Here in Paving 101 we will be teaching you need to know information about asphalt paving in order to get the most for your money.
• For every inch of asphalt or modified stone base that is laid it will compact approximately ¼ inch (This means if one contractor tells you that he is furnishing/installing 4 inches of material and then compacting/rolling, your total compacted material is 3 inches. Most reputable contractors will say they are furnishing/installing a compacted amount of asphalt or stone.)
• There are three main asphalt mixes
• One mix is 25mm asphalt base course (this mix has the largest stone in it making it the strongest of the three mixes, but it is also the most porous of the three and does not seal the water out)
• The second mix is 19mm asphalt binder which is normally referred to as modified binder( this mix still has fairly large stone making it strong, but also has a lot more smaller fine material added to make it much less porous than 25mm in order to let less water pass through)
• The third is 9.5mm wearing course which doesn’t have much strength because the biggest stone in it is only 9.5mm and it is made up of mostly fine material. This mix is the least porous.
• 25mm is used for the strongest base and should have 9.5mm wearing course overtop of it to keep water from running into it. 19mm is commonly used as a cheaper method of paving up front but should have a wearing course put on eventually to seal the water out better.
• The most important thing for asphalt to last a long time is the stone base.(if the stone base is solid then the asphalt will not flex and crack)
• Salt does not hurt asphalt