PSI - Issue 67

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2024) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2024) 000–000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 67 (2025) 61–79

International Symposium on Nanotechnology in Construction Materials NICOM8 A Comparative Study of the Impact of Nano-TiO 2 and Nano-silica on the Durability of Concretes Cured at Different Temperatures Dan Huang a* , Mirian Velay-Lizancos b , and Jan Olek b International Symposium on Nanotechnology in Construction Materials NICOM8 A Comparative Study of the Impact of Nano-TiO 2 and Nano-silica on the Durability of Concretes Cured at Different Temperatures Dan Huang a* , Mirian Velay-Lizancos b , and Jan Olek b a Department of Physics and Engineering Science, Coastal Carolina University, Conway, SC 29528, USA b Lyles School of Civil and Construction Engineering, Purdue University, West Lafayette, IN 47907, USA a Department of Physics and Engineering Science, Coastal Carolina University, Conway, SC 29528, USA b Lyles School of Civil and Construction Engineering, Purdue University, West Lafayette, IN 47907, USA Abstract A comparative study was conducted to evaluate the impact of diffident types of nanoparticles, specifically nano-TiO 2 and two types of proprietary nano-silica, on the mechanical and durability properties of concretes cured at varying temperatures. The study involved the assessment of compressive and flexural strengths of concretes with and without the incorporation of nanoparticles. Resistivity measurements were also performed to assess the influence of nanoparticles on pore connectivity. Additionally, the total pore volume of concretes with and without the addition of nanoparticles was also measured and water absorption tests were conducted to explore the impact of nanoparticles on concrete permeability. The study further evaluated the damage incurred by concretes exposed to freeze-thaw cycles and deicers, comparing materials with and without nanoparticles. The findings indicated that all types of nanoparticles enhanced concrete’s mechanical properties and durability. Specifically, they significantly reduced total porosity, pore connectivity, and water permeability, with these improvements being more pronounced effect in concretes cured at low temperatures. In terms of increasing the scaling resistance, the optimal dosage of nano-TiO 2 was determined to be 0.5%. However, both the 0.5% and 1.0% dosages contributed to improved mechanical strength of concrete. Finally, a synergistic effect was observed when both types of nano-silica were combined, leading to improvements in the overall performance of the concrete. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of NICOM8 Chairpersons Abstract A comparative study was conducted to evaluate the impact of diffident types of nanoparticles, specifically nano-TiO 2 and two types of proprietary nano-silica, on the mechanical and durability properties of concretes cured at varying temperatures. The study involved the assessment of compressive and flexural strengths of concretes with and without the incorporation of nanoparticles. Resistivity measurements were also performed to assess the influence of nanoparticles on pore connectivity. Additionally, the total pore volume of concretes with and without the addition of nanoparticles was also measured and water absorption tests were conducted to explore the impact of nanoparticles on concrete permeability. The study further evaluated the damage incurred by concretes exposed to freeze-thaw cycles and deicers, comparing materials with and without nanoparticles. The findings indicated that all types of nanoparticles enhanced concrete’s mechanical properties and durability. Specifically, they significantly reduced total porosity, pore connectivity, and water permeability, with these improvements being more pronounced effect in concretes cured at low temperatures. In terms of increasing the scaling resistance, the optimal dosage of nano-TiO 2 was determined to be 0.5%. However, both the 0.5% and 1.0% dosages contributed to improved mechanical strength of concrete. Finally, a synergistic effect was observed when both types of nano-silica were combined, leading to improvements in the overall performance of the concrete. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of NICOM8 Chairpersons © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of NICOM8 Chairpersons Keywords: Concrete; Nano-TiO 2 ; Nano-silica; Strength; Porosity; Formation factor; Water absorption; Scaling resistance. Keywords: Concrete; Nano-TiO 2 ; Nano-silica; Strength; Porosity; Formation factor; Water absorption; Scaling resistance.

* Corresponding author. Tel.: +1-843-349-6489. E-mail address: dhuang@coastal.edu * Corresponding author. Tel.: +1-843-349-6489. E-mail address: dhuang@coastal.edu

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of NICOM8 Chairpersons 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of NICOM8 Chairpersons

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of NICOM8 Chairpersons 10.1016/j.prostr.2025.06.009