short info

Length Comparator is used to measure the drying shrinkage of autoclaved portland cement and potential expensive reactivity of Cement aggregate combinations in mortar bars during storage on self-drying.

Standard

IS 1199-1959, IS 4031 1968 BS 1881, ASTM C 151, C490.

Model

VSLIC-C114

Origin

Indian

Make/ OEM

VERTEX

  • Description

  • SPECIFICATIONS

  • FEATURES

  • VIDEO
  •  New
    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

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.

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:- 

  1. 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.
  2. 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.
  3. 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).
  4. 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. (L– L2) is the drying shrinkage.

RESULT:

Length of sample measured to an accuracy of 0.005 mm. 

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