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Petrographic Analysis for Wind Turbines
The foundation support of a wind turbine is an application-critical factor often overlooked or under-valued. Lucideon evaluates the quality of workmanship and materials in installed concrete support and containment systems, such as wind turbine bases, piers, roads, support columns and containment areas.
Are any flaws present that might reduce the life-expectancy of the concrete?
- If degradation is present, is it cosmetic or structural in nature?
- Can the concrete be repaired?
- What repair materials and procedures should be used?
- What are the root causes(s) for premature degradation?
Investigation reports include high-quality imaging, metallographic optical microscopy examination, Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, and additional wet chemical analytical technique results, detailed observations and interpretation of results. A basic petrographic analysis includes the following test methods. Additional test methods may be recommended for your specific investigation needs.
- Petrographic analysis (ASTM C856)
A microstructural examination by optical and scanning electron microscopy (SEM) of the paste and aggregate on a prepared sample of concrete to look for features such as degree of cement hydration, microcracking, reaction products, breakdown of aggregate and evidence of poor freeze-thaw performance. SEM backscatter images and energy dispersive spectroscopy spectra are recorded to document the appearances and compositions of features of interest. A mineralogical assessment of the aggregate is also performed to determine if appropriate aggregate was used and if it caused any deleterious reactions.
- Air void analysis (ASTM C457)
Performed on polished core cross-sections, this analysis provides detailed information about the relative composition and distribution of coarse and fine aggregate, cement paste, entrained and entrapped air.
- Uranyl-Acetate method (ASTM C856)
Detection of the presence of detrimental Alkali-Silica Reactions (ASR) may be performed to validate a root cause for premature degradation.
- FTIR analysis
Utilized to identify contaminants and verify the composition of binders, epoxies, coatings, and other organic materials.
- Petrographic analysis of natural stone (BS EN 12407)
Microscopic examination of macro and micro samples enables rock types to be described according to recognized standards and terminology (BS EN 12670) and defined. From the petrographic examination and knowledge of the origin of the stone, denomination criteria can be assigned (BS EN 12440). This provides an unambiguous definition of the stone.