Book Reviews
All publications described below are available from the Cement and Concrete Association, 52 Grosvenor Gardens, London, S.W.1.
Testing to destruction of full-size portal frames, by J. B. Read. Ref. No: TRA 390. Price 10s.
This report discusses the results of tests on eight full scale reinforced single-storey portal frames. The main points investigated were the behaviour of the frames when the support conditions at the feet of each portal were varied and the structural behaviour of concrete when either sand or cement was partially replaced by pulverized fuel ash (flyash.)
Comparisons made between the results obtained from the tests and a computer analysis developed for reinforced concrete frames are con- tained in this publication. It was concluded that the frames construct- ed with concrete using flyash be- haved, under test, in the same man- ner as a conventional concrete frame would have done.
Tests on reinforced concrete frames.
1: Pinned portal frames, by W.B. Cranston, B.Sc. Ph.D. Ref. No: TRA 392. Price 10s.
Tests carried out on eight pinned portal frames are described in this publication. A detailed description is given of the design, manufacture and testing of the frames and also
the results of calculations of maxi- mum moments, permissible hinge rotations and maximum loads, the maximum loads being calculated on the assumption that mechanisms would develop on collapse.
Comparisons are made between the experimental and calculated values. It is concluded that the as- sumption of mechanism behaviour of collapse is reasonable, provided the amount of tension steel is not excessive.
Introduction to statistical methods for quality control of concrete. Cement and Concrete Association Advisory Booklet No: 8. Ref. No: Cz. 8. Price Is.
There are many processes which are checked regularly by tests that give numerical results. These results always show some variation; statis- tical methods may be employed to help in assessing the results and keeping the variability in future work within specified limits.
These methods can be applied to the results of some control tests used in the concrete industry, such as those to determine the percentage of aggregate passing a particular sieve, and values of compacting factor and strength. This advisory booklet con- tains information on the measures of variability, distribution and graphical evaluations of results of tests carried out on concrete cubes.
The determination of the proportions of aggregates approximating to any required grading. Cement and Concrete Association Advisory Booklet No: 9. Ref. No: Cz. 9. Price 1s.
This booklet presents two methods by which aggregates available for a concreting operation may be so pro- portioned as to approximate any grading.
The first method is graphical and is applicable to two or more sizes of aggregates and is more suitable for use when the aggregates naturally form a grading similar to that re- quired.
The second method is arithmetical and is applicable to two sizes of ag- gregate, although it can be adapted for more.
The concrete cube test. Ref. No:
Cb.7. Price Is.
The method of assessing the quality of concrete that has been widely accepted for almost all concrete work is the testing of cubes in com- pression. This test, although it does not give a guide to all the desirable properties for hardened concrete. gives a general assessment of the quality required.
This booklet describes the various stages involved: the selection of sam- ples for testing: sampling: cube moulds: compacting: initial curing: demoulding: water curing: mould cleaning: testing cubes: and cubes cured under non-standard conditions.
grid switch range giving wide gang choice
MEM
1, 2, 3, 4, 6, 8, 9, 12 gang, Metalclad only. Flush or surface. Moulded up to 8 gang, flush only. Switch units all completely interchangeable in the standard grids and boxes. Only finger-tip pressure needed to attach switch unit rigidly to grid. Flush plates available in Ivory or Brown mouldings: also in Stainless Steel, B.M.A. or mat chrome. Surface patterns available in aluminium stove enamel or B.M.A.
Write for full details:
Agent:
INNISS AND RIDDLE (CHINA) LTD., P.O. Box 73 608/616 Prince's Building, 6th Floor, Hong Kong.
MIDLAND ELECTRIC MANUFACTURING CO. LTD.
Reddings Lane, Tyseley, Birmingham 11. England.
MEM
Far East Architect & Builder April, 1966
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