MK Instruments

AGGREGATE TESTING EQUIPMENTS

MK A.5.1410 - AGGREGATE IMPACT TESTING MACHINE : IS : 2386 - IV

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 accuracy 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.

The Apparatus consists of following:-

  • A Testing Machine having a metal base with a painted lower surface of not less than 30cm in diameter. It is supported on level and plane concrete floor of minimum 45cm thickness. The machine have provisions for fixing its base.
  • A Cylinderical cup of internal diameter of 102mm, depth 50mm and minimum thickness 6.3mm.
  • A metal hammer or tup weighing 13.5 to 14 kg the lower end being cylindrical in shape, 50mm long, 100.0mm in diameter with a 2mm chamfer at the lower edge and case hardened. The hammer will slide freely between vertical guides and be concentric with the cup. Free fall of hammer will be within 380 + 5 mm
  • A Cylinderical metal measure having internal diameter 75mm and depth 50mm for measuring aggregates.
  • Tamping Rod 10mm in diameter and 230mm long, rounded at one end.

 

MK A.5.1425 - AGGREGATE CRUSHING VALUE APPARATUS : IS : 2386 – IV

The Aggregate Crushing value provides a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load. The oven dried and accurately weighed aggregates are subjected to crushing test on compression testing machine and weight of the resultant fines passing the specified IS sieve to the total weight of the sample expressed as a percentage is defined as Aggregate Crushing Value. The apparatus is available in three size 75mm dia for 1/8” to 1/4” size aggregates, 150mm dia for 3/8” to 3/4” aggregate (standard) and 300mm dia for 1” to 2” aggregate.

The Apparatus consists of Test Mould of a 15cm diameter open ended cylinder with base plate, plunger having a piston of diameter 15cm, with a hole provided across the stem of the plunger so that a rod could be inserted for lifting or placing the plunger in the cylinder.

A straight metal tamping rod of circular cross-section 16mm in diameter and 45 to 60 cm long, rounded at one end.

 

MK A.5.1425 - AGGREGATE CRUSHING VALUE APPARATUS : IS : 2386 – IV

Determines bulk density or unit weight of aggregates.

Specification :

Consists of M.S. Cylindrical Container 150mm +/-0.5mm dia x 130mm to 140mm high with base plate 200 to 230mm/sqr x 6mm thick. A Plunger of 148mm +/-0.5mm dia x 100 to 115mm high. Supplied complete with Tamping Rod, 16mm dia x 600mm long, both ends rounded, 1 no. Metal Measure 115+/- 0.5mm dia x 180 +/- 0.5mm high.
 

MK A.5.1440 - LOS ANGELES ABRASION TESTING MACHINE : IS : 2386 – IV

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 used as abrasive charge. The oven dried aggregates are weighed and rotated along with abrasive charge in the machine for the 500 or 1000 revolutions and percentage of wear so found out is reported as Los Angeles abrasion value.

The machine consists of a hollow cylinder mounted horizontally on a sturdy frame on ball bearings. There is an opening which can be closed with adjust tight cover to facilitate charging and discharging the drum with the material under test. A detachable shelf which extends throughout the inside length of the drum which catches the abrasive charge and does not allow it to fall on the cover. The drum is rotated by an electric motor through a heavy reduction gear at a speed of 30-33 R.P.M. A revolution counter is fitted to the frame. A tray is supplied for collection of the material at the end of the test. Complete with abrasive charge consisting of a set of twelve hardened steel balls, approximately 48mm dia, suitable for operation on 440V, 3 phase, 50 cycles, A.C. Supply.

 

MK A.5.1470 - THICKNESS GAUGE OR FLAKINESS GAUGE - IS : 2386- I.

The Thickness Gauge or Flakiness index of aggregates is the percentage by weight of particles whose least dimension (thickness) is less than three-fifths (0.6 times) of their mean dimensions. This test is not applicable to sizes smaller than 6.3mm.

It consists of a frame with sliding panel with accurate slots of different standard width length, the complete assembly is chrome plated or powder coated.

 

MK A.5.1480 - LENGTH GAUGE OR ELONGATION GAUGE - IS : 2386 – I

The Length Gauge or Elongation index of an aggregate is the percentage by weight of particles whose greatest dimension(length) is less than nine-fifths (1.8 times) of their mean dimensions. This test is not applicable to sizes smaller than 6.3mm.

it consists of a hard wood base with vertically mounted metal studs as specified in the Indian Standard.

 

MK A.5.1460 - DENSITY BASKET : IS : 2386 – III

Specifications:

Made of brass with stainless steel wire mesh 6.3mm size ruggedly constructed, approximately 20cm dia x 20cm high. Complete with handle.

 

MK A.5.1490 - LABORATORY JAW CRUSHER

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.

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 experts pressure on the coarse material to pass through the jaws. A hopper is provided at the top for feeding materials. The smooth jaw ensure a uniform product and easy cleaning is possible.

 

MK A.5.1500 - LABORATORY PULVERISER

Laboratory Pulveriser is a disc type grinder, designed for grinding material to produce a fine mesh sample in one operation. It is a self contained grinder furnished with a rotating disc having a planetary movement in a vertical plane. This feature gives added life to the wearing parts and delivers a product to uniform fineness. The pulverizer will reduce 1 pounds sample of quartz type material to 100 mesh in 1 minute. Maximum feed size is 1/4 inch Grinding is done between two discs one of which is stationary and the other reolving eccentrically at high speed. The apparatus is supplied with heat treated disc of 7 inches in diameter adjustment of size of product may be made by use of a convenient hand wheel while the machine is in operation or at rest. A self locking device holds the hinged grinding chamber in place and affords easy and quick access to the grinding chamber for removal of ground samples and for cleaning.

The Laboratory Pulverizer is supplied complete with a 3 HP motor, starting switch, V-belt pully drive and mounting electrical requirements are 440 volts 3 phase A.C.

 

MK A.5.1450 - RIFFLE SAMPLE DIVIDER – IS : 2720, 1607

Efficient sampling out of bulk materials/deposits is the most important for getting the true idea about the bulk material. The volume of material to be tested is usually quite huge and it requires reduction in volume in a methodical manner. The Riffle Sample Divider helps to reduce the bulk while maintaining the character of the material and thus it is a helpful, light and handy device for sampling work. The standard units are made of GI sheet and mounted on rigid steel frame and supplied with three pans and one scoop.

Available in following sizes.

Sizes : 13mm - 14 slots
Sizes : 20mm - 16 slots
Sizes : 25mm - 16 slots
Sizes : 40mm - 16 slots

 

MK A.5.1510 - STRAIGHT EDGE

Used to measure irregularities in road pavement. Made from steel channel or Alluminium Alloy.

3 Meter Length. Complete with measuring wedge.

 

 

MK A.5.1520 - CAMBER BOARD

Used to check and maintain the camber of the road as per design. Made of Aluminium section of size 24mm x 45mm of thick gauge. Size : 3 meter and Ratio : 2.0%.

Sizes available as per requirement.


   
 

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