Length Comparator - ASI-539

It is used to measure the drying shrinkage of concrete autoclave expansion of Portland cement and potential expansive reactivity of cement aggregate combinations in mortar bars during storage, on self drying. Specifications: The instrument consists ofa chanelled base over which two vertical pillars are fixed. An adjustable cross plate is at the top. A dial guage, reading to.002mm x 12 mm. can be fixed to the top cross plate. The plunger end of the dial gauge can be located upon a 6.5mm. dia. ball orother reference 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 .0001inch x 1/2inch dial gauge at extra cost if indicated at the time of placing the order.

Specifications: The unit consists of two movable frames pivoted at one end. The extensometer is fixed to the specimen with the help of tightening screws. The lateral extension is indicated on a dial gauge of .002mm x 12mm travel. The extension is magnified 2.5 times and the dial gauge readings are to be divided by 2.5 to get the exact read-ings. A spacer strip is provided to initially set the dial gauge, and can be removed after initial setting. Supplied in a wooden carrying case.