Hi friends, you are welcomed in the world of Civil Allied Gyan. In this article I have explained about drying shrinkage test of concrete.

By the help of this blog you can easily test the drying shrinkage of concrete. So please continue to the end & keep your love and support on me.

  • IS: 1199 - 1959

Overview:- Determination of drying shrinkage of concrete.

APPARATUS REQUIRED FOR THE TEST:-

https://civilalliedgyan.blogspot.com/2020/04/test-for-drying-shrinkage-of-concrete.html
Length- comparator


PROCEDURE OF THE TEST:- 
  1. The drying shrinkage is the difference between the original wet measurement and dry measurement which is expressed as a percentage of dry length of the rectangular molded sample.
  2. Make the specimen mould (2 layer compaction) of size 7.5cm × 7.5cm × 15cm or 7.5cm × 7.5cm × 30cm and control curing 3 to 7 days.
  3. Remove the specimen from the mould and keep the mould in water at 25°C to 29 °C for 28 days after the concrete has been made or other time as may be specified remove from water and measure the length of the bar (L1).
  4. Now keeping the bar at temperature 49°C to 51°C and humidity 17 % RH for 44 hour and cooling 4 hour. This process repeated and constant length is attained, (L2). 

Calculation:-
The percentage in difference of final length to the initial length i.e. (LL2) is the drying shrinkage.

https://civilalliedgyan.blogspot.com/2020/04/test-for-drying-shrinkage-of-concrete.html

RESULT:-
Length of sample measured to an accuracy of 0.005 mm.