RIGID PAVEMENTRigid pavement: Pavement has certain degree of beam strength that permits them to span or bridge over some minor irregularities in the subgrade or subbase on wich they are are rest.Qualities of concrete pavement
Carry almost unlimited amounts of any type of traffic with ease, comfort and safety.Surfaces are smooth, dust free and skid resistantHigh degree of visibility for both day and nightLow maintenance cost better permanency
Flexural strength of cement concrete = 45 kg/cm2Effective Modulus of subgrade reaction of the DLC sub-base= 8 kg/cm3Spacing of contraction joints= 4.5 mWidth of slab= 3.5 m
Construction of Base/ Sub-base A base/ sub-base to the concrete pavement provides uniform and reasonably firm support,prevents mud-pumping , and acts as capillary cut-off.
As per IRC:15 (2002), sub-base could be of three types with Granular material (for example, brick soling with one layer of sand under it, WBM, well graded granular materials etc.) Stabilized soilSemi-rigid material, (for example, lime burnt clay puzzolana concrete, lime fly-ash concrete, lean cement concrete roller compacted concrete etc.).
Dry lean cement concrete as sub-base The thickness of DLC, generally recommended is 100mm or 150mmThe maximum aggregate to cement ratio is 15:1. The average compressive strength of DLC cubes at 7 days, should not be less than 10 MPa, tested on 5 samples and individual compressive strength should not be less than 7.5 MPa, at 7 days
Joints in Concrete PavementLongitudinal JointWarping JointTransverse JointConstruction JointContraction JointConstruction JointExpansion Joint
JointsContraction jointExpansion jointWarping jointConstruction joint
Types of Rigid PavementsRigid pavements can be classied into four types: Jointed plain concrete pavement (JPCP), Jointed reinforced concrete pavement (JRCP), Continuous reinforced concrete pavement (CRCP), and Pre-stressed concrete pavement (PCP).