IS 13311 PART 2 1992 EPUB

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IS : Method of non-destructive testing of concret-methods of test, Part 2: Rebound hammer [CED 2: Cement and Concrete]. “!ान $ एक न' भारत. In they published IS: (Part 2) for this test. IS: specified the Non-destructive tests are used to obtain estimation of the properties of concrete. Is (Part 2): Indian Standard NON-DESTRUCTIVE TESTING OF CONCRETE-METHODSOFTEST PART 2 REBOUND HAMMER 1 SCOPE This.

IS 13311 PART 2 1992 EPUB

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IS 13311 PART 2 1992 EPUB

The quality of entire concrete of a structure cannot be fully assessed by testing a few concrete cubes.

Non-destructive Testing Of Concrete By Rebound Hammer

The results obtained in testing cubes do not always reflect the actual strength of concrete in construction. In a whole day, concreting work cubes are cast in a few batches, the differences unintentional and intentional in the composition are not is 13311 part 2 1992, their compaction and their hardening conditions always differ more or less from those of the structure.

In addition, the number of test cubes is generally so small that they can only be considered as random tests. Some times, in case of failure of cubes, doubtful concrete, cracks, deterioration of concrete, etc.

As far back as early thirties, the necessity was felt to develop instruments by which in-situ strength of concrete may be obtained. In all these methods of tests, due to simplicity, rebound hammer test based on surface hardness becomes most popular in the world for non-destructive testing of in-situ concrete.

Ina Swiss Engineer, Ernst Schmidt developed a test hammer for measuring the hardness of concrete by the rebound principle. is 13311 part 2 1992

IS 13311-2: Method of non-destructive testing of concret-methods of test, Part 2: Rebound hammer

Inspite of its popularity, this testing has not been standardized in any country till except in Bulgaria. Advertisements Bureau of Indian Standard did not published any standard for this test upto In they published IS: CPWD specifications 77 vo.

Revised CPWD specifications page specified that for the purpose of payment Rebound Hammer hammering test is 13311 part 2 1992 only shall be the criteria.

IS 13311 PART 2 1992 EPUB

Neville, in the book Properties of Concrete Is 13311 part 2 1992 Edition on pagethe rebound hammer is useful in the assessment of uniformity of concrete with in a structure. The test can also be used to establish whether the rebound number has reached a value known to correspond to the desired strength.

This is of the help in deciding when to remove false work or to put the structure is 13311 part 2 1992 service. IRC Special Report — 17 on page 5 specified that rebound hammer test when properly calibrated on site with cubes, can be useful for measuring in structure magnitude and variability of strength.

It is most commonly used due to its simplicity and low cost.

Non-destructive Testing Of Concrete By Rebound Hammer

The rebound hammer method can be used with greater confidence for differentiating between the questionable and acceptable parts of a structure or for relative comparison between two different structures. When the plunger is is 13311 part 2 1992 against, the surface of concrete, it retracts against the force of the spring.

When completely retracted the spring is automatically released. On the spring controlled mass rebound, it takes the rider with it along the guide scale. By pushing a button, the rider can be held in position to allow readings to be taken.

IS 13311 PART 2 1992 EPUB

This calibration chart can be used only when material and testing conditions are similar to those in effect when the calibration of the instrument was carried out. Each hammer varies considerably in performance and needs calibration is 13311 part 2 1992 use on concrete made with aggregates produced from a specific source.

A practical procedure for calibration of the hammer for use on a job in progress is outlined below: