Publication detail

Research on the distribution law of coarse aggregate and pore structure in MWCNTs modified shotcrete

Pan, G. Li, CK. Laznovsky, J. Zikmund, T. Oberta, P. Kaiser, J. Li, PC. Chen, LJ.

Original Title

Research on the distribution law of coarse aggregate and pore structure in MWCNTs modified shotcrete

Type

journal article in Web of Science

Language

English

Original Abstract

This paper aims to investigate the variation rule of coarse aggregate and pore structure of shotcrete by adding MWCNTs. In the paper, X-ray computed tomography scans are used to study the coarse aggregate distribution and pore structure of the preparation of shotcrete, high-temperature curing shotcrete and shotcrete with MWCNTs. The distribution pattern of coarse aggregate and pore of shotcrete is obtained. The results show that: the coarse aggregate loss of shotcrete is serious within 30 mm from the wall and the coarse aggregate increases significantly in 30-70 mm. The addition of 0.03% MWCNTs increased the coarse aggregate of shotcrete by 36.63% and the volume of coarse aggregate by 25.64%. The largest increase is in coarse aggregates of 5-7 mm. This show that MWCNTs can improve mortar adhesion and reduce aggregate rebound. The number of shotcrete pores decreases with the increase of pore diameter. The proportion of small pores is up to 85%, the proportion of large pores is only 2%, but the volume of large pores reaches 87%. The addition of 0.03% MWCNTs can reduce the number of small pores in the shotcrete and reduce the mean pore diameter, resulting in a decrease in the porosity of the shotcrete. When the curing temperature is 80degree celsius, the porosity of shotcrete increases, and the pores decrease due to interconnection. The pores around the coarse aggregate account for over 70% of the total porosity, with pores larger than 1 mm accounting for 75%. This paper has a good reference value for the development of shotcrete and the selection of coarse aggregate in the actual working conditions.

Keywords

CT scan; Shotcrete; Coarse aggregate; Porosity; MWCNTs

Authors

Pan, G.; Li, CK.; Laznovsky, J.; Zikmund, T.; Oberta, P.; Kaiser, J.; Li, PC.; Chen, LJ.

Released

3. 5. 2024

Publisher

ELSEVIER SCI LTD

Location

London

ISBN

1879-0526

Periodical

CONSTRUCTION AND BUILDING MATERIALS

Year of study

426

Number

135805

State

United Kingdom of Great Britain and Northern Ireland

Pages count

9

URL

https://www.sciencedirect.com/science/article/pii/S0950061824009462?via%3Dihub

BibTex

@article{BUT188877,
  author="Pan, G. and Li, CK. and Laznovsky, J. and Zikmund, T. and Oberta, P. and Kaiser, J. and Li, PC. and Chen, LJ.",
  title="Research on the distribution law of coarse aggregate and pore structure in MWCNTs modified shotcrete",
  journal="CONSTRUCTION AND BUILDING MATERIALS",
  year="2024",
  volume="426",
  number="135805",
  pages="9",
  doi="10.1016/j.conbuildmat.2024.135805",
  issn="1879-0526",
  url="https://www.sciencedirect.com/science/article/pii/S0950061824009462?via%3Dihub"
}