How to Ascertain the Drying Shrinkage of Hardened Concrete
Posted on May 24, 2019
Objective of Shrinkage of Hardened Concrete
Drying Shrinkage of Hardened Concrete method of testing describes the process of ascertaining the drying shrinkage or modification in length of concrete’s specimen because of alteration in moisture content.
Apparatus- An apparatus consisting of dial gauge with length measuring capacity equipped to measure accurate length for upto 0.005 mm.
- A drying oven which can be used to maintain a temperature of 50±10
- The test sample should consist of specimens the length of which can range between 15 cm to 30 cm, breadth 7.5 cm and width 7.5 cm.
- Make sure to cast the specimens of concrete according to suggested dimension and keep it stored in moist air for 3 to 7 days.
- Place a 6.5 mm diameter steel ball at each end’s center of the specimen by drilling a shallow depression.
- Once the steel balls have been fixed, clean them and make sure to remove any cement and then apply lubricating grease in order to avoid
- Allow the cement to get hard by keeping the specimen in moist condition for a day.
- Following 24 hours, get the test specimen immersed into water of temperature 24 to 300 C for atleast 28 days.
Written by:- Cement
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