Category: Transient Plane Source
Author(s): Heping Zhang, Junjie Feng, Lunlun Gong, Ruifang Zhang, Xudong Cheng, Ye Li
Keywords: building materials, Compressive Strength, Differential Thermal Analysis, porosity, Scanning Electron Microscope, Scanning electron microscope (SEM), SEM, Thermal Conductivity, Thermal Gravity Analysis, thermal insulation, Transient Plane Source Technique, XRD
Abstract: Coal fly ash was used as the base material for the formation of thermal insulation materials. The porosity of the produced materials ranged from 86.3-94.5 vol. %. The insulating materials were prepared by ball milling, followed by foaming assisted by the addition of K12, casting and drying, and finally sintering. No harmful chemicals were released to the environment during their preparation. It was found that the thermal conductivity of the samples was dependent on the sintering temperature that they had been prepared at, with the conductivity increasing as the sintering temperature increased. Three different loading concentrations of fly ash were used, 30, 35, and 40 wt. % and it was found that the thermal conductivity increased with the loading concentration. These two trends were also observed for the measured compressive strength. The lowest thermal conductivity achieved was 0.0511 W/m K for a loading concentration of 30 wt. % and a sintering temperature of ~850oC. This low thermal conductivity indicates ...
Reference: Energy and Buildings 81 (2014) 262–267