Porosity, Pore Size Distribution and Chloride Permeability of Shotcrete Modified with Nano Particles at Early Age

Author

Hedong Li
Dongming Yan
Genda Chen, Missouri University of Science and TechnologyFollow
Shilang Xu
Jintao Liu
Yanjia Hu

Abstract

Nano particles have been found to be effective in enhancing many properties of regular concretes. However, there is little information on the effect of nano particles on shotcrete. In fact, if similar positive effect of nano particles can also appear in shotcrete, they will greatly benefit the wide application of shotcrete in more and more repair and strengthening of structures in civil engineering, especially in corrosive environments. In this study, through experiments on 70 specimens, the effects of nano SiO₂, CaCO₃ and Al₂O₃ particles on the early-age porosity, pore size distribution, compressive strength and chloride permeability of shotcrete were investigated.Test results indicated that nano SiO₂ particles significantly increased the compressive strength and chloride penetration resistance; nano Al₂O₃ and CaCO₃ particles had slight enhancing effect on the compressive strength; nano CaCO₃ particles were most effective in promoting the chloride penetration resistance of shotcrete. As a conclusion, nano SiO₂ particles were recommended when both early age compressive strength and chloride penetration resistance were crucial, and nano CaCO₃ particles were recommended when only chloride penetration resistance was concerned for their high cost-effectiveness.

Recommended Citation

H. Li et al., "Porosity, Pore Size Distribution and Chloride Permeability of Shotcrete Modified with Nano Particles at Early Age," Journal of Wuhan University of Technology (Materials Science Edition), vol. 31, no. 3, pp. 582 - 589, Wuhan Ligong Daxue, Jun 2016.

The definitive version is available at https://doi.org/10.1007/s11595-016-1413-9

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Chloride Penetration Resistance; Compressive Strength; Nanoparticles; Porosity; Shotcrete; Aluminum; Calcium Carbonate; Chlorine Compounds; Cost Effectiveness; Hardness; Pore Size; Size Distribution; Chloride Permeability; Corrosive Environment; Early Age; Enhancing Effect; Nano- SiO; Nano-CaCO; Repair And Strengthening; Compressive Strength

International Standard Serial Number (ISSN)

1000-2413

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2016 Wuhan Ligong Daxue, All rights reserved.

Publication Date

01 Jun 2016