Essay on Alkali Aggregate Reaction
Structures most at risk are bridges, hydraulic structures, exposed frames [e.g. open multistorey car parks] and foundations. In relation to total construction volume, the incidence of …show more content…
Further work is going on to investigate the use of silica fume, metakaolin and lithium salts to achieve the same objective. Research has indicated that air entrainment is not significantly beneficial in inhibiting the problem. This work is being supervised by a BRE Working Party and an Information Paper, IP 1/02 Minimising the risk of alkali-silica reaction: alternative methods, has now been published.
If ASR is suspected, then an investigation should follow. The extent of this investigation should be related to the criticality of the structure and the perceived intensity of the reaction. Full details of a diagnosis programme can be found in BCA report The diagnosis of alkali-silica reaction.
In essence this report recommends the following:
· A desk study to ascertain the source and analyses of materials used.
· Critical examination of site to determine if causes other than ASR are present