Lab Report for Vee Bee Consistometer Test

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1. Objective

The workability of fresh concrete is a composite property, which includes the diverse requirements of stability, mobility, compactability, placeability and finishability. There are different methods for measuring the workability. Each of them measures only a particular aspect of it and there is really no unique test, which measures workability of concrete in its totality. The Vee Bee Consistometer Test indicates the workability of fresh concrete.

This test gives an indication of the mobility and to some extent of the compactibility of freshly mixed concrete. The test measures the relative effort required to change a mass of concrete from one definite shape to another (i.e., from conical to cylindrical) by means of vibration. The amount of effort (called remoulding effort) is taken as the time in seconds, required to complete the change.

Vee Bee consistometer test 1

The results of this test are of value when studying the mobility of the masses of concrete made with varying amounts of water, cement and with various types of grading of aggregate. The time required for complete remoulding in seconds is considered as a measure of workability and is expressed as the number of Vee-Bee seconds. The method is suitable for dry concrete. For concrete of slump in excess of 50mm, the remoulding is so quick that the time cannot be measured.

2. Apparatus Required

vee bee test apparatusFig. 1: Vee-Bee Consistometer
a) A vibrator table resting upon elastic supports
b) A metal pot
c) A sheet metal cone, open at both ends
d) A standard iron rod, Tamper (20 mm in diameter and 500 mm length)
weight machineFig. 2: Balance
A balance should be able to weigh up to 1 g accuracy.

3. Reference

IS 1199: 1959 Methods of Sampling and Analysis of Concrete (Eleventh revision). Reaffirmed- Dec 2013.

4. Procedure

  1. Slump test as described in “IS 1199:1959 Specifications for Concrete Slump Test Apparatus (Fourth revision). Reaffirmed- Dec 2013”. is performed, placing the slump cone inside the sheet metal cylindrical pot of the consistometer.
  2. The glass disc attached to the swivel arm shall be moved and placed just on the top of the slump cone in the pot and before the cone is lifted up, the position of the concrete cone shall be noted by adjusting the glass disc attached to the swivel arm. The cone shall then be lifted up and the slump noted on the graduated rod by lowering the glass disc on top of the concrete cone. The electrical vibrator shall then be switched on and the concrete shall be allowed to spread out in the pot.
  3. The vibration is continued till such time as the conical shape of the concrete disappears and the concrete assumes a cylindrical shape. This can be judged by observing the glass disc from the top for the disappearance of transparency.
  4. Immediately when the concrete fully assumes a cylindrical shape, the stopwatch is switched off. The time required for the shape of concrete to change from slump cone shape to cylindrical shape in seconds is known as Vee Bee Degree.
  5. This method is very suitable for very dry concrete whose slump value cannot be measured by the Slump Test, but the vibration is too vigorous for concrete with a slump greater than about 50 mm.

5. Observation And Recording

The time required for the shape of concrete to change from slump cone shape to cylindrical shape in seconds is known as Vee Bee Degree

6. Result

The Vee Bee Degree of concrete ………….. second(s) indicate Low/ Medium/ High Degree of workability

CodeDescription of BookDownload Link
IS 456:2000Plain and Reinforced Concrete - Code of PracticeDownload
IS 383:1970Specifications for fine & coarse aggregate from natural sources for concreteDownload
IS 2386 (Part I) 1963Methods of Test for Aggregates for Concrete, Part I: Particle Size and ShapeDownload
IS 2386 (Part II) 1963Methods of test for aggregates for concrete, Part II: Estimation of deleterious materials and organic impuritiesDownload
IS 2386 (Part III) 1963Methods of test for aggregates for concrete, Part 3: Specific gravity, density, voids, absorption and bulkingDownload
IS 2386 (Part IV) 1963Methods of test for aggregates for concrete, Part 4: Mechanical propertiesDownload
IS 2386 (Part V) 1963
Methods of Test for Aggregates for Concrete, Part V: SoundnessDownload
IS 2386 (Part VI) 1963Methods of test for aggregates for concrete, Part 6: Measuring mortar making properties of fine aggregatesDownload
IS 2386 (Part VII) 1963
Methods of Test for Aggregates for Concrete, Part VII: Alkali Aggregate ReactivityDownload
IS 2386 (Part VIII) 1963Methods of Test for Aggregates for Concrete, Part VIII: Petrographic ExaminationDownload
IS 2430-1986Methods for Sampling of Aggregates for ConcreteDownload
IS 4082-1996Recommendations on stacking and storage of construction materials and components at siteDownload
IS 2116-1980Sand for masonry mortars - SpecificationsDownload
IS 2250-1981 Code of Practice for Preparation and Use of Masonry Mortars
Download
IS 269-1989Specification for Ordinary Portland Cement, 33 GradeDownload
IS 8112-2013Specification for 43 grade ordinary Portland cement
Download
IS 12269-1987Specification for 53 grade ordinary Portland cement (BI-LINGUAL)Download
IS 455-1989Portland Slag Cement - SpecificationDownload
IS 1489-1991 (Part-I)Specification for Portland Pozzolana cement, Part 1: Flyash basedDownload
IS 1489-1991 (Part-II)Specification for Portland-Pozzolana cement, Part 2: calcined clay basedDownload
IS 6909-1990
Specification for supersulphated cementDownload
IS 8041-1990Specification for rapid hardening Portland cementDownload
IS 12330-1988Specification for sulfate resisting Portland cementDownload
IS 6452 (B)-1989High alumina cement for structural use(BI-LINGUAL)
Download
IS 4031-1996 (Part-I)Methods of physical tests for hydraulic cement, Part 1: Determination of fineness by dry sievingDownload
IS 4031-1999 (Part-II)Methods of physical tests for hydraulic cement, Part 2: Determination of fineness by specific surface by Blaine air permeability methodDownload
IS 4031-1988 (Part-III)Methods of physical tests for hydraulic cement, Part 3: Determination of soundnessDownload
IS 4031-1988 (Part-IV)Methods of physical tests for hydraulic cement, Part 4: Determination of consistency of standard cement pasteDownload
IS 4031-1988 (Part-V) Methods of physical tests for hydraulic cement, Part 5: Determination of initial and final setting timesDownload
IS 4031-1996 (Part-VI)Methods of physical tests for hydraulic cement, Part 6: Determination of compressive strength of hydraulic cement (other than masonry cement)Download
IS 4031-1988 (Part-VII)Methods of physical tests for hydraulic cement, Part 7: Determination of compressive strength of masonry cementDownload
IS 4031-1988 (Part-VIII)Methods of physical tests for hydraulic cement, Part 8: Determination of transverse and compressive strength of plastic mortar using prismDownload
IS 4031-1988 (Part-IX)
Methods of physical tests for hydraulic cement, Part 9: Determination of heat of hydrationDownload
IS 4031-1988 (Part-X)Methods of physical tests for hydraulic cement, Part 10: Determination of drying shrinkageDownload
IS 4031-1988 (Part-XI)Methods of physical tests for hydraulic cement, Part 11: Determination of densityDownload

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