Affects the foam concrete structure

Not only does the density affect the compressive strength and thermal conductivity, but it also affects the foam concrete structure. The synthetic or protein nature of the foaming agent contributes to differences in air-void distribution and, as a result, the design of the foam concrete. Using protein-based foaming agents resulted in predominantly microscopic, regular-shaped voids that make the structure more uniform. Then, much better thermo-mechanical properties were obtained for the concrete made of a protein-based foaming agent. In this case, the compressive strength was higher with lower thermal conductivity. It is replacing ordinary Portland cement (OPC) with calcium sulphoaluminate (CSA) cement creating low-density foam concrete with uniformity of structure and regularity of the air voids. Thus, CSA cement significantly improved FC's mechanical and thermal behavior with a synthetic foaming agent. Hence, the use of CSA cement shows promising results and has the potential to be applied to foam concrete. Unfortunately, CSA adhesive combined with a protein-based foaming agent destroyed the foam immediately after mixing the paste and foam.

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