2.5 m

3.5 m

4.5 m

5.5m

0

25 mm

50 mm

100 mm

relieve warping stresses

relieve shrinkage stresses

resist stresses due to expansion

allow free expansion

climatic condition

type and intensity of traffic

subgrade soil and drainage conditions

availability of funds for the construction project

granular soil

organic soil

silts

clays