To assess the suitability of water for use in concrete mixes.


  • measuring cylinder
  • cube molds
  • karni
  • tamping rod
  • vibrating table
  • test machine


  1. Analyze according to the chemical composition of water: IS 3025-1964 and compare these with the given permissible limits IS: 456-2000,
  2. If the water does not meet the permissible limits or it is not possible to obtain chemical analysis data easily, the suitability of water is tested by making concrete cubes. Concrete of desired grade is prepared with available water in a designed ratio and with cubes cast for testing.
  3. Prepare equal concrete mix with distilled water and pour the cubes in exactly the same way as with water of unknown nature.
  4. Fix both samples in the respective water under exactly the same conditions.
  5. Test both the cube samples in exactly the same way after 7 and 28 days. Compare the test results for the surface strength and conditions of the cubes with respect to the mixture prepared from the available water and distilled water.
  6. Available water will be considered suitable if its strength is not very low and no degradation is observed in the case of concrete prepared with available water of unknown quality.


  1. To assess the suitability of water for mixing and curing a concrete cube, it must be prepared and tested under similar conditions with available water of unknown quality and distilled water.
  2. The mix ratio should be kept exactly the same in both the cases.
  3. All equipment must be clean.
  4. Cement, sand and coarse aggregate should be the same which is likely to be used on site.


Calculate the ratio of the average compressive strength of concrete prepared from unknown water and distilled water.

Er. Mukesh Kumar

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Er. Mukesh Kumar is Editor in Chief and Co-Funder at Civil Engineering Website. Mukesh Kumar is a Bachelor in Civil Engineering From MIT. He has work experience in Highway Construction, Bridge Construction, Railway Steel Girder work, Under box culvert construction, Retaining wall construction. He was a lecturer in a Engineering college for more than 6 years.