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Materials Jan 21, 2017

Asphalt binder

Asphalt binder is play a cementation in asphalt mixture of asphalt-like material (including adding additives, modifiers, etc) in General. Mineral aggregates bonded into a whole, the ability to increase strength and resistance to damage of reinforced pavement and pavement with water resistance.

Aggregate

Aggregates of mineral aggregate in asphalt pavement material is known, skeleton in the pavement materials and fill the role. Sometimes take several types of coarse and fine aggregate mixed the required particle size gradation. In aggregate more than 5 mm in size are called coarse aggregate, 5 mm or less is known as fine aggregate. According to different sources, aggregate can be divided into two large categories of natural and synthetic aggregates of aggregates. Natural aggregates crushed stone, gravel, sand, stone chips and other, artificial aggregate burning bauxite and stable solid of metallurgical slag and other. Asphalt pavement aggregate should be clean and free of mud, of coarse aggregate particles should be close to the cube, edges, small flat Strip, the compressive strength of not less than 60 MPA, lane surface, not less than 80 MPA, and high wear resistance. Aggregates and bituminous material should have good adhesion, Peel easily by water erosion, such as aggregates and bituminous adhesive side should be mixed with effective anti-stripping agent. Set of matching material, Pu cast should be of a similar size, layered with particle size of aggregate the document; mixing mixture size particle size specifications often need to cope with the gradation of aggregate, which aggregates can also be used with different size aggregate mixed in proportion.

Mineral powder

Powder particle size less than 0.074 mm mineral aggregate. For asphalt concrete and asphalt macadam pavement, whose role is to fill the gap, preventing hot asphalt flowed enhanced adhesion and thermal stability of bituminous materials. Mineral powder and the asphalt has the good affinities (adhesion), able to resist water erosion. The most commonly used mineral fines as limestone powder.