Then, the cement type employed in foam concrete was compared regarding thermal conductivity. The obtained results for foam concrete with the considered Buildings 2022, 12, 1176 17 of 20 densities below 500 kg/m3 revealed the beneficial effect of CSA cement on thermal conductivity. Values in the range of 0.048–0.062 Wm−1K−1 were measured for CSA cement, while for OPC, thermal conductivity was between 0.052 and 0.07 Wm−1K−1 in the same density variation. Once again, the reason lies in the substantial differences in the structure since CSA cement ensures a more homogenous structure and uniform distribution of small air voids in foam concrete. The last of the analyzed issues was the effect of the synthetic and protein-based foaming agents on the thermal behavior of foam concrete. The results depicted in Figure 16 indicated better thermal properties for the foam concrete made with a protein-based foaming agent. Then, using a protein-based foaming agent ensures a substantial decrease in thermal conductivity values for all investigated densities. For the air-dry density of 240 kg/m3, the thermal conductivity was measured at 0.051 Wm−1K −1 for the protein-based foaming agent, and 0.058 Wm−1K −1 was registered for the synthetic one. Similar results of the conductivity tests for protein-based foaming agent FC, where the thermal conductivity of 0.0505 Wm−1K −1 (for density of 160 kg/m3 ) and 0.0568 Wm−1K −1 (for density of 191.55 kg/m3 ) was noted.
Additionally, in such low ranges of density, a nearly linear dependence of thermal conductivity against the dry density was observed; however, the obtained variance in values indicates the complex relation between thermal conductivity, the density, the air-void distribution, w/c ratio, and the glue composition of the composites. Similar or even the same thermal conductivity was achieved for FC with a synthetic foaming agent and CSA cement based on the protein foaming agent and OPC cement. So, the introduction of CSA cement significantly improved the compressive strength and thermal properties. All obtained results relating to thermal conductivity are summarized with the visible influence of all investigated individual components of foam concrete. If you are looking for a high quality, high purity, and cost-effective foaming agent, or if you require the latest price, please feel free to email contact mis-asia.
