JMT - 531
IS : 1199 - 1959, IS : 4031 - 1968.
It is used to measure the drying shrinkage of concrete autoclave expansion of Portland cement and potential expansive reactivity of cement aggregate combination in mortar bar during storage, on self drying.
Specification :The instrument consists of a channelled base over which two vertical pillars and fixed. An adjustable cross plate is at the top. A dial gauge, reading to .002mm x 12mm. can be fixed to the top cross plate. The plunger end of the dial gauge can be located upon a 6.5mm. dia ball or other reference point cemented in the specimen. On the base there is a similar recessed seating in which can be placed a second ball or reference point in the specimen.
Complete with a stainless steel standardization bar with insulated grip and with 6.5mm. dia. balls mounted in the ends. The unit can be supplied with a .001inch x 1/2inch dial gauge at extra cost if indicated at the time of the placing order.