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Mr. P. S. A. Berridge (Assistant Engineer (Bridges), Western Region, British Railways) first said how much he appreciated being allowed to join in the discussion. It was a privilege for which he was most grateful.
With reference to the article, ‘The elastic analysis of simple rectangular grids by virtual work methods’ by J. B. Martin, BSc, PhD, appearing in The Structural Engineer in June 1963, I would like to point out that a numerical error has been committed in the solution for the numerical example given in the article.
A review of existing literature on epoxy concrete (in which glue is used in place of cement) and on the use of epoxy and polyester resins for joints in concrete shows that joints stronger than the concrete can be made but that poor surface preparation leads to a serious loss of strength. There is little information on the creep of joints under shear stress.
R. PAUL JOHNSON