Hello there,
How have you been? Here is another round of one liners for your preparation for the GATE and PSUs examinations.
How have you been? Here is another round of one liners for your preparation for the GATE and PSUs examinations.
- The aggregates required for one kilometers length of water bound macadam road per meter width and for 10 mm thickness is 12 cubic meter.
- The camber of shoulders in water bound macadam roads is equal to the cross slope of pavement.
- The binder normally used in flexible pavement construction is bitumen.
- In highway construction rolling starts from sides and proceeds to center.
- For the construction of water bound macadam roads, the correct sequence of operations after spreading coarse aggregates is dry rolling, application of screening, wet rolling and application of filler.
- For the penetration macadam construction, the bitumen is sprayed after the aggregates are spread and compacted.
- When bituminous surfacing is done on already existing black top road or over existing cement concrete road, the type of treatment to be given is tack coat.
- A bituminous primer is a high viscosity cut-back.
- The suitable surfacing material for a bridge deck slab is mastic asphalt.
- The thickness of bituminous carpet varies from 20 to 25 mm.
- Sheet asphalt is a sand-bitumen mix without coarse aggregates.
- In highway construction on super-elevated curves, the rolling shall proceed from lower edge towards the upper edge.
- Expansion joints in cement concrete pavements are provided at an interval of 18 m to 21 m.
- Contraction joints are spaced closer than the expansion joints.
- Longitudinal joints are provided in cement concrete roads to prevent longitudinal cracking.
- Warping joints are provided to relieve stresses induced due to warping.
- A hill road is one which passes through a terrain with a cross slope of 25 to 60%.
- In hill roads if several alternate alignments are surveyed which fulfill the geometric standards, then the preferred alignment is the one which has resisting length as minimum.
- The camber is hill roads in case of bituminous surfacing is adopted as 2.5%.
- The super-elevation to be provided in horizontal curves of radius R in hill roads is V^2/(225R).
- The minimum design speed for hairpin bends in hill roads is taken as 20 kmph.
- The drain which is provided parallel to the roadway to intercept and divert the water from hill slopes is known as catch-water drain.
- The walls which are necessary on the hill side of roadway where earth has to be retained from slipping is known as breast wall.
- In hill roads the side drains are provided only on the hill side of the roads.
- Emulsions are used for stabilizing desert sand.
- Soil lime stabilization is very effective for stabilizing black cotton soils.
- Soil lime stabilization is quite effective in warm regions.
Check the reference book:
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