Research On The Performance Of Carbon Nanotube Electrothermal Concrete For Rural Electric Heating

In pursuing the dual carbon goal,addressing China’s rural winter heating energy consumption is essential.To support the national shift towards clean heating,various regions have initiated the promotion of clean heating methods,such as electric heating,primarily through the installation of electric heating films and cables beneath concrete floors or walls.These methods are influenced by the thermal transfer properties of concrete.Carbon nanotube concrete,a form of electric concrete,directly converts electrical energy into thermal energy.Utilizing this material for constructing floors and walls enables the integration of heating and structural elements.Consequently,this paper examines the performance of carbon nanotube electrothermal concrete.First,the preparation process and methods for carbon nanotube electrothermal concrete test blocks are investigated,and their compressive strength is assessed.Next,the electrical conductivity of the cured test blocks is experimentally explored,followed by an examination and numerical analysis of the electrothermal performance of the carbon nanotube concrete test blocks.Finally,the impact of varying parameters on electrothermal performance is analyzed using ABAQUS numerical simulation.(1)The compressive strength of carbon nanotube electrothermal concrete,resulting from the selection of raw materials and preparation process outlined in this paper,exceeds 40 MPa.This strength satisfies the design requirements and is suitable for engineering applications.Concurrently,it is observed that the impact of carbon nanotubes on compressive strength initially increases before diminishing.(1)The compressive strength of carbon nanotube electrothermal concrete based on the selection of raw materials and the preparation process in this paper is greater than 40 MPa,which meets the design strength requirements and can meet the needs of engineering applications.At the same time,it is found that the effect of carbon nanotubes on compressive strength enhancement is firstly increasing and then decreasing.(2)Study the effect of alternating frequency and ambient temperature on the resistivity of carbon nanotube heated concrete,the test results show that there is no obvious relationship between the amount of carbon nanotubes and resistivity,when the amount of carbon nanotubes is 0.025%,0.1%,1%can effectively reduce the resistivity of concrete materials;alternating frequency and ambient temperature increase at the same time carbon nanotube heated concrete resistivity will decline.(3)To study the effect of voltage and carbon nanotube doping on the electrothermal performance of carbon nanotube heated concrete,the test shows that 60V will increase the heating rate of carbon nanotube heated concrete significantly compared with 30V,and the surface of M10 test block can reach 40℃ after 1800s of energization;there is no obvious relationship between the doping amount and the performance of electrothermal performance,carbon nanotube doping amount of 0.025%and 1.0%can effectively The doping amount of 0.025%and 1.0%of carbon nanotubes can effectively increase the heating rate of carbon nanotubes.(4)ABAQUS finite element software was used to establish a finite element model of the carbon nanotube electrothermal concrete cube,and the performance of the electrothermal properties of each surface of the cube was obtained from the finite element simulation.(5)Analyzing the performance of electric heating performance under different thermal conductivity,specific heat capacity,ambient initial temperature and input effective power,we get that the increase of thermal conductivity has a promotion effect on the electric heating performance of carbon nanotube electric concrete,the increase of specific heat capacity can enhance the heat storage capacity,the increase of input power effectively improves the electric heating performance of carbon nanotube,but attention should be paid to the actual work of Safety.