Preparation And Properties Of Fiber Reinforced Mycelium Composites

Traditional building materials have large energy consumption,large resource consumption,and are not sustainable,which seriously affects the ecological environment.At the same time,agricultural waste has not been properly used.In this context,a new type of mycelium composite material came into being.The composite material uses sand and soil as the skeleton and is wrapped and wound by mycelium.It is not only expected to replace traditional building materials,but also provides a new solution for agricultural waste.Based on this,this paper designs the forming scheme of mycelium / sand composite material and mycelium / soil composite material,studies the water absorption performance,mechanical properties,microscopic analysis and other properties of the specimen,and studies the performance of fiberreinforced mycelium composite material.(1)The test design of the mycelium composite material was carried out.Through the design of single factor test,the most suitable material distribution was determined,and a scheme for shortening the time of forming the specimen was obtained.The optimal design scheme was that the mass ratio of aggregate to sawdust was set to 1 :3,paste starch was added,and glucose was added.The advantage of this scheme is that the specimen is formed quickly and it is not easy to produce bacteria.(2)For fiber selection,basalt fiber and polypropylene fiber are selected as reinforcing fibers among many fibers,which are divided into two forms : chopped and crushed.The chopped fiber is more prone to agglomeration than the chopped fiber,and the chopped fiber is superior to the chopped fiber in strength,but the chopped fiber can produce greater deformation under the same force.(3)The apparent characteristics of mycelium composites were studied.The density of mycelium / sand composites and mycelium / soil composites was higher than that of pure mycelium composites,and the density of materials increased with the increase of aggregate ratio.However,the density of mycelium / soil composites decreased after adding reinforcing fibers.(4)Observe the quality change of the mycelium / sand composite material,and observe the three stages of production,before inactivation and after inactivation.The test shows that the overall quality change trend of the specimen is first increased and then decreased.(5)The compression test of mycelium / sand composites was carried out.It was found that the addition of basalt fiber and polypropylene fiber could improve the strength of the composites,and the crushed basalt fiber could exert better compressive properties under larger force.The deformation of polypropylene fiber mixed with crushed is the largest under the same force.The use of sand with smaller particle size can make the specimen bear the maximum bearing capacity under the same deformation.When the skeleton particle size of the specimen is small,basalt fiber is preferred as a reinforcing fiber to obtain better mechanical properties.When the skeleton particle size of the specimen is large,polypropylene fiber can be preferred as a reinforcing fiber to obtain better mechanical properties.(6)The compressive test of the mycelium / soil composite material was carried out.The strength of the composite material with chopped basalt fiber was significantly improved,but the compressive strength and failure load of the composite material with chopped polypropylene fiber and crushed fiber decreased.(7)Microscopic observation of the specimens shows that the mycelium composite material is the mycelium winding and wrapping the aggregate to form the whole specimen,and at the same time,the mycelium fiber is occluded at the pits on the surface of gravel and soil particles.The mycelium also invades the pores on the surface of the culture material,decomposes the culture material to obtain nutrients,and the undecomposed culture material forms the skeleton of the composite material with aggregates such as sand or soil.