Longjing High-speed Vibration Mixing Cement Stabilized Macadam Performance And Application Research

In the construction and development of asphalt pavement bases in China,China’s roads mostly are adopted semi-rigid base layers,and the problem that cement stabilized macadam bases are easy to crack has not been solved.In response to this problem,this paper relies on adding vibration mixing during the traditional mixing process of cement stabilized macadam,when the author worked on the physical engineering of Guangxi Longjing Expressway and studies the performance and engineering application of vibration-mixed cement stabilized macadam.Through the indoor test,the cement stabilized macadam base layer was designed with the mixture ratio,and the suitable gradation curve was formulated within the standard grading range;the cement stabilized macadam mixture cement dosage of Longjing Expressway under different mixing modes was determined.And the unconfined compressive test,splitting test,bending test,dry shrinkage test and temperature shrinkage test acted on cement stabilized macadam with different cement dosage and different curing age.According to the data got from these tests,different mechanical properties were compared and analyzed.With the effect of shrinkage performance,the results show that under the same cement dosage and age,vibration stirring enjoyed the advantages over the key technical indicators of traditional mixing,including unconfined compressive strength increased by 11.2%and splitting strength increased by 17.3%,the bending strength increased by 18.3%,the dry shrinkage factor decreased by 19.6%,and the temperature shrinkage factor decreased by 11.7%.The test sections L1 and L2 of cement stabilized macadam base produced by different mixing methods are paved;the quality control points of cement stabilized macadam base are proposed;and the test section is tested,including:compaction,strength,deflection,thickness,flatness,core sampling,crack observation,etc.,to further verify the results of laboratory experiments.The vibration stirring technology is applied to the cement stabilized macadam base layer,which can effectively enhance its key performance,reduce the amount of cement and save the cost of construction.It offers better prospects for application in the future.The research results of the paper can be used as reference and guidance for similar projects in China.