreases but it is 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) / Bermúdez, M.A. (author) / Velasco, A. (author)
Cement and Concrete Research ; 58 ; 13-19
2014-01-06
7 pages
Article (Journal)
Electronic Resource
English
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