Concrete specialist Understanding Cement has unveiled a new video showcasing details of reacting aggregate and X-ray microanalysis of aggregate, gel and cement paste.

The 18-minute long video is the first in a two-part series examining Alkali-silica Reaction in Concrete, as seen in the Scanning Electron Microscope.

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Understanding Cement said: "In this first video we look at polished sections in the SEM of concrete from a bridge that was demolished due to alkali-silica reaction (ASR).

"The reactive aggregate in this video is chert, a rock type composed largely of microcrystalline silica."

A second video on ASR will be available within the next few weeks.

To watch Part 1 of the series, visit here.