HIGHWAY MATERIALS

HIGHWAY AND TRAFFIC ENGINEERING PCI4I102 Department of Civil Engineering, GCEK, Bhawanipatna Asst. Prof. S. Sahoo Page 1 HIGHWAY MATERIALS Introduction There are different highway materials, viz, soil, stone, bitumen, concrete. Each material has defined desirable properties for the purpose for which it is used. The desirable properties of soil as a highway material are: • Short and long term stability of the subgrade and slopes of embankment. • Compressibility within permissible limits. • Adequate permeability • Compaction should be ease and economical • Minimum volume change at all conditions. Subgrade soil Subgrade soil is an integral part of the road pavement structure which directly receives the traffic load from the pavement layers. The subgrade soil and its properties are important in the design of pavement structure. The main function of the subgrade is to give adequate support to the pavement and for this the subgrade should possess sufficient stability under adverse climate and loading conditions. The formation of waves, corrugations, rutting and shoving in black top pavements and the phenomena of pumping, blowing and consequent cracking of cement concrete pavements are generally attributed due to the poor subgrade conditions. Desirable Properties The desirable properties of soil as a highway material are • Stability • Incompressibility • Permanency of strength • Minimum changes in volume and stability under adverse conditions of weather and ground water • Good drainage • Ease of compaction The soil should possess adequate stability or resistance to permanent deformation under loads, and should possess resistance to weathering, thus retaining the desired subgrade support.

HIGHWAY MATERIALS

Documents

bituminous materials

asphalt

concrete

construction

aggregate

pavement structure

subgrade soil