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    A hydrophobic release agent containing SiO2-CH3 submicron-sized particles for waterproofing mortar structures

    Year: 2019

    Journal: Constr. Build. Mater., Volume 199, FEB 28, page 30–39

    Authors: Izarra, Irene; Cubillo, Jose; Serrano, Angel; Francisco Rodriguez, Juan; Carmona, Manuel

    Organizations: European Commission [646397-NANOLEAP]

    Keywords: Hydrophobic submicron-sized particles; Stober process; Release agent; Mortar/concrete waterproofing

    Hydrophobic release agents were developed from SiO2-CH3 submicron-sized particles containing hydrophilic and hydrophobic functional groups dispersed into a vegetable oil as support. The SiO2-CH3 submicron-sized particles were synthesized by changing the molar ratio between the precursors Tetraethyl orthosilicate (TEOS) and Methyltriethoxysilane (MTES) from 0.66 to 5 (MTEOS-0.66 to MTEOS-5), being the relative amount of SiO2-CH3 quantified by FTIR technique. Mortar specimens having hydrophobic properties were manufactured using 3 wt% of the above SiO2-CH3 submicron-sized particles. Additionally, the concentration effect was studied by using MTEOS-0.66 within 3-10 wt%. The hydrophobic properties of the mortar specimens were checked by measuring the contact angle within water droplets and surface. The particle size increased with the MTES/TEOS molar ratio and according to the hydrophobic properties, the proper release agent must be synthesized by using MTEOS-2.5 dispersed into the vegetable oil and having a concentration of 3 wt%. This hydrophobic release agent led mortar surfaces with contact angles higher than 145 degrees. Waterproofing and mechanical studies on concrete specimens allowed to conclude that this demoulding agent does not have a high penetration depth but improved the concrete waterproofing properties, without depletion in the compressive strength. (C) 2018 Elsevier Ltd. All rights reserved.
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