Consistency is a general term related to the relative fluidity of the concrete. It is an indication of the amount of mixed water in relation to the amount of dry materials. Workability indicates whether or not concrete can be placed easily in some desired shape or location. To ensure that concrete achieves its maximum possible strength and yet retains its ease of placing on site, it is essential that the design of the concrete mix in relation to the water-cement ratio and workability is closely controlled. Following are the methods for determining the consistency of concrete.
Vee Bee Consistometer
IS 1199 & BS EN 12350
The instrument is used for workability as well as consistency of fresh concrete. A slump Cone and a graduated rod supplied with the instrument helps the operator to find out slump values and vibration table with container and acrylic disc is used to find out workability of concrete expressed in Vee Bee degrees, which is defined as the time in seconds to complete required vibrating at which the fresh concrete flows out sufficiently to come in contract of the entire face of acrylic disc.
Specification
The equipment consists of : A vibrating table size 380 mm long and 260 mm wide, resting upon elastic support at a height of about 305 mm above the floor, complete with Start/Stop switch, cord and plug.
A holder is fixed to the base in to which a swivel arm is telescoped with funnel and guide swivel arm is also detachable from the vibrating table. The divisions of scale on the rod record the slump of the concrete in millimeters. Supplied complete with a sheet metal container with lifting handles which can easily be fixed to the vibrating table. A slump cone open at both ends with lifting handles and a tamping rod of size 16 mm dia and 600 mm long rounded at both ends.
Slump Test Apparatus
IS 7320 & BS 1881-102
It is used for the determination of the consistency of freshly mixed concrete, where the maximum size of the aggregate does not exceed 38 mm.
Specification
The apparatus consists of one slump cone with handles and foot pieces. The slump cone has internal dimension 200 mm dia at base 100 mm top dia and 300 mm height foot pieces can be fixed to the clamps on the base plate. The base plate has lifting handle for easy transportation . One graduated steel rod 16 mm dia x 600 mm long rounded at both ends and graduated in mm is also supplied.
K-Slump Tester
K-Slump Tester for in-place measurements indicates correlation to the slump test. The probe determines workability of concrete and the degree of compaction. Includes correlation chart and instructions.
Chase Air Indicator
Kelley Ball Penetration Apparatus
Compaction Factor Apparatus
The apparatus is used for determining the workability of fresh concrete, provided the maximum size of the aggregate does not exceed 38mm. The test is particularly useful for concrete mixes of very low workability where true slump values are not reliable.
Specification:
It consists of two rigid conical hoppers and a cylinder mounted on a rigid metal frame. The lower openings of the hoppers are fitted with hinged trapdoors having a quick release catches. A circular metal plate is provided to cover the top of the cylinder.
Supplied complete with one plaster’s trowel and one tamping rod, 16 mm dia x 600 mm long, both ends rounded.
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J-Ring, Narrow Gap
The J-Ring test is used for determining the passing ability, the flow spread and the flow time of self compacting concrete as the concrete flows through the J- Ring apparatus. The J-Ring narrow gap with ø18 mm x 16 smooth bars is manufactured from stainless steel.
The Slump Cone is made from sheet steel protected against corrosion, with diameters; top 100 mm, base 200 mm and with a height of 300 mm. The Base plate is 900x900x3 mm square, made of stainless steel with engraved circles of 200 mm and 500 mm diameter conforming to EN 12350- 8. The Steel weighted collar is used to stabilize the slump cone on J-Ring or slump flow tests.
Concrete Flow Table Test Set
The test set is used for concrete mixes of high workability and determines flow index as an arithmetic mean of the diameter of the specimen after working on a flow table. The apparatus consists of a double steel table, an upper table measuring 700 x 700 mm and hinged at one side to the lower table. The top table is inscribed and all parts are protected against corrosion. The stainless steel cone has a 130 ±2 mm top diameter, 200 ±2 mm base diameter and 200 ±2 mm height and 1.5 mm thickness.
Dimensions: 700 x 850 x 300 mm, Weight (approx.) 40 kg Concrete flow table test set
V Funnel
The V Funnel apparatus is used to evaluate the flow time of freshly mixed self- compacting concrete. The test is not suitable when the maximum size of the aggregate exceeds 22.4 mm.
The test set consists of a stainless steel funnel placed vertically on a supporting stand. The discharge orifice is equipped with a lid, which can be momentarily opened.
The l shape box apparatus is supplied complete with:
Filling Hopper
Base
L Shape Box Apparatus
EN 12350-9
The L Shape box is used for determining the passing ability rate of freshly mixed self compacting concrete. The distance between 12 mm diameter bars can be set between 41±1 mm or 59±1 mm. L Shape box is designed for ease of cleaning the vertical and horizontal hoppers. The l shape box apparatus is supplied complete with:
- Filling Hopper
- Base
U Shape Box Apparatus
The U Shape box apparatus is used to determine the filling and passing ability of self-compacting concrete (SCC). The U box is made of stainless steel consisting of three 12 mm dia. Rebars. The U box is mounted on a frame with a fixing mechanism.
