Detail publikace

Methodology of determination chlorides in cement matrix using collinear double-pulse laser-induced breakdown spectroscopy

KRATOCHVILOVÁ, L. PROCHAZKA, D. POŘÍZKA, P. KAISER, J.

Originální název

Methodology of determination chlorides in cement matrix using collinear double-pulse laser-induced breakdown spectroscopy

Typ

abstrakt

Jazyk

angličtina

Originální abstrakt

Reinforced concrete is the world's most used material for civil engineering. Concrete normally contains a small amount of chlorine which is strictly controlled by relevant standards. However, the total chloride content varies depending on conditions in different environments. Because of its porous structure, chloride ions can diffuse through concrete to steel reinforcement rods, which causes pitting corrosion. Pitting corrosion is one of the most common problems in reinforced concrete buildings and leads to a shortening of the lifetime of a building. The collinear double-pulse laser-induced breakdown spectroscopy (LIBS) was used for the experiment. LIBS is a fast analytical method and provides quick, almost real-time determination of different elements. Using a high-intensity laser pulse, the plasma is generated, and when it starts to cool down, the characteristic emission of elements is detected. It is so-called collinear, because two laser pulses have the same axis, and both are directed vertically to the sample surface. The detection of non-metallic elements, especially halogens such as chlorine, using LIBS is more complicated, because of the high excitation energy and low level of atomization in plasma. Another commonly used method how to determine chlorine content in concrete is potentiometric titration, which requires sample preparation. LIBS is a non-destructive method, which can be used in-situ, with minimal sample preparation. For the experimental part, we used two 1064 nm Nd:YAG lasers. Measuring was done in a helium atmosphere under atmospheric pressure because it provides the best signal-to-background ratio for an atomic chlorine line (Cl I 837.59 nm). After optimization the calibration curve was construed, and the limit of detection and the limit of quantification was calculated. Then we predicted the content of train samples and compared our results with reference values and XRF.

Klíčová slova

Chloride; LIBS; cement

Autoři

KRATOCHVILOVÁ, L.; PROCHAZKA, D.; POŘÍZKA, P.; KAISER, J.

Vydáno

4. 10. 2022

BibTex

@misc{BUT180642,
  author="Lucie {Kratochvilová} and David {Prochazka} and Pavel {Pořízka} and Jozef {Kaiser}",
  title="Methodology of determination chlorides in cement matrix using collinear double-pulse laser-induced breakdown spectroscopy",
  year="2022",
  note="abstract"
}