17-01-2014, 02:47 PM
SOUNDNESS
AIM
To determine the soundness of cement by Le-Chatelier method
as per IS: 4031 (Part 3) - 1988.
PROCEDURE
i)
Place the mould on a glass sheet and fill it with the cement
paste formed by gauging cement with 0.78 times the water
required to give a paste of standard consistency (see
Para 1.2).
ii) Cover the mould with another piece of glass sheet, place a
small weight on this covering glass sheet and immediately
submerge the whole assembly in water at a temperature of
o
27 ± 2 C and keep it there for 24hrs.
iii) Measure the distance separating the indicator points to the
nearest 0.5mm (say d l ).
iv) Submerge the mould again in water at the temperature
prescribed above. Bring the water to boiling point in 25 to 30
minutes and keep it boiling for 3hrs.
v) Remove the mould from the water, allow it to cool and
measure the distance between the indicator points (say d 2 ).
vi) (d 2 – d l ) represents the expansion of cement.
REPORTING OF RESULTS
Calculate the mean of the two values to the nearest 0.5mm to
represent the expansion of cement.