Methods of non-destructive testing of concrete Part 2 Rebound hammer _2 .pdf. Copyright: Download as PDF, TXT or read online from Scribd. Flag for. Rebound Hammer (IS (Part 2): ). ▻ The rebound hammer method could be used for: i) Assessing the likely compressive strength of concrete. IS (Part 1): Indian Standard. NON-DESTRUCTIVE TESTING OF CONCRETE —. METHODS OF TEST. PART 1 ULTRASONIC PULSE VELOCITY.
|Language:||English, Spanish, French|
|ePub File Size:||19.59 MB|
|PDF File Size:||11.11 MB|
|Distribution:||Free* [*Regsitration Required]|
Bhartṛhari—Nītiśatakam. “Knowledge is such a treasure which cannot be stolen” . IS (): Method of non-destructive testing of concret-methods of. “Knowledge is such a treasure which cannot be stolen”. IS (): Method of Non-destructive testing of concret, Part 1: Ultrasonic pulse velocity [ CED 2. IS Part 1 - Download as PDF File .pdf), Text File .txt) or read online. is
Anonymous 7fA7B1fIDu. Rocking Khan. Research Laboratories. Divyesh Patel. New Delhi Telephones: There are occasions when the various perfortiance characteristics of concrete in a structure are required to be assessed.
A wet surface will give rise to underestimation of the strength of concrete calibrated under dry conditions. Only the vertical faces of the cube as cast should be tested.
Rough surfaces resulting from incomplete compaction. If the specimens are wet cured. The test specimens should be as large a mass as possible in order to minimise the size effect on the test result of a full scale structure. OF RESULTS rebound hammer method provides a convenient and rapid indication of the compressive strength of concrete by means of establishing a suitable correlation between the rebound index and the compressive strength of concrete.
As such. In general. I number is very surface on the rebound significant.
Carbonated concrete gives an overestimate of strength which in extreme cases can be up to 50 percent. It is possible to establish correction factors by removing the carbonated layer and testing the concrete with the rebound hammer on the uncarbonated concrete. If the concrete in a particular member has internal microcracking. If the relationship between rebound index and compressive strength can be checked by tests on core samples obtained from the structure or standard specimens made with the same concrete materials and mix proportion.
IS The procedure of obtaining such correlation is given in 5. In personal capacity Univardy of Roorkw. New Delhi Geological Corporation of Ltd. Central Building Research Rese. New Delhi Continued on page 5 f 4. Roorkee Ministry of Railways. Ghaziabad Bombay. Engineering Research Laboratories. Bombay of India. Calcutta Limited. Roorkee B. Bombay National Test House. Hyderabad Industries Limited. Pune Orissa Cement Limited. New Delhi General of Supplies and Disposals.
Bombay Central Public Works Departmeot. Calcutta and Power. Army Headquarters. Hospital Services Consultancy Ministry of Transport. Rustom Baug. Lucknow Engineers Indian India Limited. New Delhi Public Works Department. Calcutta India Works Rcpr6srnfing Limited.
New Delhi Institute of Technology. Bombay India Limited. CED 2: Foundation Organization. Bombay Government of Tamilnadu Part 2: Wardha Road. Bombay Services. Ministry of Railways. New Delhi.
Nagpur Research Designs and Standards Organization. New Delhi Limited. Bombay Research Institute. Research and Bombay Building Materials. Madras Central Public Works Department. Victoria Road. Ghaziabad A.
Bombay Materials. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. Continued from second cover situations. If the nominal grades of concrete or mix proportions are known to be different in either case.
The composition at Annex A. Manak Bhavan. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. SC0 IV Cross Road.
E9 MIDC. This does not preclude the free use. Enquiries relating to copyright be addressed to the Director Publications. New Delhi Telephones: Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. This Indian Standard has been developed from Dot: Printed at Printograph. Standards are also reviewed periodically. Scheme VII M. Copyright BIS has the copyright of all its publications.
Flag for inappropriate content. Related titles. Jump to Page. Search inside document. Ramarraju Kalidindi. If both the forms of timing apparatus are available.
This is to ensure a sharp pulse onset. The pulse velocity V is given by: It shall be capable of measuring the time interval elapsing between the onset of a pulse generated at the transmitting transducer and the onset of its arrival at the receiving transducer. A minimum path length of mm is recommended for the direct transmission method involving one unmoulded surface and a minimum of mm for the surface probing method along an unmoulded surface.
After traversing a known path length Q in the concrete. TWO forms of the electronic timing apparatus are possible. The indirect velocity is invariably lower than the direct velocity on the same concrete element. Surface probing is not so e5cient as cross probing. Each junction point of the grid becomes a point of observation. The pulse velocity of saturated concrete may be up to 2 percent higher than that of similar dry concrete.
For most concrete surfaces. Shape and Size of the Concrete Member As concrete is inherently heterogeneous. When the concrete surface is rough and uneven.
In general. The apparent increase in pulse velocity depends upon the proximity of the measurements to the reinforcing bar. Below freezing temperature.
IS Part 1: This in turn. When concrete is subjected to a stress which is abnormally high for the quality of the concrete. If one of the faces is not. This influence is likely to be the greatest when the pulse path is normal to the predominent direction of the planes of such micro-cracks. Transducers are held on corresponding points of observation on opposite faces of a structural element to measure the ultrasonic pulse velocity by direct transmission.
In field work. This is because. The shape and size of the concrete member do not influence the pulse velocity unless the least lateral dimension is less than a certain minimum value. Table 1 gives the guidance on the choice of the transducer natural frequency for different path lengths and minimum transverse dimensions of the concrete members. This occurs when the pulse path is perpendicular to the direction of a uniaxial compressive stress in a member.
This influence is more for low strength concrete than high strength concrete.
This influence is generally insignificant unless the stress is greater than about 60 percent of the ultimate strength of the concrete. The correlation so obtained may not be applicable for concrete of another grade or made with different types of materials.
The estimated strength may vary from the actual strength by f 20 percent. From these measurements. The reason is that a large number of parameters are involved.
Designs and Railways. New Delhi Ministry of Survey of India. Is Part 1: Bombay Nigam Ltd. Research Institute Research. Roorkce Chairman DR H. Research Laboratories. Madras CSIR. SHRI A. SHRI B. New Delhi Industries Limited. Transport Geological Central Department of Surface.
Bombay Associated Consulting Services. New Delhi DR M. BIS Concrete Subcommittee. Bombay 1 Gammon India Limited. Calcutta Director General.
CED 2: SHRI J. EH Alternate DlRl! Wardha Road. Army Headquarters Hindustan Prefab Ltd. Calcutta National Buildings Organization. Madras Gammon India Limited. Rangarajan Alternate DR P. Bombay In personal capacity 36 finch Nagar. Engineering Research Laboratories. Bombay Smu S.
Is Pad 1: Bombay Cement Corporation of India. New Delhi Smu Y. Nagpur 15 6. New Delhi Road. Rustom Barcg. Ministry Engineers India Limited. New Delhi Public Works Department. SHRI S. SHRI N. Bombay Ministry of Transport Roads Wing. Army Headquarters.
Lucknow SHm K. Bombay Central Road Research Institute. The composition of the technical given in Annex A. The test results on ultrasonic pulse velocity and rebound indices -are analysed statistically and plotted as histograms and the lower fractiles of results are taken for assessing the.
The number of-significant places retained in the rounded off value should be the same as that of the specified value in this standard. If the nominal grades of concrete or mix proportions are known to be different in either case. Continued from second Cover In-most of the situations. In doing so. Standards are also reviewed periodically. Sector A. New Delhi-l Enquiries relating to copyright be addressed to the Director Publications.
Manaksanstha Common to all offices Telephone Regional Offices: Manak Bhavan. This Indian Standard has been developed from Dot: Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. Scheme VII M.