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沥青马蹄脂碎石(SMA)是一种坚韧、稳定、抗车辙的特种沥青混合料。SMA混合料可以使用普通沥青作为粘结剂,也可使用改性沥青,但使用改性沥青后性能更佳。使用改性沥青可使SMA混合料的抗高温车辙和低温裂缝以及抗疲劳性能更加突出,因此改性沥青的SMA混合料使用更为广泛。虽然SMA混合料的拌制工艺类似于常规的普通级配沥青混合料,但由于SMA间断级配粗集料多、矿粉多、细集料少,又加入改性剂和木质纤维,所以是一种较难拌和均匀的混合料,且目前又无专用搅拌设备,同时在施工中,中下层普通
Asphalt Mastic Crushed Stone (SMA) is a tough, stable, anti-rutting special asphalt mixture. SMA mix can be used as a binder ordinary asphalt, but also the use of modified asphalt, but the use of modified asphalt better performance. The use of modified bitumen can make the SMA mixture more resistant to high temperature rutting and low temperature cracking and fatigue resistance, so the modified bitumen SMA mixture is more widely used. Although the SMA mix process is similar to the conventional ordinary grade with asphalt mixture, but because of discontinuous grading with SMA more coarse aggregate, more mineral powder, less fine aggregate, but also add modifier and wood fiber, so is A more difficult to mix the mixture, and there is no special mixing equipment, at the same time in the construction, the middle and lower ordinary