the average depth and breadth of the specimen shall

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Unformatted text preview: breadth of the specimen shall be determined to an accuracy of ± 0.2 mm, the average being taken in each case of at least six measurements spaced equally along the length of the specimen. 10.6 Calculation — The density of the wet concrete shall be calculated from the formula: 6 10 × W w = -------------------l×b×d 10.6.1 The dynamic modulus of elasticity shall then be calculated to the nearest 1 000 kg/sq cm from the formula: E = 4.083 × 10–9 n2l2w where E = dynamic modulus of elasticity in kg per sq cm, n = natural frequency of the fundamental mode of longitudinal vibration of the specimen, in cycles per second, w = density in kg per cu m, W = weight in kg of the specimen, l = length in cm of the specimen, b = breadth in cm of the specimen, and d = depth in cm of the specimen. 22 IS : 516 - 1959 10.7 Number of Specimens — At least three specimens shall be tested for each age of test. 10.8 Report — The following information shall be included in the report on each specimen: a) identification mark, b) date of test, c) age of specimen, d) curing conditions, e) average dimensions of specimen, f) weight of wet specimen, g) natural frequency of the fundamental mode of longitudinal vibration of specimen, and h) dynamic modulus of elasticity. 23 Bureau of Indian Standards BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country. Copyright BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director (Publications), BIS. Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Catalogue’ and ‘Standards : Monthly Additions’. This Indian Standard has been developed by Technical Committee : BDC 2 and amended by CED 2 Amend No. Amendments Issued Since Publication Date of Issue Amd. No. 1 Incorporated earlier Amd. No. 2 July 1991 BUREAU OF INDIAN STANDARDS Headquarters: Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002. Telephones: 323 01 31, 323 33 75, 323 94 02 Regional Offices: Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELHI 110002 Eastern : 1/14 C. I. T. Scheme VII M, V. I. P. Road, Kankurgachi KOLKATA 700054 Northern : SCO 335-336, Sector 34-A, CHANDIGARH 160022 Telegrams: Manaksanstha (Common to all offices) Telephone 323 76 17 323 38 41 337 84 99, 337 85 61 337 86 26, 337 91 20 60 38 43 60 20 25 235 02 16, 235 04 42 Southern : C. I. T. Campus, IV Cross Road, CHENNAI 600113 235 15 19, 235 23 15 832 92 95, 832 78 58 Western : Manakalaya, E9 MIDC, Marol, Andheri (East) MUMBAI 400093 832 78 91, 832 78 92 Branches : A H M E D A B A D . BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. LUCKNOW. NAGPUR. NALAGARH. PATNA. PUNE. RAJKOT. THIRUVANANTHAPURAM. VISHAKHAPATNAM....
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