Roads play an important role in the development of any
land, always maintain a smooth and good appearance of the roads. Concrete roads
are therefore constructed, although they are expensive as compared to the other
roads. Concrete roads are of two types. Plain concrete and reinforced concrete
roads. However, plain concrete roads are widely used.
Working procedure for plain concrete road.
- Material required is the same as that of other concrete works.
- Concrete road slab is constructed between side forms.
- These forms are made of mild steel channel sections of 3 m length.
- Depth of form is equal to the thickness of the concrete pavement.
- Forms are properly braced and fixed to the ground with stacks every 3 m.
- Batching of material, mixing, transporting of concrete, compaction, curing is to be adopted.
- Concreting should be done in strips or in bays.
- Bays allow sufficient time for concrete to set and take up their initial contraction, before intermediate bays are constructed.
- Longitudinal and transvers joints are provided between the slabs, to allow thermal expansion, contraction and warping of road slab, due to temperature variation.
- Concrete road should be cured for 28 days by ponding method.
Tremix concreting for road
- Here, the extra amount of water present in the concrete is extracted to minimize the water-cement ratio.
- This is done with a vacuum pump.
- After placing concrete, the filter sheet is spread on the concrete road and extra water present on the sheet is extracted by a vacuum pump.
