Use of non-destructive tests to explain manifested pore structure changes in cryogenic concrete

Reginald Kogbara, Srinath Iyengar, Z. C. Grasley, D. G. Zollinger, E. A. Masad

Research output: Contribution to journalConference article

Abstract

The pore structure serves as a transport medium for external agents that cause concrete deterioration and controls the main properties of concrete. This work utilized non-destructive tests to explain pore structure changes in concrete assessed for direct liquefied natural gas (LNG) containment. It sought to investigate concrete mixture designs that are least susceptible to internal damage during cryogenic cooling. Concrete specimens were prepared using limestone and trap rock as coarse aggregates and river sand as fine aggregate. The effect of air-entrainment was also considered. Microcracking in the concrete specimens was monitored using coupled acoustic emission (AE) sensors during cryogenic cooling and warming. While proton nuclear magnetic resonance (NMR) measurements and x-ray computed tomography (XRCT) imaging were conducted on the specimens before and after the temperature swings. The manifestation of pore structure changes was assessed using water and 'chloride permeability' tests. Significant microcracking and changes in NMR porosity and mean pore size, and CT-calculated porosity corresponded to changes in water permeability trend but not 'chloride permeability' trend. Air entrainment caused a reduction in chloride penetrability. The results show the utility of the non-destructive tests in explaining pore structure changes in cryogenic concrete and identifies the damage-resistance potential of the concrete mixtures.

Original languageEnglish
Article number122003
JournalIOP Conference Series: Materials Science and Engineering
Volume431
Issue number12
DOIs
Publication statusPublished - 15 Nov 2018
Event14th International Conference on Concrete Engineering and Technology, CONCET 2018 - Kuala Lumpur, Malaysia
Duration: 8 Aug 20189 Aug 2018

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Pore structure
Cryogenics
Concretes
Chlorides
Air entrainment
Microcracking
Concrete mixtures
Nuclear magnetic resonance
Porosity
Magnetic resonance measurement
Cooling
Water
Calcium Carbonate
Acoustic emissions
Limestone
Liquefied natural gas
Pore size
Tomography
Deterioration
Sand

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

Cite this

Use of non-destructive tests to explain manifested pore structure changes in cryogenic concrete. / Kogbara, Reginald; Iyengar, Srinath; Grasley, Z. C.; Zollinger, D. G.; Masad, E. A.

In: IOP Conference Series: Materials Science and Engineering, Vol. 431, No. 12, 122003, 15.11.2018.

Research output: Contribution to journalConference article

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