The Physical And Mechanical Performance Of Porous Earth Materials Integrated Bearing And Thermal Insulation Property

In view of the double pressure of resources and environment,at the same time,in order to further explore and discover green ecological construction experience,containing in the traditional local-style dwelling houses of Chinese,people begin to re-examine the ancient building material of immature soil,and find that immature soil is energy saving,environmental protection and green building materials.Through organic,inorganic or physical modification and composite modification,raw soil material can produce the raw soil material which mechanical properties and water resistance meet the requirements,while,the heat preservation performance tends to weaken.To make up for the negative impact of different strengthening measures on the raw soil material's heat preservation performance,by introducing tiny little pores to adjust the forming of the raw soil material's pore,or joining microporous coarse aggregate,such as: ceramsite,perlite,to change the whole of raw soil material's microstructure and pore structure and improve the heat preservation and heat insulation performance of raw soil materials.This topic research not only can provide a new energy-saving and with composite function's wall materials for the rural residential construction,but also can make traditional raw soil buildings with a long history get a new life.Taking raw soil as raw material,and adjusting water solid ratio,the topic through the plant fiber and inorganic gelled material,modified raw soil material's mechanical properties,and add ceramsite to reduce the raw soil material's coefficient of thermal conductivity,thus prepare insulation bearing integration of raw soil material.The following major progress in research work:(1)By changing the dosage of the mixing water,research the impact of water solid ratio on the raw soil material's mechanical properties,and observe the mixture's workability.The results show that when the water solid ratio is 0.22,both compressive and flexural strength of the raw soil block are highest,and with good workability.(2)For physical modification on raw soil material,mixed with three different dosage of plant fiber,such as jute fiber,sugar cane fibre and coir fibre,to improve the mechanical properties of raw soil.The results show that the impact of three kinds of plant fiber on improving the raw soil material's compressive strength is not obvious,but it can greatly improve the flexural strength of raw soil material.Among of them,the improving function of the jute fiber is especially significant.(3)On the basis of physical modification,to inorganic modified raw soil material,through adding ordinary Portland cement,aluminate cement,sulfate aluminate cement these three kinds of inorganic gelled material,changing the content,studying its effect on mechanical properties of the raw soil material.The results show that the ordinary Portland cement improves the mechanical properties of the raw soil material significantly.when dosage is 16%,raw soil block's compressive strength is 8.2 MPa,and the flexural strength is 4.0 MPa,which meet the strength requirement.(4)Studies have shown that although the modified raw soil material can improve the mechanical properties of raw soil material,and improves the raw soil material's coefficient of thermal conductivity,which leads to its heat preservation performance decrease.(5)Based on the modified raw soil material,adding the haydite shale ceramsite,clay and lytag,to research different kinds and dosage of ceramsite's influence on raw soil material's thermal performance.Results show that the raw soil material's coefficient of thermal conductivity becomes decrease,with the increase of ceramsite's dosage,and Clay ceramsite can improve the insulation performance of raw soil significantly.When the dosage is 24%,generates block 's strength and thermal insulation performance can meet the requirements.