Assessment of test methods for characterizing the hydrophobic nature of surface-treated High Performance Concrete

Journal article

Authors / Editors

Bader, Tobias

Research Areas

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Publication Details

Author list: Weisheit S, Unterberger SH, Bader T, Lackner R

Publisher: Elsevier

Place: OXFORD

Publication year: 2016

Journal: Construction and Building Materials (0950-0618)

Journal acronym: CONSTR BUILD MATER

Volume number: 110

Start page: 145

End page: 153

Number of pages: 9

ISSN: 0950-0618

Languages: English-Great Britain (EN-GB)

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Abstract

The durability of concrete and concrete structures is significantly influenced by environmental conditions, resulting in e.g. the ingress of water and incorporated aggressive agents, with the latter being responsible for initiating and progress of deterioration processes within the material system. In order to reduce the ingress of water, water repellent agents are applied onto the concrete surface (surface treatment), with its performance strongly depending on the agent itself, the mode of application, environmental conditions etc. For the assessment of the performance of surface-treated concrete, standard test methods, such as Karsten-Tube penetration test, contact angle measurement, hydrophobic quality test, as well as more refined test methods, such as Infrared Spectroscopy (IR), moisture sorption analysis, and scanning electron microscopy coupled with elemental X-ray analysis (SEM/EDS) are used. These methods are commonly employed for the assessment of surface-treated ordinary concrete, leaving the question on their applicability to material systems exhibiting a denser microstructure, such as High Performance Concrete (HPC), unanswered. Within this experimental study, the aforementioned test methods are critically reviewed regarding their potential application to HPC, finally providing recommendations for evaluating the performance and durability of water-repellent surface treatment when applied to HPC. (C) 2016 Elsevier Ltd. All rights reserved.

Keywords

Contact angle, High Performance Concrete, Hydrophobic treatment, SEM/EDS, Silane, Siloxane, Spectroscopy, Water repellent

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