Thin Protective Layers Made out of Special Concretes

Abstract:

All concrete and reinforced concrete engineering structures degrade over time when they are exposed to the surrounding environment. In particular, the concrete protective layer of reinforcing steel is rapidly degraded, which can lead to failure of the structure. Adequate durability of concrete coatings must be taken into consideration. This property can be ensured by modifying the composition of the concrete mix. This can be done through the implementation of appropriate admixtures and additives into cement composites. This modification, called material and structural protection, can be used in the form of thin protective layers (TPL). They are intended to protect an ordinary concrete from external aggressions. Thin protective layers made out of special concrete will be presented in the article. The impact of three different thicknesses of protective layers on properties of cement composites was investigated. Special concrete was modified with silica fume, crushed granite aggregate and superplasticizer based on polycarboxylate. Thin protective layers are characterized by very good water resistance and resistance to freezing and thawing. The layer of special concrete with increased durability due to the reduced water/cement ratio, high cement content and by using additives and admixtures, should fully protect ordinary concrete against the negative influence of the aggressive environment.

• Periodical: Solid State Phenomena (Volume 259)
• Pages: 101-105
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.259.101
• Online since: May 2017
• Authors: Natalia Stankiewicz*, Michał Bołtryk
• Keywords: Special Concrete, Thin Protective Layers

References

[1] Czarnecki L., Emmons P. H. (2002) Repair and protection of concrete structures (in Polish). Polski Cement, Kraków.

[2] PN-EN 1504 Products and systems for the protection and repair of concrete structures (in Polish).

[3] Jasiczak J., Wdowska A., Rudnicki T. (2008) Ultra-high-performance concrete. Properties, technologies and applications (in Polish). Stowarzyszenie Producentów Cementu, Kraków.

[4] Łapko A., Grygo R. (2011) The concept of the production of prefabricated elements made with reinforced concrete enhanced with HPC inserts (in Polish). Materiały Budowlane. 2/2011, pp.28-29.

[5] Cauberg N., Piérard J., Remy O. (2008) Ultra high performance concrete: mix design and practical applications. Tailor Made Concrete Structures: New Solutions for our Society, Taylor & Francis, London, pp.1085-1087.

DOI: 10.1201/9781439828410.ch180

[6] PN-EN 12390-3: 2011 Concrete testing - Part 3: Compressive strength of test samples (in Polish).

[7] PN-EN 12390-8: 2011 Concrete testing - Part 8: The depth of penetration of water under pressure (in Polish).

[8] PN-88/B-06250 Ordinary concrete (in Polish).

[9] PN-EN 1338: 2005 Concrete paving blocks - Requirements and test methods (in Polish).

[10] PN-EN 13877-2: 2013-08 Concrete surfaces - Part 2: Functional requirements for concrete surfaces (in Polish).