Highway Engineering
The function of an expansion joint in rigid pavements is to

Relieve warping stresses
Resist stresses due to expansion
Allow free expansion
Relieve shrinkage stresses

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Highway Engineering
In soils having same values of plasticity index, if liquid limit is increased, then

Compressibility, permeability and dry strength decrease
Compressibility and permeability decrease and dry strength increases
Compressibility and permeability increase and dry strength decreases
Compressibility, permeability and dry strength increase

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