Chloride ingress in cracked concrete
| Autor: | Thorsten Eichler, Branko Šavija, Erik Schlangen, Steven Millar, J. Pacheco Farias, Gerd Wilsch |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Aggregate (composite)
Materials science 0211 other engineering and technologies 02 engineering and technology Building and Construction 021001 nanoscience & nanotechnology Chloride Ion Cracking 021105 building & construction medicine General Materials Science Laser-induced breakdown spectroscopy Wetting Composite material Mortar 0210 nano-technology Beam (structure) medicine.drug |
| Zdroj: | Journal of Advanced Concrete Technology, 12 (10), 2014 |
| ISSN: | 1346-8014 |
| DOI: | 10.3151/jact.12.425 |
| Popis: | racks are always present in reinforced concrete structures. In the presented research, influence of mechanical cracks on chloride ingress is studied. A compact reinforced concrete specimen was designed, mimicking the cracking behaviour of beam elements. Cracks of different widths were induced by means of mechanical loading. These cracked specimens were then subjected to weekly cycles of wetting and drying with NaCl solution. After the exposure, the specimens were cut, and chloride distributions were determined using Laser Induced Breakdown Spectroscopy (LIBS), an innovative technique which enables simultaneous determination of different elements with high spatial resolution and minimal specimen preparation. By combining element distributions of different elements, it is possible to discriminate between coarse aggregate particles, and the mortar matrix. It was found that the wider the crack is, the higher the ingress of chloride ions. This was, however, different for two tested concrete mixes. Due to highly inhomogeneous chloride distribution around the cracks, use of fine-scale experimental techniques for chloride mapping is advised, based on the presented study. |
| Databáze: | OpenAIRE |
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