Effect of Modified Nano Silica on Performance of Thermal Insulation Plastic Concrete
Nano silica(SiO2)was modified by silane coupling agent KH550,and SiO2 before and after modification was used as filler to prepare silica/polypropylene(SiO2/PP)plastic concrete material.The microstructure of nano silica before and after modification was observed by a scanning electron microscopy,and the effect of SiO2 dosage on the workability,thermal conductivity,and durability of plastic concrete was studied.The results show that with the mass fraction of filler increases,the flowability of the sample gradually decreases,the working performance gradually deteriorates,the thermal conductivity of the material gradually increases,the heat is lost through the pores,and the insulation performance gradually decreases,but still meets the relevant standard requirements.When the mass fraction of modified silica(M-SiO2)is 3%,the plastic concrete has the highest compressive strength,reaching 5.66 MPa,and also exhibits superior durability.After 50 times of sulfate resistance test,the compressive strength only decreases by 9.54%.Therefore,the plastic concrete added 3%M-SiO2 has good thermal insulation performance.
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