Description
SPECIFICATIONS
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WORKING PRINCIPAL

OVERVIEW

The instrument consists of a channeled base over which two vertical pillars are fixed.
An adjustable cross plate is at the top. A dial gauge, reading to 0.002mm 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 an insulated grip and with 6.5mm dia balls mounted on the ends.

SPECIFICATIONS

FEATURES

The instrument consists of a channeled base over which two vertical pillars are fixed.
An adjustable cross plate is at the top. A dial gauge, reading to 0.002mm x 12mm.
The plunger end of the dial gauge can be located upon a 6.5mm.
Stainless steel standardization bar with an insulated grip and with 6.5mm dia.

PRODUCT VIDEO

WORKING PRINCIPALNew

DRYING SHRINKAGE OF CONCRETE or TEST FOR LENGTH CHANGE OF CONCRETE, (IS: 1199 – 1959)

IS Code for Drying Shrinkage Test of Concrete:-

IS: 1199 – 1959

Overview:- Determination of drying shrinkage of concrete.
APPARATUS REQUIRED FOR THE TEST:-

Mould
Oven
Curing tank
Length – comparator

https://civilalliedgyan.blogspot.com/2020/04/test-for-drying-shrinkage-of-concrete.html

Length- comparator

PROCEDURE OF THE TEST:-

The drying shrinkage is the difference between the original wet measurement and dry measurement which is expressed as a percentage of dry length of the rectangular molded sample.
Make the specimen mould (2 layer compaction) of size 7.5cm × 7.5cm × 15cm or 7.5cm × 7.5cm × 30cm and control curing 3 to 7 days.
Remove the specimen from the mould and keep the mould in water at 25°C to 29 °C for 28 days after the concrete has been made or other time as may be specified remove from water and measure the length of the bar (L₁).
Now keeping the bar at temperature 49°C to 51°C and humidity 17 % RH for 44 hour and cooling 4 hour. This process repeated and constant length is attained, (L₂).

Calculation:-

The percentage in difference of final length to the initial length i.e. (L₁– L₂) is the drying shrinkage.

RESULT:–

Length of sample measured to an accuracy of 0.005 mm.

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