Author: Faber, Oscar
First published: N/A
Standard: £9 + VAT
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It has been realised for a number of years that the present form of strength test included in the British Standard Specification for Portland cement has a very limited relation to the strength properties required from the cement in practice. Although the test is of value in so far as it may provide an assurance that the cement, when used with sound aggregates, will produce mortars and concretes of adequate strength for many purposes, it does not place the various marketed cements in an order of strength which can be related in any known way to the strength of products made from the cement.
To the EDITOR of The Structural Engineer. SIR,-A point which has been much stressed
recently (namely, that all local authorities who have control over buildingshould be empowered to permit the use of welding in steel structures, subject to specified codes of practice), has again been brought to the notice of engineers, in the discussion which followed Mr. Helsby's paper.
In most cases of compound beams and built-up girders it is customary, in order to obtain an economical design, to vary the moment of inertia of the section throughout the length of the beam by curtailing the flange plates in accordance with the reduction of the B.M. at the respective sections.