Mastic Asphalt Hardness Tester:
Hardness tester for Mastic Asphalt has been fabricated to meet the essential requirements od IS 1195 - 1968 in finding out the Hardness Number of mastic asphalt.
Hardness Number is defined as the figure denoting the depth in hundreds of a centimeter, to which a flat ended indentation pin in the form of a steel rod 6.35 mm in diameter will penetrate the mastic under a load of 31.7 kg applied for 60 seconds, the temperature being maintained at 35' +/- 0.5' C or 45' +/- 0.5' C.
DESCRIPTION & SPECIFICATIONS:
The apparatus consists of a frame supported by means of four leveling screws. On the top plate ,a lever with a counter balances weight and a load hanger is fixed .The ration of the lever to weight is such that when the weight is kept on the hanger ,the ultimate load acting on the penetration pin is 31 kg. A thermometer is fixed by a clip, which records the temperature of the water in the container.