轻质相变混凝土的研发及物理力学性能实验研究
Development and experimental study on the physical-mechanical properties of lightweight phase change concrete
王秀丽 1李威龙 1徐晶晶1
作者信息
- 1. 兰州理工大学土木工程学院,兰州 730050;兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州 730050
- 折叠
摘要
以SiO2气凝胶粉末为基体材料,低温相变石蜡为相变材料制备定型复合相变材料;采用傅里叶红外光谱仪、差示扫描量热仪、同步热分析仪及扩散-渗出圈测试对定型复合相变材料进行表征分析及稳定性检验.结果表明:石蜡吸附质量为75％时制备的定型复合相变材料最为稳定,SiO2气凝胶与石蜡之间仅为物理吸附,定型复合相变材料的相变温度为26.52 ℃,相变潜热为56.2 J/g.将其掺入EPS混凝土,水泥净浆流动度实验限定定型复合相变材料掺加量在16％附近时,混凝土拌合物工作性能最佳.进行物理力学性能测试,发现随着定型复合相变材料的掺入,试件抗压、抗折、抗劈裂强度均有一定程度的提高.通过热箱储热性能试验,掺加定型复合相变材料的试件升降温曲线斜率及峰值均有降低现象,表明轻质相变混凝土具有很好的温控性能,可用于节能建筑围护体系.
Abstract
Using silica aerogels as the matrix material and low-temperature phase change paraffin wax as the phase change material,shaped composite phase change materials were prepared.Characterization and stability tests of the shaped composite phase change materials were conducted using Fourier-transform infrared spectros-copy,differential scanning calorimetry,synchronous thermal analysis,and diffusion-permeation circle tests.The results indicate that the shaped composite phase change material prepared with a wax adsorption mass of 75％is the most stable,with the interaction between silica aerogels and paraffin wax being purely physical ad-sorption.The phase transition temperature of the shaped composite phase change material is 26.52 ℃,and the latent heat of phase transition is 56.2 J/g.By incorporating it into EPS concrete,the cement paste flowability experiment restricts the optimum proportion of shaped composite phase change material to around 16％,yield-ing optimal working performance of the concrete mixture.Physical-mechanical property tests reveal that with the addition of the shaped composite phase change material,the compressive,flexural,and splitting tensile strengths of the specimens all exhibit a certain degree of improvement.Through thermal storage performance tests in a thermal chamber,specimens with added shaped composite phase change material show a decrease in the slope and peak value of the heating and cooling curves.This indicates that lightweight phase change concrete has excellent temperature control performance and can be used in energy-efficient building envelope systems.
关键词
相变混凝土/建筑节能/表征分析/物理力学性能/温控性能Key words
phase change concrete/building energy efficiency/characterization analysis/physical and mechanical properties/temperature control performance引用本文复制引用
基金项目
国家自然科学基金(52368001)
国家重点研发计划(2019YFD1101004)
出版年
2024
NETL
NSTL
万方数据