Ninety-three rock samples were collected from the Carboniferous Limestone in the Clifton Gorge, Burrington Combe, Brean Down and temporary faces in Wick and Chipping Sodbury quarries. The samples were cut and peels taken to allow a petrographic description. The samples were tested for their unconfined compressive strength. Wet chemistry and X-ray diffraction were used to establish the rock mass chemistry and the nature of the insoluble residue. Attention is drawn to potentially alkali reactive constituents and the need to ensure that due consideration is given to the nature of the aggregate used in concrete manufacture.

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