경량 발포 콘크리트

최근에는, lightweight foamed concrete has gained popularity because of its thermal insulation properties and ease of production. 하지만, this type of concrete has the drawback that it is highly unstable in its fresh state and exhibits high drying shrinkage when hardened. 이 논문에서는, we develop an improved foamed concrete mixture that can withstand these adverse phenomena. The experimental results of this mixture showed that its pore structure is strongly influenced by its dry density, which is mainly determined by the foam content. 따라서, it is crucial to reduce the dry density of this material in order to improve its stability in its fresh and hardened states.

The optimum ratio of cement, foamed aggregate, and water was achieved by adjusting the concentration of a typical supplementary cementitious materials (SCM) 비산회와 같은, 분쇄된 고로 슬래그, 및 실리카 흄. The SCMs are incorporated in a varying range of proportions from 30 에게 70 percent by volume. In addition to these SCMs, a specific foaming agent called GENFIL is added for the purpose of producing stable and homogenous cellular lightweight concrete.

The foamed concrete was produced using a wet method by utilizing static inline mixers with continuous on board density monitors to ensure the proper blending of the base and foamed aggregates. The resulting concrete was found to have a high water retention, a relatively low viscosity, and a strong thixotropic behavior, and it had a higher compressive strength at early ages than the control mix with cement alone. 게다가, the flexural strength was found to increase significantly with the inclusion of POFA, due to the formation of additional C-S-H gel by the pozzolanic reaction of this SCM.