This method enables to detect the potential of the deleterious alkali-silica reaction in mortar bars within 16 days.
The long-term test method included in the ASTM C 1293  covers the determination of the aggregate capacity for the alkali-silica reaction which causes concrete expansion.
The tests of mortar and concrete microstructures after the alkali-silica reaction have been conducted by means of scanning microscopy combined with X-ray analysis within the microsurface.
Similarly, the expansion of mortar bars with quartzite sandstone, measured in compliance with the ASTM C 1293, clearly suggests the occurrence of the alkali-silica reaction in concrete (Fig 4).
This conclusion finds confirmation in the occurrence of the alkali-silica reaction in concrete structures after a long period of use .
In case of slow reactive alkali aggregates, even after 180 days, no expansion exceeding 0,1% is observed, and thus suggesting that the aggregate is alkali reactive, since in this case the alkali-silica reaction occurs very slowly, and its consequences can only become noticeable after several years .
When they are completed, the Consensus Framework document and reports from the alkali-silica reaction
(ASR), cold in-place recycling (CIR), and accelerated aging projects will be available in hardcopy from FHWA and in electronic format (PDF) at the Recycled Materials Resource Center (RMRC) Web site (www.