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BULK HYDROPHOBIC STRUCTURAL CONCRETE FOR USE IN NORDIC CONDITIONS - INITIAL STUDY
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering. RISE Research Institutes of Sweden AB.ORCID iD: 0000-0001-7820-4052
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.ORCID iD: 0000-0002-1526-9331
Cementa AB.
RISE Research Institutes of Sweden AB.
2017 (English)In: 8th International Conference on Water Repellent Treatment and Protective Surface Technology for Building Materials (Hydrophobe VIII), Hong Kong, December 7-9, 2017., Hong Kong, 2017Conference paper, Published paper (Other academic)
Abstract [en]

Reinforced concrete is a universal composite product available globally. The ability to shape and cast concrete to fit the needs of the end user at a relatively low cost is its main advantage. The service life of a reinforced concrete structure can be over 100 years. Concrete and the embedded steel though can degrade over time due to frost damage, chloride induced corrosion, alkali silica reaction etc. Costly repairs and social inconvenience are often the consequence. External mass flow of water through defects in the concrete or in the concrete’s pore structure is a leading cause of material breakdown of the cement paste or reinforcement bars. The reduction of this flow would be beneficial as this has the potential to hinder the transport of undesired ions such as chlorides or sulphates into the cement paste. In Justnes [1] various chemicals were summarized and demonstrated as having hydrophobic or damp proofing properties in concrete, in particular vegetable oils at an application 1.5% of cement weight with a water to cement ratio of 0.5. This paper will also extend beyond that limit for bulk hydrophobic agents in concrete in reducing water permeability and diffusion of external chlorides within this composite material. The resulting fresh and hardened properties will also be evaluated. Finally, the most effective concretes will then be exposed to real life external environments, such as a Nordic tunnel, over several years. The study is in its infancy and so preliminary results will be presented.

Place, publisher, year, edition, pages
Hong Kong, 2017.
Keywords [en]
Hydrophobe, Concrete, Mortar, Water Absorption, Bulk
National Category
Other Materials Engineering
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-255662OAI: oai:DiVA.org:kth-255662DiVA, id: diva2:1340604
Conference
8th International Conference on Water Repellent Treatment and Protective Surface Technology for Building Materials (Hydrophobe VIII), Hong Kong, December 7-9, 2017.
Funder
Swedish Transport Administration, 2017/57524Rock Engineering Research Foundation (BeFo), 383
Note

QC 20190812

Available from: 2019-08-06 Created: 2019-08-06 Last updated: 2019-08-19Bibliographically approved

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