Highway Engineering
Bitumen of grade 80/100 means

its penetration value is 8 mm
its penetration value is 8 to 10 cm
its penetration value is 10 mm
its penetration value is 8 to 10 mm

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Highway Engineering
For the construction of water bound macadam roads, the correct sequence of operations after spreading coarse aggregates is

dry rolling, application of screening, application of filler and wet rolling
dry rolling, application of screening, wet rolling and application of filler
dry rolling, application of filler, wet rolling and application of screening
dry rolling, wet rolling, application of screening and application of filler

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