LECTURE NO. 17 (Handout) PAVEMENTS AND BITUMINOUS MATERIALS. Objectives: To introduce types of pavements To explain various bituminous materials, emphasizing asphalts To explain properties of asphalts. PAVEMENT: Definition.
Pavement is defined as a road or highway with hard, smooth, and leveled surface made using a suitable material such as Portland cement concrete or asphalt concrete
Asphalt concrete pavement
Portland cement concrete pavement
Load distribution under a flexible pavement
Stress at lower depth is higher than the stress at higher depth
Load distribution under a rigid pavement
Typical rigid pavement cross-section
Emulsified asphalts are increasingly being used in lieu of cutback asphalts for the following reasons:
Asphalt cements have an upper limit on penetration value of 300 (i.e., 30 mm)
Softening point can simply be defined as the temperature at which asphalt cement cannot support the weight of a steel ball and starts flowing.
Durability of pavement is adversely affected by aging