01737649

Component

https://doi.org/10.1177/0361198120913288

The most common test methods used to evaluate alkali-silica reaction (ASR) are the concrete prism test (CPT) and the accelerated mortar bar test (AMBT). However, these tests were not found to be entirely reliable in predicting the performance of concrete under field conditions, especially when supplementary cementitious materials (SCMs) are used. Recently, two new test methods, the miniature concrete prism test (MCPT) and the concrete cylinder test (CCT), have been proposed but still need to be benchmarked with results from outdoor exposed blocks. In this paper, the results from the MCPT, CCT, CPT and exposed blocks are compared and their ability to properly evaluate the expected behavior of these mixtures in service with regard to ASR is discussed. Here, the results of mixtures made with four reactive aggregates: Spratt, Placitas (coarse aggregates), Wright, and Jobe (fine aggregates) and SCMs (fly ashes Classes F or C, slag cement, or silica fume) at different levels of cement replacement or lithium nitrate are presented. For these mixtures, only the MCPT was capable of properly classifying the efficiency of the ASR preventive measures, as compared with the long-term results obtained from the exposed blocks.

© 2020 National Academy of Sciences: Transportation Research Board.

English

pp 120-134

2020-5

Transportation Research Record: Journal of the Transportation Research Board

Web

References (28)

Admixtures; Alkali silica reactions; Concrete blocks; Field tests; Laboratory tests; Reactive aggregates

Highways; Materials; Pavements

TRIS, TRB, ATRI

Apr 17 2020 3:04PM