What tests are conducted for rebar couplers?

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Rebar coupler testing and solutions are a significant and integral part of providing the best materials on varied construction sites in India. Keeping in touch with the codes and compliances to reduce bar congestion can improve the efficiency and quality of the project. It also gets completed on time.


Vruddhi Couplers is actively involved in providing the best coupler systems to its clients across India. We need to conduct all the tests to help in the high performance of our rebars. With various testing expertise, you can be assured that we will handle your next prestigious project with our key coupler products.


Conducting primary tests


  • Static Tensile Test (UTS, bar break, elongation)
  • Slip Test
  • Cyclic Tensile Test (100 cycles)
  • Low cycle fatigue test
  • Chemical Composition Test


On receipt of raw material for Vruddhi couplers, we conduct tensile test and chemical test of round bars. Once the results are satisfactory, the raw material is taken up for production of couplers. Chemical composition test result is provided with each coupler lot. At the start of each project, static tensile test and slip test for spliced sample is carried by us and witnessed by the client. This step ensures transparency and establishes quality of rebar couplers and workmanship of rebar threading. For an on-going project, static tensile test of spliced samples is conducted at a frequency predetermined between us and the client. Type tests like Cyclic Tensile Test, Low Cycle Fatigue test have a validity of three years. These type tests have been performed at the prestigious Indian Institute of Technology. These type tests are submitted to client as part of quality approval process.


Static Tensile Test (UTS, bar break, elongation) as per IS code 16172


All testing equipment are computer controlled with OEM and batches mentioned. The tensile strength of the mechanical splice, when tested by following the details: not less than 600 N/mm2. It should correspond to the minimum tensile strength of the reinforcement bar of Fe 550D grade specified in IS 1786.


The minimum percentage elongation at maximum force (is also called uniform elongation). It should measure as per the method given. The reinforcing bar outside the length of the mechanical splice shall be a minimum 3 percent before the failure of the test piece.


Slip Test


The total slip value measured by the test procedure should not exceed 0.10 mm.


Cyclic Tensile Test

The mechanical splice is reliable when it can withstand 100 cycles of stress variation. The cycle is from 5 percent to 90 percent of fy (where fy = 550 N/mm2) when tested by standard details. It is to be done without loss of static tensile strength capacity when compared with a similar specimen. The static tensile strength capacity of the sample is determined by testing it statically. It undergoes numerous stress cycles for failure of the required procedure. At the end of the test, the spliced sample shall remain intact.


Low cycle fatigue test


There are two types of fatigue tests namely low cycle fatigue test and high cycle fatigue test. All reinforcement couplers should be able to satisfy the requirement for low cycle fatigue tests. The mechanical splice should withstand 10 000 cycles of alternating tension and compression load when tested by a standard method.



Manufacturing stage requirements


The products need to have internal strength, adequate length, and equal strength. The manufacturing design should meet the performance and test for all standards required. It should also adhere to and match IS code 16172 perquisites.


We at Vruddhi Couplers perform the testing as per the guidelines and codes required. Each coupler is indelibly marked for unique identification and the purpose it is intended for.


We look forward to your request for specific rebars and help you meet your project goals.



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