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Why shrinkage is more in Singly Reinforced section as compare to doubly Reinforced Section in RCC ?
Raghvendra_Rai
Yes, your statement is true, but I was looking for a detailed explanation of why and what is the mechanism behind this high/low Shrinkage.
Yes, your statement is true, but I was looking for a detailed explanation of why and what is the mechanism behind this high/low Shrinkage.
See lessHow to Calculate the Specific Gravity of Cement with respect to IS code?
Raghvendra_Rai
IS 4031(part 11): 1988 specifies the following test procedure to be adopted for the Determination of Specific Gravity of Cement and the test should be done at room temperature. Apparatus: Standard Le – Chatelier Flask Analytical balance of accuracy +/-0.0002g Constant temperature water bath Cement KRead more
IS 4031(part 11): 1988 specifies the following test procedure to be adopted for the Determination of Specific Gravity of Cement and the test should be done at room temperature.
Apparatus:
Procedure:
- Kerosene is taken in the Le-Chateliers Flask, such that the level is in between the ‘0’ & ‘1’ (V1) mark.
- 64 g (W) cement is then added to the flask using a funnel. Care to be taken so that cement particles did not stick to the walls of the flask.
- The neck should be sealed with the glass lid or cork and rotated in all axis in order to ensure all the air bubbles are removed, after adding cement.
- The flask is then placed in room temperature inside a water bath for 24 hours.
- The final reading of the level in the flask (V2) mark is then noted after the 24 hour period.
- Then specific gravity of cement can be calculated using following equation.
- Density = Mass of cement(gm)/Displaced volume (cm3)
- Density = W/(V2-V1)
See lessIt is based on the fact the change in volume observed is equal to the volume of cement and we already know the weight so Density/ Specific Gravity can be calculated and Kerosene is used here because it is a non-polar liquid.