Performance of Warm-mix Rubber Asphalt with Different Preparation Processes
In order to study the different properties of warm-mix rubber asphalt with different preparation processes,the best preparation process of warm-mix rubber is analyzed.Three kinds of warm-mix rubber asphalt with different preparation techniques are prepared respectively,including preparing rubber asphalt first and then mixing with warm-mix agent.Warm-mix agent and rubber particles are mixed firstly,and then warm-mix rubber asphalt is prepared.Warm-mix agent is added in the process of preparing rubber asphalt.By conducting needle penetration test,softening point test,rheological test and infrared spectrum test of warm-mix rubber asphalt with different preparation processes,the differences of needle penetration,softening point,rutting factor,phase angle,fatigue factor,stiffness modulus and chemical composition of warm-mix rubber asphalt with different preparation processes are analyzed,and the effect of warm-mix agent and different preparation processes on the properties of rubber asphalt are studied.At the same time,the asphalt mixture specimens are formed by using warm-mix rubber asphalt with different preparation techniques.The suitable compaction temperature and road performance of warm-mix rubber asphalt mixture are studied,including high temperature stability,low temperature crack resistance and water stability.The result shows that(1)blending in warm-mix agent will increase the penetration,decrease the softening point,and decrease the rutting resistance,but it will not affect the low temperature crack resistance and fatigue resistance of rubber asphalt;(2)the warm-mix agent can reduce the compaction temperature of the mixture effectively,and will not affect the low temperature crack resistance and water stability,but it will lead to the decline of the rutting resistance of the mixture;(3)the preparation process of blending in warm-mix agent and rubber particles in advance can increase the fusion effect of rubber particles and asphalt,minimize the influence of warm-mix agent on the rutting resistance of rubber asphalt,and reduce the production temperature of rubber asphalt and rubber asphalt mixture,obviously having advantages among 3 different preparation processes.
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