Ceramic Polymer:restoration of ensilage tank with Proguard CN-1M

BIELEFELD, Germany - May 2, 2016 - PRLog -- Heidelberg/Germany: The ensilage tank of a huge biogas plant showed extremely heavy concrete erosions due to high chemical attack from the fermentation material. The concrete substrate had to be refurbished urgently to ensure the functionality of the tank and prevent disastrous leakages. Henceforth, the product PROGUARD CN-1M protects the concrete reliably against chemical attack.

It is a fact; uncoated concrete does not suffice for long-term operation against chemical attack! Through the microbiological decomposition process and the acidic environmental conditions ensilage, biogas and biomass cause an extreme chemical load for the concrete substrate. A high performance coating is required to protect against serious concrete damage.

The ensilage tank showed advanced concrete erosions down to the steel reinforcement, induced by biogenic sulfuric acid attack (BSA). Thus, the steel was exposed to high corrosion risk; immediate action was required.

Technical details
Project: Refurbishment of a concrete tank for biogas ensilage
Size of the tank: Height of 5 m, diameter of 4.5 m
Storage medium: Renewable raw materials, manure, slurry with a pH-value of 4-5
Coating product: PROGUARD CN-1M
Application of the coating: K. H. Strohbeck GmbH & Co. KG, Kernen-Stetten/Germany

Firstly, the surface was grit blasted to remove loose concrete. Then the tank could be restored with conventional concrete grout.

Afterwards the walls were undercoated with the concrete-primer CP-SYNTHOFLOOR BETA 8016 and lightly sprinkled with quartz sand to achieve an anchorage profile for the protective coating.

The application of the high-grade chemically resistant coating PROGUARD CN-1M was conducted by airless spraying in a single layer with a thickness of 600 µm. One application procedure is enough to accomplish a reliable protection against aggressive chemical attacks and abrasion damages.

The further process within this extensive restoration was the floor treatment. The repaired concrete was also primed and sprinkled with quartz sand. In this area the product PROGUARD CN-1M was easily applied with a rubber squeegee.

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