IS 6923 -1973 Code Book PDF free download
This Indian Standard was adopted by the Indian Standards Institution on 22 March 1973, after the draft finalized by the Construction Plant and Machinery Sectional Committee had been approved by the Civil Engineering Division Council. The vibration characteristics for screed board concrete vibrators are indicated in IS : 2506-1964* which also recommends the methods for measuring these characteristics. While specifying these vibration characteristics, the committee had appreciated that even the requirements in regard to amplitude, frequency and acceleration could considerably vary from case to case and,therefore, the attempt in the specification had been to lay down only the limiting values of the vibration characteristics and the physical dimensions of vibrators on the basis of available technical literature, experience and the manufacturing practices in the country. A mere measurement of amplitude, frequency and acceleration of vibration may not yield a firm basis for judging the efficiency of a screed board vibrator and? therefore, a direct measurement of the,amount and uniformity of compaction of concrete achieved with a vibrator would alone give a more convincing and fairer appreciation of its quality. In this standard an attempt has been made to arrive at a method of test for direct measurement of compacting characteristics of screed board concrete vibrators to assess their performance in terms of compaction of concrete. The requirements have been suggested on the basis of available literature and will be reviewed further with the availability of more data in the light of experience gained with the use of this standard. In reporting the result of a test or analysis made in accordance with this standard, if the final value, observed or calculated, is to be rounded off, it shall be done in accordance with IS : 2-1960 t.
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