Design and fabrication of bioinspired cement aerogel and its performance analysis
To address the contradiction of achieving a balance between high mechanical performance and high thermal insulation in traditional building materials,inspiration was drawn from the"layer-wall"structure of the deep-sea cuttlefish.By utilizing a controlled directional freezing method,calcium silicate hydrate nucleated and formed a biomimetic microstructure within a polymer solution.The manufacturing process adopted a ver-satile and low-energy-consuming freeze-drying technique,to design and create a novel,directionally porous cement aerogel.The results indicate that this cement aerogel has an exceptionally low density of 15.02 kg/m3,a porosity of up to 90.64％,and a thermal conductivity as low as 0.020 W/(m·K).Additionally,it exhibits a negative Poisson's ratio of-0.168 and a high specific strength of 1 216.88 MPa/(cm-3·g).Under 70％strain,the cement aerogel prepared with a calcium to silicon mass ratio of 1.0 exhibites its maximum compres-sive strength of 33.89 MPa.Moreover,the intricate porous structure of the cement aerogel provides excellent sound absorption properties,with a noise attenuation coefficient of up to 0.8.
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