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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Investigation of Physical and Microstructural Changes in the Surface of Mortar Samples Exposed to Sulphuric Acid
Author(s): T. Schmidt, J. Neuenschwander, M. Romer, and T. Luthi
Publication: Special Publication
Appears on pages(s): 561-570
Keywords: degradation; leaky Rayleigh wave; mortar; sulfate attack; ultrasonics
Abstract:Deterioration processes on concrete structures are a result of an interaction between the concrete and its environment. In this project the mechanisms of deterioration due to chemical interaction of sulfate containing aqueous solutions are being investigated by a non destructive test method. It uses ultrasonic surface waves to investigate the topmost layer of mortar samples. A pitch and catch arrangement in immersion technique is used to generate the so-called leaky Rayleigh wave. A reduction of the measured sound velocity is proposed to be an indicator of the degradation of the surface region of the mortar sample. First measurements have been performed for reference mortar and for mortar samples exposed to aggressive conditions. A reduction of the velocity of the leaky Rayleigh wave of more than 5% could be detected. This physical alteration was compared and correlated with microscopical findings of the surface layer.
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