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Compaction Temperature's Influence on the Pavement Performance of Warm Asphalt Mix with Different Matrix

Warm mix asphalt (WMA) is a new type of asphalt mixture that uses a special additive to reduce mixing temperature and compaction temperature to realize energy saving and environmental protection purpose. Laboratory tests are conducted to study that, at different compaction temperatures, the air void rate, dynamic stability and change rule of flexural-tensile strain of the Sasobit WMA of 3 matrix asphalts (Liaohe70#, Liaohe90#, Karamay90#). The results show that when compaction temperature rises, air void rate decreases and the degree of decrease turns slow. At the same temperature, WMA of Karamay90# added with 3% of Sasobit (K90S) has the least air void rate. Along with the rising of the compaction temperature, dynamic stability increases in linearity. At the same temperature, WMA of Liaohe90# added with 3% of Sasobit (L90S) has the best dynamic stability. 115°C is the optimal compaction temperature for L70S and K90S to keep relatively high flexural-tensile strain. At the same compaction temperature, difference of flexural-tensile strain is small among 3 matrix asphalts.