Evaluation of the Mechanical Properties of Self-Compacting Lightweight Concrete Exposed to Wet and Dry Cycles in Saltwater

Abstract:

In this paper, properties of a self-compacting lightweight concrete that has been exposed to cycles of wetting in saltwater and drying in air are investigated. Such exposure conditions are common in marine structures with pronounced sea level variation. The experimental program consisted of two phases; Phase I included monitoring of the strength development for 28 days, while in Phase II samples were exposed to wet/dry cycles for 12 months. In addition, control samples were kept in room temperature without exposure for comparison. Compressive and flexural strength, modulus of elasticity and Rapid Chloride Penetration (RCP) were included in the investigation. In addition, Scanning Electron Microscopy (SEM) was conducted to examine the microstructure of the samples in phase II. Results from the experimental program indicate that there was a negligible effect on the mechanical properties or RCP due to the exposure conditions. However, a close inspection of the SEM images showed salt deposits and micro cracking in the cement paste. This may affect the long-term durability and can lead to deterioration of the concrete structure, hence reducing the structure’s service life.

• Periodical: Key Engineering Materials (Volume 711)
• Pages: 218-223
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.711.218
• Online since: September 2016
• Authors: Sherif Yehia*, Sharef Farrag
• Keywords: Dry Cycles, Lightweight, Mechanical Properties, Self-Compacting Concrete, Wet Cycles

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