ASTM C 531 : Standard Test Method for Linear Shrinkage and Coefficient of Thermal Expansion

This test method covers the measurement of the linear
shrinkage during setting and curing and the coefficient of
thermal expansion of chemical-resistant mortars, grouts, mono�lithic surfacings, and polymer concretes.

Linear shrinkage :- The material to be tested is placed
in the mold in a fluid or plastic state. The linear shrinkage measured is the
change in length that occurs after the material is rigid enough and strong enough
to move the studs.

Percent shrinkage :- ( L0 –L /L0 )
× 100

where: Lo = original length (length of standard bar),

L = Change in length after curing

Coefficient of thermal expansion :- The change in length
at a specific elevated temperature is measured and used to calculate the
coefficient of thermal expansion. The bars shall be (25 mm) square by (250 mm)
between studs when molded.

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