Experimental Study on Aging Performance of Nano-CaCO3 Modified Asphalt and Its Mixtures
In order to improve the high temperature stability,low temperature cracking resistance and anti-aging properties of asphalt mixtures,this paper uses calcium carbonate nanoparticles as a modifier for the preparation of modified asphalt,with the degree of penetration,penetration index,kinematic viscosity and other test indicators to determine the optimal amount of calcium carbonate nanoparticles modified asphalt dosing and process parameters,through the thermogravimetric analysis method to research the high temperature stability of the nano-CaCO3 asphalt modified asphalt,aging resistance.By rutting test,semi-circular bending test to explore the road performance of different aging cycles of modified asphalt mixtures.The test results show that the dosage of nano-CaCO3 is 3%,its temperature-sensitive performance is optimal;nano-CaCO3 asphalt high-temperature stability and aging resistance are better than 70#asphalt,and through the road performance test to prove that the different aging cycle of nano-CaCO3 asphalt mixtures with rutting resistance,bending and tensile properties are better than 70#asphalt.
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