Effect of SiO₂ oligomers on water absorption of cementitious materials

SiO₂ oligomers, a kind of intermedium between silane and SiO₂ nanoparticles, reveal small size, hydrophilic property, and high affinity with cement paste. In cement-based materials, the SiO₂ oligomers transform into SiO₂ nanomaterials. This is first time to report SiO₂ oligomers created by the hydrolysis and condensation reactions of tetraethyl orthosilicate in an acetic acid solution to reduce the water absorption rate and modify the surface microstructure of cement-based materials. Mild acetic acid makes the stable formation of SiO₂ oligomers which promote the reaction with cement phases. Linear, branched and 3D-chain structures of SiO₂ particles can be formed in sequence during the condensation of oligomers. The water absorption rate of cement mortars treated with SiO₂ oligomers was reduced to 46.4%. The SiO₂ oligomers were ideal candidate as a surface-treated agent which resulted in surface densification of cement-based materials.

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  • English

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  • Accession Number: 01609832
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 5 2016 2:30PM