Author: Rawlings, B
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The Institution welcomes as its President for the Session 1966-67 Dr. D.D. Matthews, who takes office on 6 October. Denis Dearman Matthews was born in 1912. His grandfather, Henry Matthews, President of the National Federation of Building Trades Employers 1924, was a leading Manchester builder and founder of the firm of H. Matthews & Sons, of which the President’s present firm of Matthews & Mumby was originally a subsidiary. His father, Walter Matthews, who in 1938 was a Vice-President of the then Institute of. Builders, succeeded as head of the firm and besides being prominent in the industrial field was a strong supporter of technical education and training.
Mr. C. B. Stone (Vice-president) said it was a common failing of consultants not to admit that their Structures leaked; however, he himself did not know of any case of leakage due to shutter ties. Mr. Jackson had shown there was a weakness but Mr. Stone thought that, if there had been a low water/cement ratio and thorough compaction by vibration, the cavity would not have formed.
The paper describes tests on twenty-seven Lytag concrete columns. Sixteen of the columns were reinforced with varying percentages of square twisted steel and the remaining eleven were unreinforced. It was found that, although the ultimate loads of reinforced Lytag concrete columns are slightly less than those of equivalent gravel concrete columns, the load factors are satisfactory. It is therefore safe to design reinforced Lytag concrete columns with the permissible stresses specified in CP l14 (1957). C.O. Orangun