Heavy loads creates deflection on the road surface, with insufficient underlying strength. The thickness of compacted asphalt concrete pavement ranges from 2 inch for lightly traveled road to 6inch or more for roads where traffic is considerably heavy. The purpose is to bind any loose particles of the base and likewise act as bond between the base and the pavement to deter rising moisture from penetrating the pavement. A prime coat is first applied and treated base before asphalt concrete is laid. Highest type of dense bituminous pavement concrete suitable for the most heavily traveled roads. Term asphalt concrete refers to a dense graded road surface made of hot mineral aggregates, mixed with hot asphalt and laid at high temperature with about 275 degree farenheight to 300 degree farenheit.
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This process is referred to as the penetration method. Cover the sprayed pavement with fine aggregates. Spread and compact the clean crushed stones, sprayed with heated or emulsified asphalt binder over it. The mixture is laid and compacted at the normal temperature before the solvent evaporates or the emulsion breaks. Mixing liquid or emulsion asphalt with aggregates at normal temperature is either by plant or road mixing. The mixture is then laid and compacted while still hot. Viscous asphalt binder is heated to a fluid condition and mixed with heated aggregates. Ī satisfactory asphalt pavement could be attained under the following construction procedures: On the contrary, pavement failure would be considered as a forgone conclusion. The success of an asphalt pavement lies or depends of the construction quality of the sub-grade, and the base course.
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It must be resistant to internal moisture such as water vapor It must posses a tight or porous impermeable surfaces the case may be suitable to underlying base on sub-base It must be smooth riding and skid free surface Qualities of asphalt road The surface must free from cracks or raveling due to shrinkage and fatigue failure It must withstand weather condition, including the effect of surface water, heat, cold and oxidation Asphalt macadam Asphaltic concrete Mastic National paving Plant mix Asphalt sheet Road mix Armor coat Oil mat, etc. The mixture of rock material particles with asphalt has created so many names such as: BITUMINOUS PAVEMENT
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The bituminous pavement is a combination of mineral aggregate and bituminous binders. HIGHWAY ENGINEERING AND TRAFFIC ENGINEERING CENG 95