基于生物涂层/相变微胶囊的储能砂浆力学及温控性能
Mechanical and temperature control properties of energy storage mortar based on bio-coating/phase change microcapsules
张家玮 1马建虎 1黄玮 1夏召来 1杨利军 1刘生纬1
作者信息
- 1. 兰州交通大学 土木工程学院,兰州 730070
- 折叠
摘要
为研究生物涂层/相变微胶囊对水泥砂浆力学及温控性能的影响,将表面覆有聚多巴胺涂层的相变微胶囊(PD-PCM)引入水泥砂浆中制成储能砂浆.研究了不同PD-PCM掺量(5％～20％)储能砂浆的微观结构、力学性能、热工性能和冬季低温环境下的温控性能.结果表明:储能砂浆的孔隙率随着PD-PCM掺量的增加而增大,20％掺量孔隙率增加 23.2％;添加PD-PCM有效减缓了传统相变储能砂浆抗压强度的大幅下降,其5％和 10％掺量较基准砂浆分别提高 3.6％及 3.8％,20％掺量仅下降 16.8％;PD-PCM的添加改善了砂浆的热工性能,其导热系数随着PD-PCM掺量的增加而降低,热阻随着PD-PCM掺量的增加而提高,20％掺量导热系数降低 25.8％,热阻提高 38.9％;通过绝热箱实验可知,当PD-PCM掺量为 20％时,其箱内谷值温度与时滞分别较基准水泥砂浆增加 1.1℃和 10 min.相变储能砂浆在满足力学性能要求的同时,又具有良好的热工性能和储能调温能力,在建筑调温等领域具有广阔的应用前景.
Abstract
In order to study the effect of bio-coating/phase change microcapsules on the mechanical and tem-perature control properties of cement mortar,phase change microcapsules coated with polydopamine(PD-PCM)on the surface were introduced into cement mortar to make energy storage mortar.The microstructure,mechanical properties,thermal properties and temperature control properties of energy storage mortars with different PD-PCM dosages(5％-20％)were investigated under the low-temperature environment in winter.The results show that:The porosity of energy storage mortar increases with the increase of PD-PCM dosage,and the porosity of 20％dosage increases by 23.2％;the addition of PD-PCM effectively slows down the significant decrease of compressive strength of traditional phase change energy storage mortar,and its 5％and 10％dosage increase by 3.6％and 3.8％respectively compared with the baseline mortar,and the 20％dosage decreases by 16.8％;the addition of PD-PCM improves the thermal performance of the mortar,and the thermal performance of the mortar is improved by 20％dosage,and the thermal performance of the mortar is reduced by 20％.The addition of PD-PCM improves the thermal performance of mortar,its thermal conductivity decreases with the increase of PD-PCM dosage,and the thermal resistance increases with the increase of PD-PCM dosage,the thermal conductivity decreases by 25.8％with 20％dosage,and the thermal resistance improves by 38.9％;Through the experiment of adiabatic box,it can be seen that when the dosage of PD-PCM is 20％,the valley temperature and time lag of its box increase by 1.1℃and 10 min,compared with that of the standard cement mortar,respectively.The phase change energy storage mortar has good thermal performance and energy storage and temperature regulation capability while meeting the requirements of mechanical properties,which has a broad application prospect in the field of building temperature regulation.
关键词
聚多巴胺涂层/相变微胶囊/储能砂浆/微观结构/力学性能/温控性能Key words
polydopamine coating/phase change microcapsules/energy storage mortar/microstructure/mech-anical properties/temperature control performance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据