The Research On Compaction Standard And Large Thickness Base Of Cement Stabilizated Crushed Stone

Along with the development of China's highway construction , semi-rigid base have a wide range of promotion and application, such as cement, lime and fly ash granular material which with the high strength, capacity and water stability. There are three methods to determine compaction control indicators of the construction of semi-rigid base: heavy duty compaction, vibrating compaction and vibrating roller. It is therefore necessary to discuss and compare the difference among them to obtain the optimum compaction methods and indicators based on the actual situation of construction to guide compaction works.At present, The thickness of cement stabilization crushed stone semi-rigid base is generally between 25 ~ 36 cm, in the process of actual construction, it usually been divided into two layers to spread and compact. The problem that compaction construction with layers brings about has mainly: (1)the monolithic is bad; (2)the work period is long; (3) the base is easy to loss in early phase; (4) increases construction costs; (5)the cracking of the up-base and sub-base will mutual reflect. Therefore, be necessary carrying out the technology of the cement stabilization crushed stone large thickness integral rolling studying.This paper summarizes the density forming principle of cement stabilization crushed stone at first, analyzes the effects of vibration parameters, the composition of the material and compacted thickness (full size test) on compaction results, contrasts three major methods (heavy duty compaction, vibrating compaction and vibrating roller) which were identified by the current standard of cement stabilization crushed stone compaction, and described the characteristics of them. By describing China's current construction of cement stabilization crushed stone base, analyzes the lack of layered construction, and checking the possibility of large thickness integral construction by the site test road.