Investigation and Practical Application of Silica Nanoparticles Composite Underwater Repairing Materials

Jingbiao Yang, Shengxiang Deng, Hui Xu, Ye Zhao, Changda Nie and Yongju He
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Jingbiao Yang: School of Materials Science and Engineering, Central South University, Changsha 410083, China
Shengxiang Deng: School of Mechanical and Automobile Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
Hui Xu: Lab of Nano-Biology Technology, Institute of Super-Microstructure and Ultrafast Process in Advanced Materials, School of Physics and Electronics, Central South University, Changsha 410083, China
Ye Zhao: School of Energy Science and Engineering, Central South University, Changsha 410083, China
Changda Nie: School of Energy Science and Engineering, Central South University, Changsha 410083, China
Yongju He: Lab of Nano-Biology Technology, Institute of Super-Microstructure and Ultrafast Process in Advanced Materials, School of Physics and Electronics, Central South University, Changsha 410083, China

Energies, 2021, vol. 14, issue 9, 1-10

Abstract: Repairing materials are well-known to play an important role in rehabilitating and extending the service life for hydraulic concrete structures. However, current underwater repairing materials possess several problems, including insufficient bond tensile strength, inconsistency with the deformation of the old substrate, and insufficient underwater self-sealing ability. In the present paper, an experimental study was carried out to evaluate the influence of silica nanoparticles (SNs) on the properties of underwater composite-repairing materials. The underwater deformation, impermeability, bond tensile strength, and compressive strength of the SN-modified underwater composite-repairing materials were used as the properties’ evaluation indices. The results show that, within a certain range, the performance of the repairing material increase with increased SN percent. The deformability, impermeability grade, underwater bond tensile strength, and compressive strength of the SN-modified composite underwater repairing materials are 2.2%, 8, 2.91 MPa, and 115.87 MPa, respectively, when the mass ratio of the mortar, the curing agent and the SNs is 8:1:0.002. The proposed material is employed to repair the dam for a hydropower station in Guizhou province, China. Results show the seepage discharge is reduced by 8.6% when the dam is repaired. The annual average generating capacity is increased by 1.104 × 10 5 kWh. Meanwhile, CO 2 and NOx emissions are reduced by 1.049 × 10 5 and 220.8 kg annually, respectively.

Keywords: underwater repairing materials; silica nanoparticles; optimum mass ratio; economic analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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