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Bulk hydrophobic civil engineering concrete for nordic conditions – Freeze thaw action
RISE - Research Institutes of Sweden, Built Environment, CBI Swedish Cement and Concrete Research Institute.
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Built Environment, CBI Swedish Cement and Concrete Research Institute.ORCID iD: 0000-0002-5901-1586
Cementa AB, Sweden.
2019 (English)In: Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures, International Federation for Structural Concrete , 2019, p. 2044-2051Conference paper, Published paper (Refereed)
Abstract [en]

Concrete is a composite building material which long term function can be modified for example by changing the water to cement ratio (w/c) or by adding in other chemical admixtures to change the fresh and hardened properties of the concrete. The overall goal of this study is to reduce the water absorption capacity of the cement paste/microstructure by at least 85 %. This is achieved by using bulk hydrophobic agents in the mixing phase rather than post hardened surface application. Numerous commercial agents and triglycerides (vegetable oils) were tested and showed promising results at a dosage equal to 3% of cement weight. This though affected compressive strengths negatively. As these concretes will be exposed to Nordic winter conditions, the concrete should perform well under repeated salt water freezing and thawing. This continued study will show how a selection of these bulk hydrophobic concretes performed during this part of the study. The concrete has a w/c = 0.4 with a cement content (CEM I) of 430 kg/m3.

Place, publisher, year, edition, pages
International Federation for Structural Concrete , 2019. p. 2044-2051
Keywords [en]
Air pores, Bulk hydrophobic concrete, Freeze thaw action, Silanes, Thin section analysis, Triglycerides, Vegetable oils, Cements, Compressive strength, Concrete additives, Freezing, Hardening, Hydrophobicity, Thawing, Water absorption, Composite building materials, Freeze thaw actions, Fresh and hardened properties, Thin section, Water absorption capacity, Water-to-cement ratios, Concretes
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-38967Scopus ID: 2-s2.0-85066107127ISBN: 9782940643004 (print)OAI: oai:DiVA.org:ri-38967DiVA, id: diva2:1324642
Conference
fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures, 27 May 2019 through 29 May 2019
Note

 Funding details: Bundesamt für Berufsbildung und Technologie; Funding details: Stiftelsen Bergteknisk Forskning; Funding text 1: The authors would like to thank BBT (Swedish Transport Agency) and BeFo (Rock Engineering Research Foundation) for their continued financial support.

Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2019-08-13Bibliographically approved

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Gram, Annika

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