NANOSIZED CORE-SHELL STRUCTURED ORGANIC-INORGANIC COMPOSITE CONCRETE-PROTECTING AGENT AND PREPARATION METHOD AND USE THEREOF

摘要

Embodiments of the present invention disclose a nanosized core-shell structured organic-inorganic composite concrete-protecting agent, as well as its preparation method and use, which belong to the technical field of construction materials. The present invention allows silane groups to wrap the surface of nano-SiO 2 to form a core-shell structure, so as to effectively combine organic and inorganic protecting agents and provide protection for surface-hardened concrete. The present invention avoids the problem of easy ageing of the organic components, separates the preparation and application of materials, saves time for hydrolysis of precursors, and provides double protection for concrete structures. The present invention has the advantages of both organic and inorganic materials. On one hand, silane forms a protective film on the surface of concrete to exert a hydrophobic effect. On the other hand, nano-SiO 2 has high pozzolanic activity and undergoes hydration reaction with the hydration product of cement Ca(OH)2 to form a hydrated gel which densifies the pore structures. The protecting agent is characterized by offering a good protection effect, being easy to prepare, and being convenient for construction application, and can be widely applied in the field of concrete-based constructions. (Figure 1) hydroxy hydrophobic (4