Evaluating the Influence of Hydrophobic Nano-Silica on Cement Mixtures for Corrosion-Resistant Concrete in Green Building and Sustainable Urban Development

Mohammadfarid Alvansazyazdi (), Fabricio Alvarez-Rea, Jhon Pinto-Montoya, Majid Khorami (), Pablo M. Bonilla-Valladares, Alexis Debut and Mahdi Feizbahr
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Mohammadfarid Alvansazyazdi: Institute of Science and Concrete Technology (ICITECH), Universitat Politècnica de València, 46022 Valencia, Spain
Fabricio Alvarez-Rea: Carrera de Ingeniería Civil, Universidad Central Del Ecuador, Av. Universitaria, Quito 170521, Ecuador
Jhon Pinto-Montoya: Carrera de Ingeniería Civil, Universidad Central Del Ecuador, Av. Universitaria, Quito 170521, Ecuador
Majid Khorami: Facultad de Arquitectura y Urbanismo, Universidad UTE, Calle Rumipamba S/N y Bourgeois, Quito 170147, Ecuador
Pablo M. Bonilla-Valladares: Facultad de Ciencias Químicas, Universidad Central del Ecuador, Francisco Viteri s/n y Gilberto Gato Sobral, Quito 170521, Ecuador
Alexis Debut: Departamento de Ciencias de la Vida y la Agricultura, Centro de Nanociencia y Nanotecnología, Universidad de las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador
Mahdi Feizbahr: School of Civil Engineering, Engineering Campus, University Sains Malaysia, Nibong Tebal 14300, Penang, Malaysia

Sustainability, 2023, vol. 15, issue 21, 1-13

Abstract: The use of hydrophobic nano-silica particles in concrete for improved corrosion resistance and durability has been explored in recent years, and its potential impact on sustainable urban development and green building practices has been studied. The impact of substituting hydrophobic nano-silica particles for 2% of the cement weight in high-strength concrete mixes was investigated in this research. The study focuses on evaluating the physical-mechanical properties, including compressive strength, tensile strength, modulus of elasticity, and Poisson’s ratio. Additionally, the influence of these mixes on corrosion resistance is examined. The concrete designs feature a high strength of 42 MPa, and the hydrophilic nano-silica particles undergo functionalization processes to obtain hydrophobic properties. Contact angle measurements and water absorption tests confirm the hydrophobicity of the material. Physical, electrochemical, and electrical tests were conducted to determine the corrosion resistance contribution of the nano-silica particles when substituted at 2% of the cement weight. The research findings reveal that concrete containing nano-silica particles demonstrates improved physical-mechanical properties compared to other mixes. Incorporating nano-silica enhances concrete by accelerating hydration, increasing early-age strength, and providing hydrophobicity, resulting in improved physical-mechanical properties over other mixes. However, it was observed that the addition of hydrophobic and non-hydrophobic nano-silica tends to reduce corrosion resistance compared to concrete without these particles, despite exhibiting greater compactness. This suggests a direct influence of nano-silica on the corrosion phenomenon.

Keywords: hydrophobic nano-silica; corrosion-resistant concrete; green building; sustainable urban development; cement mixtures (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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