The phase change cement-based micro/nano-porous materials were prepared by using nanopore-forming a-gents and microencapsulated phase change materials.The microstructure,mechanical properties and thermal properties of the phase change cement-based micro/nano-porous materials were studied,and the results were compared with cement-based micro/nano-porous materials or phase change cement-based materials.The results show that the addition of high content of pore-forming agent can reduce the dry density and thermal conductivity of the materials,the addition of micro-encapsulated phase change materials can further reduce the compressive strength,dry density and thermal conductivity of the test materials,increase the porosity and average pore size,and greatly improve the specific heat capacity of the test ma-terials.Among them,the phase change cement-based micro/nano-porous materials with a pore-forming agent content of 80％have the lowest dry density and thermal conductivity,were 429.9 kg/m3 and 0.086 W/(m·K),and the specific heat capacity was 1.2 J/(g·K).The phase change cement-based micro/nano-porous materials have a good ability to regulate temperature,compared with the cement paste with the same size,the peak temperature decreased by 7.2 ℃ and the valley temperature increased by 2.7 ℃,and showed the effect of peak shifting and valley filling.
NETL
NSTL
万方数据
