Cone Penetrometer

Cone Penetrometer

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It may be defined as the hardness softness of the bitumen by measuring the depth in tenth of a millimeter to which standard loaded needle will penetrate vertically in five minutes the penetration of bituminous material is the distance in tenth of a millimeter that a standard needle will penetrate vertically into a sample of the material under standard conditions of temperature load and time.
Soften the material to pouring temperature not more than 60 °C for tars and not more than 90 °C for bituminous materials above the approximate softening point and see that it is homogeneous and is free from air bubbles and water by stirring pour the material into the container to a depth at least 10 mm in excess of the expected penetration protect the sample and allow it to cool place it in the bath which is to be kept at 25 °C unless otherwise specified the test is carried out at 25 °C adjust the needle to make contact with surface of the sample bring the pointer to zero release the needle and measure the distance penetrated make three determinations and express in one tenth of a millimeter.

Features:-
Sampled filled
Spirit level
Penetration needle
Concept
The dial reading is recorded
The above procedure is repeated for thrice
The container is kept on the stand of the penetration apparatus
The needle is adjusted to make contact with the surface of the sample
The dial reading is adjusted to zero. Is adjusted.

Technical Specification:-
Dial’s Diameter 116mm & Height of Penetrometer 590 mm
About 150 gm. of air dried soil from thoroughly mixed portion of material passing 425 micron IS sieve is obtained.
Distilled water is mixed to the soil thus obtained in a mixing disc to form a uniform paste.
Then the wet soil paste is transferred to the cylindrical cup of cone penetrometer apparatus, ensuring that no air is trapped in this process.
Finally the wet soil is leveled up to the top of the cup and placed on the base of the cone penetrometer apparatus.
The penetrometer is so adjusted that the cone point just touches the surface of the soil paste in the cup and the initial ready is to be taken.
The vertical clamp is then released allowing the cone to penetrate into soil paste under its own weight for 5 seconds. After 5 seconds the penetration of the cone is noted to the nearest millimeter.
The test is repeated at least to have four sets of values of penetration in the range of 14 to 28 mm.
The exact moisture content of each trial is determined.

Accessories:-
Needle
Container
Water bath
Transfer dish
Thermometer
Time device

Optional Accessories:-
Spare Penetration Needle (Pack of two)
Spare Penetration solid cone
Spare Penetration brass hollow cone
Grease worker hand operated
Grease worker hand operated big handle (Lever type)
Grease cutter