Compaction factor test is adopted to determine the workability of concrete, where nominal size of aggregate does not exceed 40 mm. It is based upon the definition, that workability is that property of the concrete which determines the amount of work required to produce full compaction. the test consists essentially of applying a standard amount of work to standard quantity of concrete and measuring the resulting compaction. To find the workability of freshly prepared concrete, the test is carried out as per specifications of IS: 1199-1959. Workability gives an idea of the capability of being worked, i.e., idea to control the quantity of water in cement concrete mix to get uniform strength.
Specifications: -
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 trap-doors having 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, 16mm dia x 600mm long, one end rounded.
Cube : 150x150x150mm and 100x100x100MM
Cylindrical : 150mm (Dia) x 300mm (Height)
Casting iron material.
Slump Testing determines the consistency of fresh concrete. The Slump Cone is filled with fresh concrete in three layers, tamping between each to remove voids. The concrete is leveled off with the top of the Cone. On removing the cone, the slump is measured. The Slump Test can be used with fresh plastic concrete with aggregate size no more than 2 inches or 5 centimeters.
The Vibrating Table is used for compacting concrete cubes and cylinders. It is designed to carry a load of 140 kg. The apparatus consists of a motor fitted with a variable pitch pulley housed in a cabinet. The vibrations are imparted by means of off-balance masses rotating on a shaft of a vibrator clamped to the underside of the table top. The table top is 50cm x 50cm. and has stops along its edges to prevent moulds from walking off the table during vibration. A cross arm adjustable on a vertical rod at the center of the table is provided to hold the moulds while operating the table. The variable pitch pulley arrangement permits the frequency to be varied steplessly between a maximum of 3600 vibrations per minute. A speed regulation handle is provided for increasing or decreasing the frequency. A switch is provided for starting the motor, suitable for operation on 440 volts, 3 phase, 50 cycles, A.C.supply.
The Length Comparator allows measurement of the changes in length of cement/mortar and concrete test bar specimens. The instrument is provided with substantial rigidity through the use of a solid frame and cast steel base. The lower fixed anvil and the upper movable anvil are designed to accept the cast-in points of the specimen bars. The comparator includes a precision dial indicator and an Invar steel reference bar.
The Gilmore Apparatus determines the time of set for cement. It comprises a rigid aluminum and steel frame with two precisely machined stainless steel points and associated weights.
The mortar penetrometer is used to determine the rate of hardening of the mortar component of fresh concrete. The mortar is extracted by sieving. Measurement is made by first attaching one of the six penetration needles to the calibrated spring dynamometer. The Penetrometer is then pushed into the sample and the sliding will indicate the maximum test reading on the handle stem.
Concrete mixer laboratory type, electrically operated. Designed to remove the burden- some work of hand mixing. Uniform thoroughly mixed batches can be produced. The counter balanced drum is easy to tilt 1.1/2 to 2cu.ft.mix. The total drum volume is however 3cu.ft. Mounted on a sturdy rubber tyred stand, and the drum is mounted for end discharge and equipped with end towing pole. Equipped with ½ h.p. electric motor. Suitable for operation on 220/230 volts A.C. single phase.
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Flow Table |
Measuring Cylinders |
Sieves |
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Sieves Fine |
Tensile Tester |
Vee Bee Consistometer |
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