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Dry Mortar silos on building site, Kenilworth

On the McCarthy & Stone site between Southbank Road and Abbey End.
My fellow contributor Richard Law, who works for Tarmac, tells me these silos contain a mix of sand and cement, premixed at the production plant to a specific recipe, and delivered to site to top up the silos as and when they run low, as building work proceeds. The advantages are that quality control lies with the producer, and that the brickies on site don't have to mix their own mortar, or have it delivered wet with the limited lifespan that wet mortar has. It's rapidly putting paid to the 'ready-mixed mortar' business in many places across the country.
Thanks to Richard for this information.