Test: Pavement Design

For different combinations such as day/night, summer/winter, vehicle load, different combinations need to be considered on either of interior, edge or corner loading.

Contraction joints are spaced closer than expansion joints. As per IRC specifications, the maximum spacing of contraction joints in unreinforced CC slabs is 4.5 m and in reinforced slabs of thickness 20 cm is 14 m.

Expansion joints are provided to allow for expansion of the slabs due to rise in slab temperature. The approximate gap width for this type of joints is from 20 to 25 mm.

Clayey Soil Sheepsfoot Roller Vibrator Sands
Smooth Wheeled Roller Finishing of gravel and sand Pneumatic Tyred Rollers Coarse grained soils with some fines.

Modulus of subgrade reaction (k) is calculated from plate bearing test at 0.125 cm settlement
K = Pressure (kg/cm2) / 0.125 cm

Flexible pavements are those, which on the whole have low or negligible flexural strength and are flexible in their structural action under the loads. The flexible pavement layers reflects the deformation of the lower layers on-to the surface of the layer. The flexible pavement layers transmit the vertical or compressive stresses to the lower layers by grain to grain transfer through the points of contact in granular structure.

Contraction Joint is provided to prevent contraction, Usually, steel bars and sealant material is used to form a contraction joint.

Modulus of subgrade reaction (k) is calculated from plate bearing test at 0.125 cm settlement
K = Pressure (kg/cm2) / 0.125 cm