Preparation and Characterization of Stearic Acid as Phase Change Materials for Portland Cement Application

• Main Authors: Chi-Fa Chao, 趙啟發
• Other Authors: HSIEH,TAR-HWA
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/n3w7cg

碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系碩士在職專班 === 106 === In this thesis，portland cement composites were prepared by using mixing method，where portland cement (type I)，water，calcium chloride，octadecanoic acid/water glass composite acted as the matrix，medium，accelerator，and phase change material (PCM)， respectively。The mechanic properties，insulation and energy saving characteristics were investigated by differential scanning calorimeter，fourier transform infrared spectrometer and concrete compression tester. Effects of water-cement ratio (W/C)，the amount of accelerator and PCM on the mechanic properties， insulation and energy saving characteristics of portland cement composite were studied. Results showed that，as the W/C is 0.35 to 0.40 shows better workability than W/C is 0.45，and the compressive strength of 28 days cured portland cement can reach the standard of 210 kgf/cm2 specification of ASTM C109 for suitable heat insulation and energy saving concrete matrix。As for hydration reaction curve, the addition of 1 to 5 wt% calcium chloride can accelerate the initial hydration reaction rate of portland cement and increase its early strength。Scanning thermal analyzer shows octadecanoic acid/water glass PCM The peak values of the two peaks are：the main peak heat Capacity value is 60.1 J/g, the secondary peak is 42.9 J/g，and the phase change temperature is 65~85°C，which is suitable for building materials in desert areas. Thermal insulation/energy storage。Portland cement/PCM composite thermal insulation/energy storage results show that Portland cement added with octadecanoic acid/water glass PCM has the advantages of time delay and strength attenuation for external thermal energy，and can adjust the comfort of building living temperature。The excellent performance。