Fabrication of integrally hydrophobic self-compacting rubberized mortar with excellent waterproof ability, corrosion resistance and stable mechanical properties

• Published in: Construction & building materials Vol. 304; p. 124684
• Main Authors: Tian, Lei, Qiu, Liu-chao, Liu, Yi
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 18.10.2021
• Subjects: Chloride corrosion; Environmentally friendly; Flowability; Hydrophobicity; Mechanical properties; Microstructure; Self-compacting rubberized mortar; Waste tires rubber; Waste tires rubber; Flowability; Mechanical properties; Environmentally friendly; Hydrophobicity; Microstructure; Chloride corrosion; Self-compacting rubberized mortar
• ISSN: 0950-0618
• DOI: 10.1016/j.conbuildmat.2021.124684

•The prepared HSCRM possesses excellent integral hydrophobicity.•The fresh HSCRM shows excellent self-compacting capability.•The HSCRM exhibits excellent anticorrosion property.•The HSCRM possesses improved toughness and ductility. Ordinary cement-based materials exhibit strong hydrophilicity and brittleness after hardening, which is very detrimental to their durability and service life. In this study, a low-cost and nontoxic silane-based hydrophobic agent and waste tire rubber particles are used to make integrally hydrophobic self-compacting rubberized mortar (HSCRM). The fluidity of the HSCRM is enhanced and its setting time is prolonged with increasing hydrophobic agent content. When the content of the hydrophobic agent is 2%, the HSCRM exhibits integral overhydrophobicity, with the static contact angle (CA) on the surface larger than 120°. In addition, compared with the self-compacting mortar (SCM), the immersion water absorption and capillary water absorption of HSCRM decrease by 72.1% and 89.3%, respectively, while the corrosion resistance of the HSCRM is significantly enhanced and its surface deicing process is much easier. Moreover, the 28 d flexural strength, compressive strength and splitting tensile strength of the HSCRM are 18.9%, 32.3%, and 17.2% lower than those of the SCM, respectively, but the toughness and ductility of the HSCRM are significantly improved.