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Blaine Air Permeability Apparatus VSLIC-C101

short info

The Apparatus is used to determine the fineness of Portland cement in terms of the specific surface expressed as total surface area in square centimeters per gram of cement.

Standard

IS 1727, 4031, 4825, ASTM C204, AASHTO T 153

Model

VSLIC-C101

Origin

Indian

Make/ OEM

VERTEX

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  • Description

  • SPECIFICATIONS

  • FEATURES

  • VIDEO
  •  New
    WORKING PRINCIPAL

OVERVIEW

Blaine Air Permeability Apparatus draws a defined volume of air through a prepared bed of cement of defined porosity. The Blaine Air fineness of cement has a significant effect on its physical properties when used in concrete. Generally, the finer the cement powder, the more rapid the concrete will set, as there is an increase in its surface area. The measure of fineness is usually undertaken by sieving, and the result assessed against the cement standard for compliance.
It is used for determination of fineness of cements, pozzolanas and other powdery materials in terms of specific surface, which is expressed as total surface area in square centimeters per gram of the material under test.

The apparatus comprises the following :-

  • Standard permeability cell made of brass,12.5 mm inside dia with one perforated metal disc and one plunger.
  • A U-Tube glass manometer with rubber coupling for permeability cell, mounted on a steel stand.
  • Latex rubber tubing, 30 cm long along with suction bulb.
  • 10 filter paper discs, No. 40
  • 250 ml Dibutyl phthalate liquid.


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SPECIFICATIONS

The equipment consists of following replaceable parts:

VSLIC C101 01           permeability cell

VSLIC C101 02           ‘U’ tube manometer, mounted on stand.

VSLIC C101 03           perforated metal disc.

VSLIC C101 04           plunger.

VSLIC C101 05           rubber stopper.

VSLIC C101 06           rubber tube, 20cm long.

VSLIC C101 07           filter paper discs.

VSLIC C101 08           dibutyl phthalate liquid, 100 ml bottle.

VSLIC C101 09           punch.

VSLIC C101 10           non perforated.

VSLIC C101 11           suction bulb.

FEATURES

Features:

  • Meets ASTM C204 and AASHTO T 153 requirements
  • Mounted on sturdy wood panel and base
  • Includes all necessary components

PRODUCT VIDEO

WORKING PRINCIPALNew

AIM:
The aim is to determine the fineness or surface area per gram of the cement.

PRINCIPLE:

The fineness of cement is measured as specific surface. Specific surface is expressed as the total surface area in square meters of all the cement particles in one kilogram of cement. The higher the specific surface is, the finer cement will be.

APPARATUS:
Measuring instruments

Name Range Accuracy
Blaine air permeability apparatus Refer to IS:5516
Balance 3 g 1 mg
Timer 30 min. 0.2 sec
Blaine Air Permeability Apparatus
Blaine Air Permeability Apparatus

PROCEDURE:

  1. Put a filter paper into the cell then weight 2.84g of cement sample into it.
  2. Put another filter paper on it and compress with the plunger.
  3. Attach the cell on top of the U-tube manometer.
  4. Evacuate the air in the manometer through the side tube using the aspirator bulb until the oil reaches level 1.
  5. Close the side valve and monitor the oil as it start to fall.
  6. Using a stop watch, measure the time taken for the oil to fall from level 2 to level 3.

Blaine =k√t

where k is 523.0547

Example: when t is obtained a 29 sec
S=523.0547√29
S=2817 cm²/gm

TECHNICAL DISCUSSION:

Fineness of cement affects hydration rate hence the rate of strength gain. The smaller the particle size, the greater the surface area-to-volume ratio, and thus, the more area available for water-cement interaction per unit volume. Therefore finer cement reacts faster with water and the rate of development of strength and corresponding heat of hydration is high.

Fineness test is used to check the proper grinding of cement and measures the surface area of the cement particles per unit mass.

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