Study on the extraction of corn straw cellulose and its effect on asphalt performance
As an important part of straw,cellulose is the key to determine its mechanical strength.If applied to asphalt pavement,it is expected to improve the performance of the pavement and solve the problems of straw degradation and aging in the pavement.Firstly,the central composite design-response surface method was used to explore the influence of the extraction process of cellulose in straw on the performance of asphalt,and the op-timum extraction process of cellulose was determined.Secondly,the effects of cellulose on high temperature stability,low temperature crack resistance and storage stability of asphalt were studied by rheological property test,segregation test and infrared spectrum test.The results show that the cellulose extracted under the condi-tion of NaOH concentration of 2.5％and HNO3 concentration of 4.3％has the best effect on improving the physical properties of asphalt.At the same time,the incorporation of corn straw cellulose improves the high temperature stability,low temperature crack resistance and deformation resistance of asphalt under high-speed vehicle load shear.When the content of corn straw cellulose is 7％,the comprehensive performance of asphalt is the best,and there is no serious segregation phenomenon.Compared with matrix asphalt,the high temperature continuous grading temperature(TLH)of cellulose content at 7％is increased by 13 ℃,and the low tempera-ture performance is increased by 49.3％.In addition,cellulose only bonded with each other by physical enhance-ment to improve the performance of asphalt,and no chemical reaction occurred.
road engineeringextraction of cellulosemodified asphaltrheological propertiesinfrared spectrum
万方数据
维普
