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Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

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DETERMINATION OF TEMPERATURE OF BINDER<br />

113<br />

<strong>Quality</strong> <strong>Assurance</strong> <strong>Handbook</strong> <strong>for</strong> <strong>Rural</strong> <strong>Roads</strong><br />

ANNEX- I<br />

The temperature of bituminous binder shall be determined with the help of a calibrated metallic contact<br />

thermometer with digital (LCD/LED) display. The range of thermometer <strong>for</strong> different types of<br />

bituminous material and their accuracy shall be as under:<br />

(1) Melted Bitumen : ambient to 200 o C accuracy + 1 o C<br />

(2) Cutback bitumen : ambient to 100 o C accuracy + 0.5 o C<br />

(3) Bitumen emulsion : ambient to 80 o C accuracy + 0.5 o C<br />

RATE OF SPREAD OF BINDER IN SURFACE DRESSING<br />

AND MODIFIED PENETRATION MACADAM<br />

ANNEX- II<br />

Light metal trays of 200 mm x 200 mm and 30 mm depth are weighed and numbered. These are placed<br />

at intervals along the road in the path of bitumen distributor between the wheel tracks. After the<br />

distributor has passed over, the trays are removed and wrapped in weight sheets of paper so that they<br />

can be handed, stocked and weighed as soon as convenient. The spacing and the number of trays can<br />

be varied to suit the particular conditions at the construction site, but at least five trays should normally<br />

be used. The tray test gives a measure of variation in rate of spread of bitumen along the road and a<br />

good approximation to the average rate of spread of bitumen.<br />

The trays are weighted correct to first place of decimal. The maximum longitudinal distribution error in<br />

rate of spread of bitumen should be within +10 per cent of the specified rate of spread of bitumen.<br />

Similarly transverse distribution of bitumen can be checked by placing a number of trays to collect<br />

bitumen sprayed over each 50 mm width of spray bar. The variation in transverse distribution should<br />

be within + 20 per cent from the mean. The extreme 150 mm width at either side of the sprayed area<br />

need not be taken into account.

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