Effect of modified SiO2 aerogel on the properties of inorganic cementing materials

SiO2 aerogel and cement-based cementing materials mixed prone to fragmentation, agglomeration, flying and floating, resulting in SiO2 aerogel in cement-based cementing materials can not be evenly distributed. In addition, the mixture of hydrophobic SiO2 aerogel and cement-based cementing materials has low adhesion and poor compatibility. In this study, the SiO2 aerogels were modified in different ways for improved compatibility with inorganic cementing materials. The results show that the SiO2 aerogel slurry (A4) modified by cation, non-ionic and inorganic surfactant had superior dispersibility in inorganic cementing materials. When the content of A4 was 30 wt%, the dry density, thermal conductivity and compressive strength of the sample were 1136.4 kg/m3, 0.1889 W/(m∙K), and 17.16 MPa, respectively.