Evaluation of the contact angle and wettability of hydrophobised lightweight concrete with sawdust

Małgorzata Szafraniec

m.szafraniec@pollub.pl
Faculty of Civil Engineering and Architecture; Lublin University of Technology; (Poland)
https://orcid.org/0000-0002-5862-9456

Danuta Barnat-Hunek


Department of Construction; Faculty of Civil Engineering and Architecture; Lublin University of Technology; (Poland)
https://orcid.org/0000-0001-8409-3299

Abstract

The aim of the research presented in the paper was to evaluate the feasibility of using hydrophobic preparations based on organosilicon compounds for protection treatment on the lightweight concrete modified with sawdust. The experimental part of the work concerns the physical and mechanical properties of lightweight concrete and the influence of two hydrophobic agents on the contact angle of the material. Lightweight concrete contact angle (θw) was determined as a time function using one measuring liquid. Water repellent coatings in lightweight concrete structure with the coarse aggregate sawdust (CASD) using electron microscopy were presented. The effectiveness of hydrophobisation of porous lightweight concretes was determined on the basis of the research. For the hydrophobic surface, the contact angle decreased and it depended on the used agents. The lowest contact angle of 40.2° (t=0) was obtained for reference concrete before hydrophobisation and 112.2° after hydrophobisation with a methyl-silicone resin based on organic solvent. The results of scientific research confirm the possibility to produce lightweight concretes modified with CASD with adequate surface protection against external moisture.

Supporting Agencies

This work was partially financially supported by the Polish Ministry of Science and Higher Education within the statutory research numbers FN14/ILT/2019.

Keywords:

sawdust, lightweight aggregate-concrete, organosilicon compounds, hydrophobisation, contact angle

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Published
2020-06-30

Cited by

Szafraniec, M. and Barnat-Hunek, D. (2020) “Evaluation of the contact angle and wettability of hydrophobised lightweight concrete with sawdust”, Budownictwo i Architektura, 19(2), pp. 019–031. doi: 10.35784/bud-arch.1644.

Authors

Małgorzata Szafraniec 
m.szafraniec@pollub.pl
Faculty of Civil Engineering and Architecture; Lublin University of Technology; Poland
https://orcid.org/0000-0002-5862-9456

Authors

Danuta Barnat-Hunek 

Department of Construction; Faculty of Civil Engineering and Architecture; Lublin University of Technology; Poland
https://orcid.org/0000-0001-8409-3299

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