HP Bitumen Handbook - Hindustan Petroleum Corporation Limited

Appendix-I : road metals and
materials
proportioned mixture of agrillaceous and calcareous materials with no additions
subsequent to calcination excepting water and calcined or uncalcined gypsum.
QUARRY STONE - Quarry stone is stone that has been mined by blasting or
otherwise from solid rock at quarry site. Usually all faces of such stones are
fractured.
QUARTZITE - A metamorphosed quartz sandstone, formed by deposition of
secondary silica between the original grains, so that the rock is more firmly
cemented and less porous than before and tends to break across the grains.
QUICK LIME - A calcined material, the major part of which is calcium oxide or
calcium oxide in natural association with lesser amount of magnesium oxide,
capable of slaking with water.
RESINS: Resins are dark brown in colour, are solid or semi-solid and are highly
polar in nature. The polar nature of resins imparts strong adhesive properties to
bitumen. Normally, resin accounts for 10 to 20 % of bitumen by weight. Increase
in Resin content hardens the bitumen, reduces penetration index and increases
shear strength & viscosity.
ROAD METAL OR AGGREGATES - Hard granular materials of many types and
sizes used in road construction, i.e., sand, gravel, crushed gravel, crushed rock,
slag, cinder, moorum, kankar, laterite, portland cement clay, limestone dust,
diatomaceous earth, mineral fillers, etc.
ROCK ASPHALT: In France, Switzerland & Italy naturally coated bituminous
aggregate is found at a few places. The natural asphalt in these regions is found
in rocky terrain consisting mainly of calcerous porous rocks like limestone and
sandstone. Over the period of time the asphalt has seeped into the stones and
hence naturally occurring stones coated & impregnated with asphalt are found in
these areas.
SAND - Sand consists of mineral grains varying from about 5 mm to 0.05 mm in
diameter.
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