MK Instruments



The test is applicable to hot mix designs using bitumen and aggregates upto a maximum size of 25mm. In this method, the resistance to plastic deformation of cylindrical specimen of bitumenous mixture is measured when the same is loaded at periphery at 5 cm per min. This test procedure is used in designing and evaluating bituminous paving mixes. The test procedure is extensively used in routine test programmes for paving jobs. There are two major features of the Marshall method of designing mixes namely, a) Density – voids analysis b) Stability – flow tests. The marshall stability of mix is defined as a maximum load carried by a compacted specimen at a standard test temperature of 60ºC. The flow value is deformation the marshall test specimen under goes during the loading upto the maximum load, 0.25 mm units. In this test and attempt is made to determine optimum binder content for the type of aggregate mix and traffic intensity. The apparatus consists of :
  • A loading unit motorized, capacity 5000kgf with two telescopic pillars and an adjustable cross head. Limit switches are fitted inside to control upward or downward movement of the pillars. On-off reversing switch and indicator lamps are on the front side while a hand wheel to manually move the pillars is on the right. The load frame has fixed speed of 5.08cm per minute. Operated on 230 Volts A.C
  • 1 No. Compaction pedal with specimen mould holder
  • 2 Nos. Compaction Rammers, 4.5kg weight and free fall 45.7cm.
  • 1 No. Breaking head assembly with provision to fix flowmeter
  • 3 Nos. Specimen mould 10.16cm I.D. x 7.6cm high with base plate and extension collar.
  • 1 No. Kit for specimen extraction, consists of one each load transfer bar, steel ball, specimen extracting plate.



Automatic Compactor for Bituminous Mixes. The Automatic Compactor eliminates the laborious process of manual compaction and an even degree of compaction is achieved. The driven mechanism lifts the weight of 4.5kg and drops it through a correct height of 457 mm. The rammer foot is removable, which facilitates preheating. A compaction pedestal with specimen holder is fixed to the base. An Automatic Blow counter enables the number of blows to be present before each test and automatically stops the machine on completion. Suitable for operation on 230 V, 50 Hz, Single Phase, A.C. supply.



Often, existing concrete structures will need to be examined and tested to ensure the concrete remains of adequate strength and durability. This test is used to determine the compressive strength of a concrete core, which has usually been extracted from an existing structure. The value of compressive strength can then be used in conjuction with other measured properties to access the conditions of the concrete.

Extraction of concrete cores, achieved by rotary drilling using a diamond tipped hollow barrel, serve as a means of taking a sample of concrete which can then be used to determine various physical properties, but most commonly compressive strength.

Cores can generally be extracted from wherever access allows, and would include floor slabs, walls and columns. 10cm diameter cores, generally afford the minimum diameter required for a representative sample and require less reinstatement than larger diameter cores. 15cm diameter cores will generally give more representative samples than smaller diameter but require more reinstatement.

Available in Two Versions, Electrically Operated or Engine Operated for field operation. The Electrically operated machine is fitted with 3 HP 3 Phase AC Motor while on field use Engine operated models have petrol/kerosene run, air cooled 4 stoke single cylinder engine developing 3 to 4 HP at 3000 RPM. The drive from engine to drill head is through V belt and socket speed reducer with a standard reduction 8:1 and totally enclosed in belt guard and sealed. The engine starts with petrol and later on run on kerosene oil. The engine is with ISI certification Mark. The Engine operated models are fitted a water tank for on site application. Depending upon the application and preference of user, in option to petrol/kerosene driven engines.


MK 04140 - DUCTILITY TESTING MACHINE : IS : 1208 - 1058

Bituminous surfaces exposed to varying temperature conditions undergo a great deal of expansion and contraction. Therefore, an important characteristic of the binder is its ductility and the degree of ductility has an effect on the cracking of bituminous surfaces caused by traffic stress. The ductility of bitumen is expressed as the distance in centimetres to which a standard briquette can be elongated before the thread thus formed breaks under specified conditions.

A molten bitumen sample is poured into a standard mould, allowed to cool to room temperature and then placed in a water bath so that the briquette can be brought to test temperature before mounting in the testing machine.

Designed to test three specimens simultaneously. The machine consists of a carriage moving over a lead screw. An electric motor driven reduction gear unit ensures smooth constant speed and continuous operation. The entire assembly is mounted with a stainless steel lined water bath completely encased in metal bound hardwood. It is equipped with an electric pump circulator and heater. The temperature is controlled thermostatically. Two rates of travel i.e. 5 cm/min and 1 cm/min are provided. Suitable for operation on 230 V, 50 Hz, Single Phase, A.C. supply.


MK 04170 - PLANETARY MIXER : IS : 10890-1984

Electrically operated, fitted with heating jacket for thorough mixing of Bitumen. The mixer is operated by 0.5 HP single phase electric motor connected to epicyclic type stainless steel paddle to impart both planetary and revolving motion for uniform mixing. Mixer blade has low speed of 140 + 5 rpm and medium speed of 285 + 10 rpm, while it also has a planetary movement of 62 + 5 rpm in low range and planetary movement of 125 + 10 rpm in medium range. A stainless steel bowl of approx. 5 ltr capacity with handle is also supplied. The 500 Watts heating jacket with energy regulator to control the temp. is fitted below the bowl. Complete unit is supported on a strong iron frame. Suitable to work on 220V, 50 Hz, AC single



The Bitumen or Centrifuge Extractor are useful for determination of bitumen percentage in hot mixed paving mixtures and pavement samples. The mix is added with a solvent and dissolved bitumen is removed by centrifugal action. The extraction are available in Two Models. Hand Operated and Electrically Operated.

Hand Operated Model:
The Instrument is used for determination and checking of Bitumen Percentage in Bituminous mix, the mix is added with a solvent and dissolved bitumen is removed by centrifugal action. Consists of a removable Aluminium rotor bowl, capacity 1500 gms. With a cap and tightening nut. The bowl assembly is mounted on a vertical shaft, which protrudes from a cast housing. This shaft and thus the bowl is rotated fast manually by enclosed gears in the cast body & handle. Solvent is introduced during the test through the holes in the cap of the housing. A drain is provided to collect dissolved bitumen coming out of the rotating bowl and getting collected in the housing.

Electrically Operated Model:
Centrifuge Extractor, Electrically operated model is provided with a variable speed control device and a hand brake to stop rotation when switched off. The electric motor is 0.25 HP capacity coupled to a geared assembly. Suitable for operation on 230 Volts, 50 Hz, AC Single Phase.


MK 04200 - RING & BALL APPARATUS : IS 1205 1985

This apparatus is used to determine Softening point of Bitumen. It is that temperature at which a sample of bituminous material loaded by a 9.5mm dia steel ball, drops a specified distance when heated under specified conditions.

Specification :

The apparatus consists of steel bracket with a sliding plate support. That support has two holes of 10mm dia on which a ring and ball guide can be kept. A central hole on this plate is for inserting thermometer. Supplied with a glass beaker approximate 600ml, high and a hand stirrer and 2 Nos. 9.5mm dia steel balls


Electrical heating, with a Heater and Energy Regulator, Suitable for operation on 230 V, 50Hz, Single Phase, A.C. supply. Each unit is supplied with bath of heat resistant glass and the following * Tapered Rings, 2 Nos.
* Ball Centering Guide, 2 Nos.
* Steel Ball, of 9.5mm dia, 2 Nos.
* Ring Holder, 1 No.
* Electric Heater (Hot Plate), 1 No.




Used to determine grade of bitumen. The penetration tests determine consistency of bitumen for the purpose of grading. Depth in units 1/10 of millimeter to which a standard needle having a standard weight will penetrate vertically in a duration of five seconds at a temperature of 250C determines penetration for gradation. Two Models. Hand Operated and Electrically Operated.

Hand Operated Model:
It consists of a vertical pillar mounted on a base provided with levelling screws. The head, together with dial plunger rod a cone (or needle) slides on a pillar an can be clamped at any desired height. A rack and pinion and pointer assemble provides fine adjustment of needle or cone tip to sample. It incorporates a clutch mechanism. Which makes reading of penetration and subsequent resetting a simple and accurate operation. The dial is graduated in 400 1/10 and the millimeter subdivisions and the needle pointer against figures makes easy reading. Supplied with a bitumen penetration needle, ring weight One 50gm, two sample containers.

Electrically Operated Model:
Bitumen Penetrometer, Electrically operated model is provided with Automatic Digital Timer and electrical arrangement to carry out the test without needle of stop watch and with great ease and accuracy.



It is used to determining the viscosity of fuel oil and lubricating oil (thin and thick). The unit consists of stain less steel bath oil cup that centrally placed in water bath. The bath has a lid, which contains a water-cooling tube. Two handles with two starrier blades, the thermometer soaked and a straight heater, stirring is done by turntable arrangements. Operates on 220 volts AC 50 HZ.



For determining the hardness number of Mastic Asphalt for flooring. It consist of an internally insulated cabinet to the base of which is fitted a water bath having two taps. The bath is heated by an immersion heater and the temperature is controlled with the thermostat at 35° +/- 0.5° C. A 6.5mm dia pin is loaded on the specimen by means of a lever to give a 31.7 Kg weight. A dial gauge 0.01 x 25 mm is provided to record the penetration of pin into the specimen.




Lightweight Aluminium construction Ease of Transportation Unique Telescopic Design Simplifying Field set up Compact, Thereby reducing the amount of storage space needed Benkelman Beam utilizes the technique of using balanced beam in conjunction with a suitable vehicle to measure road flexure The improved Benkelman Beam is a convenient, accurate device for measuring the deflection of flexible pavements under moving wheel loads. Operating on a simple lever arm principle, the unit consists. Supplied with carrying case.




This dual purpose oven is designed to determine the loss in weight of bitumen and flux oils (Loss on Heating test) and the effect of heat and air on asphaltic materials (Thin Film test). The unit is heavily insulated and has a double glass door for viewing the test chamber thermometer and samples. Temperature is controlled at 163° C ± 1° C by means of a variable temperature controller and thermostat. Two rotating platforms are supplied with each oven: One accepts 9 standard penetration cups for the loss on heating test, the other accepts two 140mm diameter test pans for the thin film test. The platforms are rotated at 5 to 6 rpm by an external motor. Chamber dimensions 350 x 350 x 350mm (length x width x height)



Used for determination of kinematic and intrinsic viscosity of fuels, lubricants & petrochem raw materials at constant temperatures in accordance with ASTM D 445 and other equivalent methods.

Temp. Range

50C above ambient to 99.90C +/- 0.50C or as per requirement

Temp. Control

Digital Temperature Controller

Inner Chamber

Stainless Steel

Outer Chamber

Mild Steel Powder Coated / Stainless Steel


S.S. Lid with Viscometer Holders

Glass Window

TOUGHNED Glass Window at Front & Back side of the Bath.


Illumination Provided behind the TOUGHNED Glass


Glasswool Insulation


S.S. Immersion Heater


CIRCULATORY Motorised Stirrer

Capacity of Viscometer

2, 4 and 6 (as per requirement)



The separation of modifier and bitumen during Hot storage and cold static condition is evaluated by comparing the ring and ball softening point of the top and bottom samples taken from a conditioned, sealed tube of polymer modified bitumen. The conditioning consist of placing a sealed tube of modified bitumen in a vertical position at 163 +/- 5 deg C in an oven and at 6.7 +/- 5 deg C in a freezer for specified time.

Supplied Complete with following:-

  • Oven capable of maintaining 163 +/- 5 deg C.
  • Freezer, capable of maintaining 6.7 +/- 5 deg C
  • Rack, capable of supporting the 3 aluminium tubes in vertical condition in the Oven and freezer.
  • Spatula and Hammer.
  • 20cm dia fine sieve of 600 micron mesh.
  • Glass rod.
  • Tweezer.
  • Pair of Asbestos Hand Gloves
  • Aluminium tubes of 25.4mm dia X 136.7mm length X 1mm thickness - 3 Nos.
  • Glass funnel


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

3 Meter Length. Complete with measuring wedge.



Useful for specific gravity test by removing air voids from the Bitumen Mix.
Oil Sealed Rotary High Vacuum Pump capacity 50 Ltr/min. complete with 0.25 HP- 1 Phase- 220 V- CROMPTON Make Electric Motor. Ultimate Vaccum : 0.05 mm of Hg. Complete with Non-Return Valve, Belt guard and vaccum gauge with regulator.



Used to maintain in water the Marshal specimens to be tested at 600 + 10C (Asphalt specimens) or 37.8 + 10C (Tar Specimens) as prescribed by the specifications. The same Waterbath can also be used for penetration test, stripping test or even soundness test of cement with the use of additional accessories.

Rectangular, Double walled construction. Inner Chamber made of stainless steel and outer body made of mild steel duly powder coated. Temperature Range 50C above ambient to 990C. Fitted with immersion type heater, Digital Temperature Controller cum Indicator accuracy + 0.50C. Operating on 230V AC. Fitted with circular pump with stirrer.

Size in cm

Ratting Watts

12” x 10” x 8”


18” x 12” x 10”


18” x 14” x 12”