Abstract

The CIRIA Project Report 11 ‘Foundations in Chalk’ introduced a new chalk classification scheme. For structured chalk the grade isdefined by a combination of fracture spacing and aperture, supplemented by an assessment ofdensity. For structureless chalk the grade is based on the proportion of comminuted chalk matrix to coarser fragments. This technical note describes how the CIRIA scheme should be integrated with a full description of the Chalk, and suggests some modifications and clarifications to the scheme to overcome practical difficulties in its usage.

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