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Sand And Aggregates
Deval Abrasion Testing Machine
This machines used the for determination of
resistance to wear by attrition iron cylinders 20 cm. dia 34 cm. long with
dust and water-tight covers, mounted on shaft with their axis inclined at 30
deg. to the axis of rotation of the shaft. Rotation speed is 30-33 rpm.
Dorry Abrasion Testing
This is for aggregates resistance to abrasion. The
apparatus consists of a metal disc which revolves in a horizontal plane on a
vertical shaft. A suitable attachment for holding the specimen with is axis
vertical and its lower end pressed with a prescribed pressure against the
surface of the disc (the distance from the centre of specimen to the centre
of shaft being 25 cm) is provided. A convenient funnel for feeding sand
continuously upon the rotating disc is also provided. The machine is fitted
with a ¼ h.p. electric motor, driven through a reduction gear to give
28-30 revolution of the disc per minute. Suitable for operation from 220/230
volts single phase, A.C. supply
Meets :- BS:812
Accelerated Polishing Machine
The object of this apparatus is to determine the
polished stone value which gives a relative measure of the extent to which
different types of road stones in the wearing surface will polish under
traffic. The complete apparatus consists of the following:
Meets: - IS: 2386 (Part 4),
- An accelerated polishing machine
- A friction tester.
- IS test sieves of sizes 10mm., 8.0mm.(both perforated plate),
425micron, 300micron, 212micron, 150micron.
A pendulum arm, having a spring-loaded rubber
slider on the pendulum foot. Device is placed on the portion of the road
surface to be tested. It is then leveled, and the height of the center of
suspension of the pendulum is adjusted to a fixed value which is read on a
The pendulum is then released from its horizontal position, to swing down
freely until the rubber slider contacts the test surface. As the slider
travels across the surface for a fixed distance, the pendulum is slowed and
a frictionally-constrained pointer affixed to the pendulum arm measures the
highest point in the pendulum arc.
Meets: - IS: 2386 (Part 4), ASTM E303.
CLIMATIC CABINET FOR "FREEZING AND THAWING CYCLES
- Chamber size Inner dimensions: 560 x 620 x 1515 (h) mm
- Temperature Range: from -20 to +60°C +/- 1°.
- Humidity Range: 10/90% RH tolerance +/- 5% dew point limit +2°C.
- 3 shelves of adjustable height.
- Power: 220 V, 50 Hz, single phase,
Chaplin Abrasion Tester
The BCA (Chaplin) Abrasion Tester gives a guide to
the abrasion resistance of concrete floors. It can also be used to test the
effectiveness of surface treatments used to protect or upgrade sub-standard
floors. The depth of wear in the concrete floor brought about by the action
of 75mm diameter by 20mm wide hardened steel wheels is used as a guide to
the abrasion resistance. The apparatus is suitable for compliance testing to
the requirements of BS 8204: 1987: Part 2 and EN 13892-4.
The abrasion tester consists of three 75mm diameter hardened steel wheels
mounted tangentially on a circular steel carrier plate. The wheels are
fitted such that they are free to rotate but not castor. The carrier plate
is connected to a single phase electric motor which runs at approximately
190 rpm. mounted in a steel frame.
An umbilical cable connects the electric motor to a small control box, which
monitors the number of revolutions executed by the shaft of the motor. At
the end of a preset number of revolutions, a counter in the control box
switches off the power to the electric motor. During a test, the Abrasion
Tester is completely covered by a Safety Enclosure which reduces the noise
level and prevents access to the rotating parts of the machine.
The enclosure has a Safety 'Off' switch and is also fitted with
micro-switches at the bottom which switch off the Tester if the enclosure is
raised. Electronic Depth Gauge A tripod gauge with a user selectable
resolution of 0.01mm. the battery operated gauge is fitted with a zero
button and an ON/OFF switch.
Meets: - BS 8204: 1987: Part 2 and EN 13892-4.