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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.
Mr. Peter Mason (Member of Council) said it had been mentioned in the paper that it looked as though the Roman engineering organization for large engineering projects was very similar to that of today. There had been bills of quantities, etc. and work had been carried out by contractors. He wished to know how the engineering had been done. Had it been done by military engineers or had there been trained civilian engineers?
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