Autoclaved aerated concrete was studied because it has potential to be used in the design of energy-efficient buildings. Three different samples were tested, each with a unique density. Of particular interest to this work was the thermal conductivity of the samples, as this material would be used as a thermally insulating concrete. The thermal conductivities were measured at various percentages of moisture content, and it was found that increasing moisture ...
The thermal and physical properties of concrete were investigated at high temperature to determine how these properties might change in the event of a fire. The influence of the type and content of aggregate was also investigated. It was found that the degradation and mass loss of concretes depends on the type of aggregate used. It was also determined that the porosity of concretes increases as temperature increases, and that ...
In an effort to be more environmentally friendly, the construction industry is investing more in 'green' concretes and insulation materials. The purpose of this research was to create a porous foam using a geopolymer mixture and varying amounts of silica carbide sludge. By changing the amount of the sludge added, researchers could control what type of microstructure was produced. The effect of this variation on porosity and thermal properties was ...
This paper investigates the effect sulphate exposure has on the thermal conductivity and mechanical strength of low density cement based foams, with and without microfiber reinforcement. This was done by exposing these cement foams to sulfphate over 90 days. The compressive strength and flexural toughness displayed a cyclic rise and fall for the plain sample, and the opposite for the reinforced sample. The thermal conductivity showed an initial rise, but then ...
The thermal properties of oil palm shell (OPS) are investigated to determine if it could be used as a lightweight aggregate for a concrete mixture. The thermal conductivity, diffusivity, and specific heat were all tested through a transient plane source (TPS) method. The thermal conductivity and diffusivity both increased as the volume fraction of OPS increased. This is because OPS is very porous which gives it an inherently low thermal ...
