废旧发泡混凝土定型相变材料制备及热性能研究

Study on preparation of shape-stable phase-change materials based on cellular concrete and their performances

为规模化消纳城市固体废弃物,降低废旧发泡混凝土大量堆积对城市生态环境的破坏。提出以废旧发泡混凝土作为骨架材料,对其进行预烧结处理,以Na_(2)CO_(3)为相变材料制备定型相变材料。结果表明:废旧发泡混凝土可以负载质量分数为45%的Na_(2)CO_(3);差示扫描量热法(DSC)测得该定型相变材料的熔化潜热为126.7 J/g;X射线衍射法(XRD)和傅里叶变换红外法(FT-IR)表明,骨架材料和相变材料之间有良好的化学相容性;激光导热分析法(LFA)测得该定型相变材料的导热系数最大为0.24 W/(m·K)。

To accommodate massive municipal solid wastes,and avoid environmental pollution resulting from serious waste concrete accumulation,a shape-stable phase-change material(SSPCM)taking waste cellular concrete(WCC)after presintering as its skeleton material and using Na_(2)CO_(3)as its phase-change material is proposed.The test results show that the sintered WCC loading with 45%Na_(2)CO_(3)is of a melting latent heat of 126.7 J/g measured by a differential scanning calorimeter(DSC).And according to the results of X-Ray diffraction(XRD)and Fourier transform infrared(FT-IR),the chemical compatibility between the skeleton material and phase change material of the SSPCM is good.The maximum thermal conductivity of the SSPCM is 0.24 W(/m·K)measured by laser flash analysis(LFA).