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MACRO PORE CONTENT IN WET-SPRAYED CONCRETE CHARACTERIZED BY CT SCANNING

Abstract

This study aims to measure the air content in sprayed concrete specimens using CT scanning. Macro
pores can influence mechanical, permeability, and thermophysical properties of sprayed concrete.
Concrete panels were sprayed using full-scale equipment with a 7% alkali-free accelerator (by
equivalent binder mass), with distances (1.5 m, 2.5 m, 3.5 m) and angles (90 deg, 67 deg, and 45 deg)
from the nozzle to the application surface. After hardening, cores were drilled (100 mm diameter x
150 mm height) and scanned by a Zeiss Metrotom 1500 CT scanner. To limit scanning errors, a region
of interest (ROI) of 85 mm x 150 mm was selected from each core, and macro pore content was
analyzed by VGStudio Max 3.0 software. The results show total macro void contents and shape
characteristics of macro-voids. The CT scanning result depends on the resolution, and macro pore
content results are compared with those measured by image analysis on polished surfaces and by PF-test.

Category

Academic chapter

Language

English

Author(s)

  • Iman Asadi
  • Nicholas Henry Trussell
  • Magne Stangeland Hårr
  • Gaute Kjeka
  • Pål Erik Endrerud
  • Eivind Grøv
  • Stefan Jacobsen

Affiliation

  • SINTEF Community / Infrastructure
  • Norwegian University of Science and Technology

Year

2022

Publisher

fib

Book

Proceedings of the 6th fib International Congress, June 12-16, 2022, Oslo, Norway

ISBN

9782940643158

Page(s)

399 - 407

View this publication at Norwegian Research Information Repository