摘   要：研究了不同复合相变材料C14/EG掺量（0、1%、2%、3%、4%）对相变储能混凝土力学性能、热学性能和微观结构的影响，分析了影响机理。结果表明：随着C14/EG掺量的增加，混凝土的抗压强度、导热系数、干密度均降低，保温性能提高；C14/EG可以显著减缓混凝土内部温度变化进程，水泥的水化程度降低，混凝土内部水化产物减少，整体结构相对疏松，无害孔占比减少，多害孔和有害孔占比增加，混凝土内部的小孔逐渐向大孔转变；整体来看，当C14/EG掺量为2%时，混凝土具有良好的低温储热性能，且抗压强度相对较好。Abstract: The effects of different contents of composite phase change materials C14/EG(0, 1%, 2%, 3%, 4%) on the mechanical properties, thermal properties, and microstructure of phase change energy storage concrete were studied, and the influencing mechanism was analyzed. The results show that with the increase of C14/EG content, the compressive strength, thermal conductivity, and dry density of concrete decrease, and the insulation performance improves. C14/EG can significantly slow down the temperature change process inside the concrete, reduce the hydration degree of cement, decrease the hydration products inside the concrete, make the overall structure relatively loose, reduce the proportion of harmless pores, increase the proportion of multiple harmful pores and harmful pores, and gradually transform the small pores inside the concrete into large pores. Overall, when the C14/EG content is 2%, the concrete has good low temperature heat storage performance and relatively good compressive strength.

艾杰,陈延飞,车俊,等.相变储能混凝土的性能研究及机理分析[J].混凝土与水泥制品,2025(12):56-59,82. AI J,CHEN Y F,CHE J,et al.Performance study and mechanism analysis of phase change energy storage concrete[J].China Concrete and Cement Products,2025(12):56-59,82.

摘   要：对比研究了采用真空吸附法与内掺法制备的水泥基相变泡沫混凝土（Cement based phase change foamed concrete，CPFC）和水泥-聚苯颗粒基相变泡沫混凝土（Cement-polystyrene particle based phase change foamed concrete，CPPFC）的性能差异，测试分析了其抗压强度、体积吸水率、相变稳定性和热工性能，进而研究了不同浓度（0、1%、3%、5%）聚乙烯醇对石蜡的封装效果，并进行了微观分析。结果表明：内掺或真空吸附石蜡均会导致相变泡沫混凝土的抗压强度、体积吸水率降低，延缓箱体内的温度下降速率，但会导致箱体内的温度升高；在相同设计干密度条件下，与CPFC组相比，CPPFC组的抗压强度和体积吸水率更低，相变循环50次后的劣化情况更严重；总体而言，与真空吸附法相比，采用内掺法制备的相变泡沫混凝土的综合性能相对较好；在石蜡乳化过程中掺加聚乙烯醇，对相变泡沫混凝土具有显著的封装作用，且随着聚乙烯醇浓度的增加，50次相变循环后试件的质量损失率先减小后增大，强度损失率降低。Abstract: The performance differences between cement based phase change foamed concrete (CPFC) and cement-polystyrene particle based phase change foamed concrete (CPPFC), prepared using vacuum adsorption and internal incorporation methods, were comparatively studied. The compressive strength, volumetric water absorption rate, phase change stability, and thermal performance were tested and analyzed. The encapsulation effect of polyvinyl alcohol with different concentrations (0%, 1%, 3%, 5%) on paraffin was investigated, along with microscopic analysis. The results indicate that both internal incorporation and vacuum adsorption of paraffin can reduce the compressive strength and volumetric water absorption rate of phase change foamed concrete, delay the temperature decline rate inside the box, but will increase the temperature. Under the same design dry density conditions, the CPPFC group exhibits lower compressive strength and volumetric water absorption rate compared to the CPFC group, with more severe deterioration after 50 cycles of phase change. Overall, phase change foamed concrete prepared by the internal incorporation method demonstrates relatively better comprehensive performance compared to the vacuum adsorption method. Adding polyvinyl alcohol during the paraffin emulsification process significantly enhances the encapsulation effect of phase change foamed concrete. As the polyvinyl alcohol concentration increases, the mass loss rate of the specimens after 50 cycles of phase change first decreases and then increases, while the strength loss rate decreases.

李晓,赵君友.石蜡装载工艺与封装技术对相变泡沫混凝土性能的影响研究[J].混凝土与水泥制品,2025(12):50-55. LI X,ZHAO J Y.Study on the influence of paraffin loading technology and encapsulation technology on the performance of phase change foamed concrete[J].China Concrete and Cement Products,2025(12):50-55.