Length Comparator

The apparatus can be used for three basic tests :

• Initial drying shrinkage – The difference between the length of the cured specimen and the length when it is dried.
• Drying shrinkage - The difference between the length of the specimen from existing structure and its length when completely dried.
• Moisture movement - The difference between the length of the dried specimen and its length when again saturated with water.

The apparatus consists of a frame with adjustable cross plate and a recessed seating and a 300 ± 1.0 mm long alloy steel reference bar having coefficient of thermal expansion less than 2x10-6deg with 6 mm dia steel balls mounted at the ends. Supplied complete, with a dial gauge 0.002 mm x 10 mm.