Dry method, dry method is the waste powder directly into the asphalt mixture mixing drum mixing, the amount of powder is generally added to the mixture of 2 to 3%, the resulting mixture is called rubber modified asphalt mixture. As the powder only as a filler, the asphalt modification effect can only be reflected by the change in the performance of asphalt mixture, the uniformity of control and modification of the test more difficult, in addition, there are powder loss and environmental pollution and other issues, so use The scope is limited. Wet method, wet method is the first powder in the 160-200 �� hot asphalt mixing, through mechanical energy and thermal energy and chemical methods, so that the degradation of powder to form a stable dispersion of rubber powder modified asphalt, the amount of powder added Generally 15-20% of the asphalt. Wet method, according to the process is divided into swelling method (mainly by physical mixing) and development method (mainly chemical change, there are some physical changes). Rubber powder modified asphalt used in the waste rubber powder. As the waste rubber powder manufacturing process and the source of different waste rubber, finished rubber powder quality, particle shape and surface morphology are quite different, the performance of modified asphalt also have a great impact. asphalt maintenance of tennessee concrete finishing tools power trowel machine shop tools for sale philippines asphalt surface cutting machine