Aggregate Testing Equipments

_{The aggregate impact value of coarse aggregate provides a relative measure of the resistance of an aggregate to sudden shock or impact. The oven dried and accurately weighed aggregates are subjected to a total of 15 blows of specified weight and fall and percentage of fines formed in terms of the total weight of the sample is expressed as the aggregate impact value.}

 _{GENERAL DESCRIPTION & SPECIFICATIONS:}

 _{Consists of base weighing between 20-30 kg with a lower surface of not less than 30cm and support columns to form a rigid frame work around the quick release trigger mechanism to ensure an effective free fall of the hammer during test. The free fall can be adjusted through 380 + 5.0mm. The hammer is provided with a locking arrangement. A metal tup (hammer) weighing 13.5 to 14.0 kg, the lower end of in cylinderical shape, 100mm in diameter and 5cm long with a 2mm chamfer at the lower edge and case hardened. Complete with a cylindrical cup, 102mm dia x 50mm depth, one measure 75mm dia x 50mm deep and a tamping rod of circular cross section 10mm in diameter and 230mm long, rounded at one end.}

 _{OPTIONAL ACCESSORIES:}

 _{The following accessories a}.re not part of the standard supply and are supplied at an extra cost.

 ·       Test Sieve 10mm, 12.5mm and 2.36mm opening.

·        Laboratory Oven.

·        Automatic Blow Counter.

·        Electronic Balance 500gm x 100 mg / Two Pan Balance

Consists of a rigid support frame, incorporating a water tank mounted on a platform. A mechanical lifting device is used to raise the water tank through the frame height immersing the specimen suspended below the balance. The balance supplied may also be used as a standard weighing device, thus providing a versatile and comprehensive weighing system in the laboratory 

WEIGHING IN AIR AND IN WATER FRAME : Consisting of a rigid frame, water tank, and cradle.

introduction:

 the machine is used for testing crushed slag, crushed and uncrushed gravel for resistance to abrasion. The aim of the test is to find the percentage wear due to the relative rubbing action between the aggregates and steel balls as abrasive charge. The oven-dried arrangements are weighted and rotated along with abrasive charge in the machine for the 500 or 1000 revolutions and percentage of wear so found out its reported as los angeles abrasion value.

 general description & specifications :

 consists of a hollow steel cylinder, closed at both ends, having an inside diameter of 700mm and inside length of 500mm. The cylinder mounted on a sturdy frame on ball bearings. The opening is closed dust tight with a removable bolted cover in place. A detachable shelf which extends through the drum catches the abrasive charge and does not allow it to fall on the cover. The drum is rotated at a speed of 30-33 rpm by an electric motor through a heavy duty reduction gear. Fitted with revolution counter and push button starter. Supplied complete with a tray for collection of the material. Abrasive charge consists of set of 12 nos. Cast iron spheres or steel spheres (hardened steel balls) approximately 48mm diameter each weigh between 390-445 gram. Complete as above.

 Optional accessories:

 The following accessories are not part of the standard supply and are supplied at an extra cost.

1        Laboratory oven.

2       Test sieve 1. 7mm

3       Electronic balance of 15 kg x 1 gm

4       Spare abrasive charge.

INTRODUCTION:

Although generally not such an important property of concrete than compressive strength, tensile strength values are often important to know when the concrete used free of reinforcement and may be subjected to some tensile force.  The test method essentially involves applying a load at the centre of a beam of concrete supported at its ends. The load required to break the specimen is then recorded. 

GENERAL DESCRIPTION AND SPECIFICATION

The machine consists of a motorized load frame. The lower platen has two rollers, the distance between which is adjustable. For 150 mm x 150 mm x 700 mm beam, the centre distance between the rollers is 600 mm, while it is 400 mm for beams of size 100 mm x 100 mm x 500 mm. The upper platen has also a pair of rollers whose distance adjustable. It is 200 mm centre to centre, for 150 mm x 150 mm x 700 mm size beam and 133 mm for 100 mm x 100 mm x 500 mm size beam. Total capacity of the machine is 100 KN. 150mm dia pressure gauge of 0-100 KN x 1 KN least count to indicate load is fixed on the load frame.  A separate electrically cum hand operated pumping unit housed in a cabinet is supplied. On/Off switch and a slow/fast lever to control rate of loading are fitted on the front panel of the pumping unit. A facility for hand operation is provided. A micro switch and relay fitted inside the pressure gauge protect the unit from over loading.

Hand operated version consists of a load frame. A small hand pumping unit is attached to the load frame. Since this is a hand operated light weight machine. It is useful for field laboratory also.

As per IS: 516, BS: 1881, ASTM C78

OPTIONAL ACCESSORIES (AT EXTRA COST)

·                    Spare Oil seal

·                    Hydraulic Oil ( tin of 5 ltrs)

·                    Beam Mould 10 X 10 X 50 cm

·                    Beam Mould 15 X 15 X 60 cm

·                    Beam Mould 15 X 15 X 70 cm

·                    Beam Mould 15 X 15 X 75 cm

·                    Trowel

·                    Concrete Scoop

This sieve shaker is designed to carry up to 7 sieves of 6 inch or 8 inch diameter. The 12 inch dia.sieves can be used with the help of Adaptor. A 1/4 HP. motor through a reduction gear immersed in oil drives the shaker. The sieve table dies not rotate but is inclined from the vertical axis and the direction of inclination changes progressively in clockwise direction. If the stop-pin below the table is removed. the shaker can have a rotary motion. In addition to this gyratory motion of the table, there is an upward and downward movement ensuring that each square cm of the sieve is utilized. A pair of rods and a holder is supplied. The holder can be fixed on the top of the upper most sieves, and thus the sieve set is firmly held. Suitable for operation on 230 volts, 50 cycles single phase A.C. Supply.                      

Adaptor for 30cm dia test sieves can be fitted in above.

FOR 45CM DIA SIEVES :-This sieve shaker is designed to carry up to 7 sieves of 18"  diameter. The shaker is driven by a 1/2 H.P.Electric Motor through a reduction gear. The sieve table does not rotate but is inclined from the vertical axis and the direction of inclination changes progressively in the clockwise direction, in addition to this gyratory motion of the table, there is and upward and downward movement at a frequency of about 270 vibration per minutes ensuring that each square inch of the sieve is utilised. The whole gear mechanism runs in an oil bath, without test sieves or time switch. Suitable for operation from 220 Volts 50 cycles A.C. supply.

OPTIONAL EXTRA

·        DIGITAL Time switch 0-99 minutes for above

        ·     MECHANICAL Time switch 0-60 minutes for above

è    Size : 4” X 6”

è    Size : 6” x 8”

è    Size : 4” x 10”

Laboratory Jaw Crusher is designed to speed up the crushing of aggregate, ores, minerals, coal, coke, chemicals and other similar materials. It is compact and of rugged construction for general laboratory or small pilot plant operations.

Two jaws of manganese steel are provided in the jaw crusher. The moveable jaw produces two blows for every revolution, thus reducing over sizing to a minimum. A combination of forward and downward and strokes with a rocking action exerts pressure on the coarse material to pass through the jaws. A hopper is provided at the top for feeding materials. The smooth jaws ensure a uniform product and easy cleaning is possible.

Max Size of feed    : 50mm (approx) Product discharge

Size                      : 6mm to 18mm (adjustable)

Capacity               : 80kG/Hr(approx).  (based on material).

Operation on          : 440v, 3Ph, 50Hz, A.C. complete with a 3H.P. 

                              motor, a starter 'v' belt pulley drive and

                              mounting.