Evaluation of Performance and Carbon Emission of Dry-Process Crumb Rubber Large Particle Asphalt Mixture
In order to improve the road performance of large-size permeable asphalt mixture(LSPM),crumb rubber large particle asphalt mixture was prepared by dry process.Firstly,the calculation method of the effective thickness of dry-process crumb rubber asphalt membrane was presented.On this basis,with the help of leakage and dispersion tests,the optimum asphalt content of LSPM-25 was given.Secondly,the effect of crumb rubber content on the performance of asphalt mixture was compared and evaluated by means of wheel rut and permeability test.Finally,by means of Hamburg wheel rut and dynamic modulus test,the influence characteristics of binder types(SBS,MAC and rubber powder)on LSPM-25 mixture were analyzed,and the energy saving and emission reduction of different mixtures were analyzed quantitatively.The results show that the optimum asphalt content is 3.4%and the optimum crumb rubber content is 20%,road performance test results show that crumb rubber-LSPM25 is close to SBS-LSPM25 in high temperature rutting resistance and water stability,and is superior to MAC-LSPM25.However,the dynamic moduli of MAC-LSPM25 and crumb rubber-LSPM25 are higher than that of SBS-LSPM25 as a whole.In the process of prolonging the loading time or heating up,the joints of SBS binder softening or viscosity decreasing appear earlier under the same gradation.In addition,compared with SBS-LSPM25 and MAC-LSPM25 asphalt mixture,the dry-process crumb rubber-LSPM25 shows excellent effect of energy saving and emission reduction.With the calculation of 1 km highway as an example,the carbon emission of MAC-LSPM25 is about 1.12 times that of dry-process crumb rubber,SBS-LSPM25 is about 1.05 times that of dry-process crumb rubber.
dry-process crumb rubbercalculation of the thickness of asphalt membranedifferent bindersroad performancemechanical propertiescarbon emission
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