Ladybugs, only 4 to 9 mm long, often almost go unnoticed and yet they are extremely important insects. They are known to bring good luck but they are also very useful creatures in the biological fight against pests such as aphids and mealybugs that are their most important sources of nourishment. Ladybugs protect plants and help them grow, thereby contributing in a significant way to keeping a balance in Nature.
By looking only at the surface, it is impossible to plan useful and qualified concrete renovation. Only an in-depth analysis and microscopic examination of the concrete of the tanks can allow us to provide our clients with detailed structural analyses before intervening with an optimized work plan.
We also offer the structural analysis of concrete elements of wastewater treatment plants as a standalone service. Design centres and private as well as public clients often turn to us for this service. According to the laws in force regarding the public sector, in Germany, before starting the renovation of any statically important concrete structure, a so-called ‘expert planner’ must be called in to renovate the concrete. Experts of this kind not only have to obtain special professional qualification but also additional training with a final exam. To renew their qualification they must attend periodic refresher programs every three years. At Krumme, this classroom training is enriched by over 20 years of practical experience in the field of concrete renovation.
A wet coring drill on a support stand is used to extract samples then used for lab analysis.
Complete visual inspection of the concrete’s conditions and documentation of the structures to be analysed
Measurement of visible fissures and cracks
A small area of the reinforcement is exposed to reveal the conditions and distribution of the rebar structures inside the concrete
Inspection of the conditions and measurement of the diameter of the rebars and of the thickness of the concrete cover (data used to program the scanner)
Scanner programming and non-destructive measurement of the rebars inside the structures using a linear and/or surface scanner
Measurement of the degree of carbonation via phenolphthalein testing in the areas around the exposed rebar
Core drilling (here in especially difficult conditions)
Execution of tensile strength tests by our specialised staff using electronically calibrated equipment to measure the resistance of concrete surfaces
Measurement of tensile strength
Results: documentation of the concrete’s tear resistance via analysis of the sample’s surface
Detailed photographic documentation of all phases
Delivery of samples to a specialised and qualified laboratory for further testing
All of the information obtained in this way is summarised in a detailed report on the test results and, as a special service, explained on site by our expert planner. In this manner we create the premises for qualified renovation.
Although no major critical issues have been found, concrete analysis has provided a wide and detailed picture of the damage present.
This is confirmed when the concrete is removed.
Concrete analysis has shown that it should have been renovated with different intensity in the various sections.
Concrete analysis is fundamental for state-of-the-art renovation of wastewater treatment tanks.
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