Study On Key Techniques For Construction Of Flexible Base Asphalt Pavement In The Seasonal Frozen Region

In recent years, highway construction is the rapid development of many early diseaseproblems for semi-rigid asphalt pavement reflective cracking, rutting, flexible asphaltpavement is to get more attention. Graded gravel as one of the flexible base material type,more and more used in highway, but graded gravel materials and construction technologylevel difference of each region, a serious impact on the use of graded gravel performance, thispaper construction for flexible asphalt pavement in the northeast cold areas the status quo, athorough and systematic manner to carry out graded crushed stone flexible base constructiontechnology and construction quality control technology, graded crushed stone flexible base inthe promotion of seasonal frozen zone Applications technological foundation.Firstly, starting from the research and analysis of a flexible base application status athome and abroad and the level of construction technology, considering the seasonal frozenarea traffic and other factors of climate and environment, combined with the actual situation,graded gravel compaction conditions for local materials and construction techniques Thetheory and construction process of the system. In this thesis, the introduction of the granularkinetic theory, in-depth study of the material structure, composition and characteristics ofloose gravel with isolated grade. Compaction mechanism of the graded gravel in the idealstate is analyzed theoretically, and through the test to simulate the graded gravel compactionin a broken state, which made the construction parameters of graded gravel vibratorycompaction. At home and abroad a large number of compaction theoretical basis to explainthe mechanism of vibratory compaction, vibratory roller model and the simulation based onthe vibration on the compaction mechanism of graded gravel materials and machinery to thetwo construction parameters. Indoor test different molding methods, physical and mechanicalbehavior of level with gravel, to determine the vibration compacted graded gravel maximumdry density, CBR index to determine the graded gravel suitable local materials frequency ofvibration. The comparative analysis of the dry density obtained in the two molding methodson-site degree of compaction, vibration compaction degree of compaction standard. Throughthe study of traditional on-site detection of the degree of compaction method, the target rate ofsolid volume control graded gravel compaction effect, and given its detection principle andon-site detection methods.This paper combines the high-speed physical works of Tong Dan, from the technicalperformance of raw materials, mixing of the mixture, transportation, paving, rolling processthrough the three structures of the test road paving, the construction of graded aggregates in seasonal frost regions The process carried out a systematic study. According to local climaticconditions, combined with the level of production of the local stockyard seasonal frozen rawmaterials, technical requirements, and for the region’s rolling technology. Construction qualitycontrol, from a number of indicators of raw materials, size distribution, moisture content,degree of compaction, solid volume rate, the CBR, resilient modulus amount to strict control,and thus the construction of key technologies for the quarter frozen area graded gravel thesystem for the promotion and full implementation of flexible asphalt pavement is frozen zoneduring the quarter to provide technical guidance and Construction Guide...