| With the rapid development of China’s economy,industrial building materials such as concrete and steel are widely used,which brings great pressure to the environment,and also affects the protection and inheritance of traditional village culture and the construction of beautiful villages.Traditional villages contain thousands of years of cultural history,ecological landscape and architectural style of the Chinese nation,so the urgency to protect them is increasing.Due to its specific geographical location and cultural environment,there are still a large number of rammed earth buildings and traditional villages widely distributed in Northwest Sichuan.Although rammed earth buildings have significant advantages in regional adaptability,green environmental protection,beauty and livability,etc.,rammed earth materials themselves have problems such as insufficient strength and poor water resistance,and walls made of raw soil materials are prone to cracks and soil shedding after sun and rain.In recent years,the relevant research has made obvious progress,but some problems have not been solved well.Therefore,in view of the defects existing in the current rammed earth building,the research on the modification measures of rammed earth materials is carried out.The main research work and the conclusions are as follows:1)Investigate the rammed earth buildings in the northwest area of Sichuan Province,and carry out the study of soil physical properties.The basic physical property test,mechanical property test and water stability test were carried out from the macro level,and the SEM,XRD and IR tests were carried out from the micro level to understand the characteristics of the soil more comprehensively.2)Experimental study on related properties of modified rammed earth material.In this study,cement,lime,EFS soil stabilizer,polypropylene fiber and plant fiber was used as modified materials to carry out the experimental study of modified rammed earth materials by mixing.Through the compaction test,the optimum moisture content of each ratio scheme was obtained to ensure the compaction degree of the modified specimen.Through the 3d,7d and 28 d compressive strength tests,tensile strength tests and water stability tests of the modified rammed earth specimens,the performance improvement of the soil samples was studied,so as to provide a reference scheme for the optimal modification effect for the practical application.3)Analysis of modification mechanism of modified rammed earth material.The microstructure characteristics of the modified rammed earth materials were obtained by SEM,XRD and IR tests.From the perspective of microstructure,the influence of the change of the content of modified materials on the properties was analyzed.Through the test of microstructure characteristics and the combination of macroscopic experimental phenomena,the modification mechanism was explored in depth.4)The economic analysis of modified rammed earth wall material was carried out in combination with actual engineering.Taking the protection project of rammed earth residential houses in Tielu Village,Mianyang City as an example,this paper analyzes the economic and social benefits of different modified materials,deeply excavates the comprehensive benefits and development prospects of modified rammed earth buildings,and recommends more suitable modified materials and matching schemes. |
