Preparation and heat insulation of Gemini-halloysite aerogel/concrete composites

摘要

In our previous research, the utilization of Gemini surfactants to control the dispersion and interaction of HNTs aerogels (HCAs) in the concrete matrix had obtained positive research results. In order to further deepen the research in this field, in this work, a Gemini surfactant with a new structure was synthesized, the surface modification characteristics of HCAs in a series of concrete systems were also investigated. Microstructures and properties of the composites were characterized by using scanning electron microscope (SEM), Fourier transform infrared (FTIR), Thermogravimetric analysis (TGA), and so on. The results showed that the newly synthesized Gemini surfactants had an ideal modification effect on the surface of HCAs. Compared with other traditional surfactants, Gemini had better hydrophobic and mechanical properties. Different molecular layers with hydrophilicity or hydrophobicity were constructed on the HCAs surface. The introduction of the modified HCAs could significantly improve the heat insulation performance and mechanical strength of concrete. The improvement of the above comprehensive properties could not have significant difference due to the different types of concrete matrix.