Research and Mechanism Analysis on Improving the Performance of Granite Asphalt Mixture

Granite is widely distributed in coastal areas of China, but granite, as an acid stone, can not be used directly in asphalt mixture. Combined with the climatic conditions in coastal areas, we can prepare materials for local projects, save engineering costs, and prepare composite modified asphalt. The 5% nano-calcium carbonate and the 5% rock asphalt are added to prepare modified asphalt. The results indicate that the adhesion level between granite and asphalt is increased to 4th grade. The dynamic stability is increased to 3652 times/mm. The residual stability is increased to 91%. The high temperature and water stability of the modified asphalt mixture are increased, and the modification mechanism is researched with the chemical composition of the modifier.