Road Surfaces
Concrete, as well as cement and other Hydraulically Bound Mixtures (HBM) in road construction can provide whole life cost benefits. More recently, use of concrete, including cement bound granular mixtures (CBGM) are reported as contributing to initial cost competitive solutions, and are increasingly specified.
A recent study by Britpave confirms the cost advantages of cementitious solutions.In addition research indicates reduced operational carbon emissions from cementitious solutions.
For residential and industrial roads concrete block paving is also a viable option.
The main specification for road pavements is the Highways Agency Design Manual for Roads and Bridges (DMRB) and Specification for Highway Works (SHW). The current DMRB Pavement Design method is set out in HD26/06 where it is assumed that the pavement is either flexible or rigid.
For flexible areas, the upper layers of pavement are bound in bitumen and the lower layers are either bound in bitumen or with a hydraulic binder. Where the lower layers are hydraulically bound materials the pavement may be designated ‘flexible composite’ or colloquially just as ‘composite’.
Rigid pavement constructions are:
- Continuously Reinforced Concrete Pavement (CRCP), normally with an asphalt overlay of minimum thickness 30mm.
- Continuously Reinforced Concrete Base (CRCB) with an asphalt overlay of 100mm.
- Unreinforced Jointed Concrete (URC).
- Jointed Reinforced Concrete (JRC).
- Other forms of rigid construction are permitted with approval of the Overseeing Organisation.
Pavement design deals with elements as follows:
- Pavement - surface course and binder/base – these are always bound layers
- Foundation - can be constructed from bound or unbound materials
- Formation or Construction Platform - can be existing, unbound, or lightly bound materials.
Source: concretecentre
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