Study On Physical And Mechanical Properties Of Sticky Rice Lime-Soil Under Different Curing Conditions

With time changes,the Chinese excellent traditional culture,which is not only in words,but also in the form of different historical and cultural heritage,shows its unique charm to the world.As an important part of Chinese historical and cultural heritage,earthen sites such as the ancient cities,the Great Wall,the beacon tower bear the level of human cognition in society,nature,technology and culture,they have an irreplaceable uniqueness and the value of permanent retention.However,limited to some physical and mechanical properties of the material itself,these earthen sites have developed a large number of diseases under the background of the climate change and human element.If we keep ignoring these influence and doing nothing,the destruction of these earthen sites will become more and more serious.This paper first reviewed the research and application status about the earthen site protection,sticky rice-lime mortar and lime-soil.After summarizing the previous research results,an idea about researching the physical and mechanical properties of sticky rice lime soil under different curing conditions just come out.In addition to some basic geotechnical tests,the mix and curing condition design,this paper also did the following several aspects of the work and got the corresponding conclusions :(1)In order to determine whether the sticky rice and curing conditions could improve the physical properties of the lime-soil,the water holding capacity,water absorption,permeability and surface hardness of the different types of samples were tested when these samples have been maintained for a certain period of time in indoor,outdoor,constant temperature and dry-wet cycles environment.The result shows that 2% sticky rice concentration and constant temperature are helpful to improve the hydrophobility of lime-soil;the sticky rice can improve the compactness of lime-soil,moreover,permeability of lime-soil will not be changed obviously;surface hardness of the samples is mainly determined by the lime,the sticky rice's effect is small.(2)After maintaining a certain period of time in four different environments,compressive and shear strength of different types of samples were tested for getting their mechanical properties,and the results show that the compressive and shear strength of samples which reinforced by sticky rice are improved in different degrees.Under different curing conditions,the lime-soil reinforced by 2% consistence sticky rice show excellent compressive and shear properties.The compressive and shear strength of the same ration samples have different response to curing conditions.However,compared with other curing conditions,the environment with constant temperature is more conducive to improve the samples' compressive and shear strength.(3)Furthermore,the relevant weatherability test was carried out.The results all show that 2% consistence sticky rice and the curing condition with constant temperature are more favorable to improve the water immersion stability,free thaw stability and hydrolytic stability of samples.After the coupling effect of hydrolyzed,freezing and thawing and salinized,the compressive strength of the reinforced samples is not reduced,but increased,especially after the hydrolytic cycles,and that is contrary to the experimental expectation.After freezing-thawing and hydrolytic cycles,the early curing conditions' effect on the compressive strength of the samples is mainly manifested in the variation tendency when the consistence of sticky rice is changed.In addition to the constant temperature curing condition,the influence of the early curing environment on the compressive strength of the sample is weakened after the freezing-thawing cycles,while it's amplified after the hydrolytic cycles.