Research on Structural Characteristic and Component Design Methods for Semi-rigid Base Course Material
|Course||Road and Railway Engineering|
|Keywords||Semi-rigid material Vibratory compaction method Shrinkage performance test methods Erosion performance test methods Suspended dense structure Skeleton dense structure Skeleton pore structure Strength Modulus Temperature shrinkage coefficient Shrinkage coefficient Erosion Mixture Design Method|
This paper carried out with inorganic binder stabilized granular base materials related to soil test method. Developed to better simulate actual working conditions vibratory compactor vibratory compactor room through vibration test and the reasonable parameter configuration, the feasible \'; improved semi-rigid material contraction coefficient measurement system, proposed a \right mix of the Influence of erosion, scour developed road materials testing machine, and that \Paper in accordance with the coarse aggregate in the semi-rigid base materials distribution structure will be divided into three types: Suspended dense structure, skeleton skeleton dense structure and pore structure. Suspended dense structure mixes the material requirements, aggregate gradation can be determined with reference to the prevailing norms, but the skeleton framework dense structure and pore structure of the material aggregate gradation not be referenced. In this paper studied through experiments skeleton skeleton dense structure and pore structure of semi-rigid material in the coarse aggregate skeleton porosity, fragmentation, local shear stress and strain properties of coarse aggregate gradation provides the basis for the determination and On this basis gives a fine aggregate gradation range. In addition, the skeleton dense structures were given cement gravel, crushed stone and cement pore structure skeleton skeleton dense structure of lime Mixture ratio is calculated for each material. In this article, through trial usage of different binder suspension closed cement gravel, cement gravel skeleton dense structure, framework pore structure of cement gravel, suspended dense structure of lime and skeleton dense structures made of lime road performance comparison test. Tests include: compressive strength, splitting tensile strength, flexural strength, compression modulus, flexural modulus of resilience, determination of temperature shrinkage coefficient, shrinkage coefficient determination and anti-erosion performance. Through trial and a summary of previous data, reached a different structure types of cement stabilized crushed stone, two ash stabilized aggregate performance variation and range of values ??of each indicator. Based on the actual use of the process, semi-rigid base pavement performance affected by temperature and humidity changes, and vehicle load and other factors, according to the above findings, presented in strength, shrinkage coefficient and erosion control and other indicators integrated semi-rigid material composed of design methods. In order to meet different needs, the material composition design system, including the choice of method and the test method, in which the method is mainly used for the use of semi-rigid material, and test rules for use of new materials. The first chapter of this thesis, describes the research significance, status and research content and research programs. Second, third and fourth chapters respectively semi-rigid material vibratory compaction test method, the contraction coefficient determination methods and anti-erosion test methods have been studied in the fifth chapter of the main structure for different types of semi-rigid material gradation composition and the corresponding calculation method is used. Chapter VI, respectively, of different structural types of cement gravel, two gray gravel road performance tests conducted studies to summarize the law. Chapter VII focuses on the structure of semi-rigid material types on road performance impact mechanism. Eighth chapter provides physical test road construction process engineering and testing conditions. Binding studies in earlier chapters, in the ninth chapter proposes a multi- Indicators controlled semi-rigid material composed of design methods. In the tenth chapter summarizes the main conclusions of research papers and raised the need for further research.