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
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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.
A comparative analysis given in table 5 is then made to know the effect of reinforcement. The observations and remarks have been given in tables 6 and 7. The assessment of compressive strength of concrete from ultrasonic pulse velocity values is not accurate because the correlation between ultrasonic pulse velocity and compressive strength of concrete is not very clear. Because there are large number of parameters involved which influence the pulse velocity and compressive strength of concrete to different extents.
However, if details of material and mix proportions adopted in the particular structure are available, then estimate of concrete strength can be made by establishing suitable correlation between the pulse velocity and the compressive strength of concrete specimens made with such material and mix proportions, under environmental conditions similar to that in the structure.
The correlation so obtained may not be applicable for concrete of another grade or made with different types of material. At some places in columns USPV gave no results or indicated that the velocity was out of range. This place gave a unique sound on striking softly with a hard material like iron which clearly indicated a void in between the concrete. A general trend was obtained in the columns. The trend was such that towards the base of the column the tests always showed a higher quality of concrete i.
The compressive strength went on decreasing as we go up towards the roof. A graph has been plotted with increasing height against the predicted compressive strength obtained on the basis of the USPV evaluation. It is evident from the graph that the compressive strength goes on decreasing with increase in height of column Figure 2.
The reason for this variation is better compaction at the base. Since all the weight of the column acts at the base higher compaction is achieved and also better compaction facilities are available near the base and process compaction becomes difficult as we go up. No such regular trend was observed for beams.
Conclusions The main conclusions drawn from investigation performed are as follow: 1. The poor quality concrete allows the ingress of moisture and oxygen to the reinforcing bars, and hence corrosion occurs.
Presently the system is limited to penetration depths of 1 ft. Research is ongoing to develop a system that can penetrate to a depth of 10 ft or more. The pulse velocity method is an ideal tool for establishing whether concrete is uniform.
It can be used on both existing structures and those under construction 3. Usually, if large differences in pulse velocity are found within a structure for no apparent reason, there is strong reason to presume that defective or deteriorated concrete is present. Fairly good correlation can be obtained between cube compressive strength and pulse velocity. Ultrasonic pulse velocity tests have a great potential for concrete control, particularly for establishing uniformity and detecting cracks or defects.
Its use for predicting strength is much more limited, owing to the large number of variables affecting the relation between strength and pulse velocity. The deviation between actual results and predicted results may be attributed to the fact that a sample from existing structures was obtained by using various corrections introduced in the specifications. The method presented is simple, quick, reliable, and covers wide ranges of concrete strengths..
The method can be easily applied to concrete specimens as well as existing concrete structures by taking direct measurements on concrete elements. The final results were compared with previous ones from literature and also with actual results obtained from samples collected from existing structures.
The correlation curves established in the study can be useful for the assessment of the quality of the concrete in an existing nearby structures made with the similar grade of the concrete and the similar sources of the DOI: Unlike other work, the research ended with important and useful charts that require no previous knowledge of the constituents of the tested concrete.
References . Tarun Gehlot, Dr. IS Part-1 - Shetty MS Concrete Technology. BS Guidelines on use of ultrasonic instruments for monitoring of concrete structures. Neville and J. Concrete Technology, Longman, UK Lin, C.
Lai and T. Carino N. Mehta, Ed.
Kaplan, M. ACI J. The American Society for Nondestructive Testing. BS Part , 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. E9 MIDC. New Delhi Telephones: 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.