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Polymers 2015, 7(11), 2389-2409; doi:10.3390/polym7111520

Stable Failure-Inducing Micro-Silica Aqua Epoxy Bonding Material for Floating Concrete Module Connection

1
School of Civil and Environmental Engineering, Yonsei University, Concrete Structural Engineering Laboratory, Seoul 03722, Korea
2
Korea Institute of Civil Engineering and Building Technology Structural Engineering Research Institute, Goyang-Si, Gyeonggi-Do 10223, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Walter Remo Caseri
Received: 1 June 2015 / Revised: 22 September 2015 / Accepted: 29 October 2015 / Published: 24 November 2015

Abstract

Many recent studies in the development of floating concrete structures focused on a connection system made of modules. In the connection system, the modules are designed to be attached by pre-stressing (PS) while floating on the water, which exposes them to loads on the surface of the water. Therefore, the development of a pre-connection material becomes critical to ensure successful bonding of floating concrete modules. Micro-silica mixed aqua-epoxy (MSAE) was developed for this task. To find the proper MSAE mix proportion, 0% to 4% micro-silica was mixed in a standard mixture of aqua-epoxy for material testing. Also, the effect of micro-silica on the viscosity of the aqua epoxy was evaluated by controlling the epoxy silane at proportions of 0%, ±5%, and ±10%. After completion of the performance tests of the MSAE, we evaluated the effect of MSAE in a connected structure. The plain unreinforced concrete module joint specimens applied with MSAE at thicknesses of 5, 10, and 20 mm were prepared to be tested. Finally, we evaluated the performance of MSAE-applied reinforced concrete (RC) module specimens connected by PS tendons, and these were compared with those of continuous RC and non-MSAE-applied beams. The results showed that the mix of micro-silica in the aqua-epoxy changed the performance of the aqua-epoxy and the mix ratio of 2% micro-silica gave a stable failure behavior. The flexural capacity of concrete blocks bonded with MSAE changed according to the bond thickness and was better than that of concrete blocks bonded with aqua-epoxy without micro-silica. Even though MSAE insignificantly increases the load-carrying capacity of the attached concrete module structure, the stress concentration reduction effect stabilized the failure of the structure. View Full-Text
Keywords: floating structure; micro-silica mixed aqua-epoxy (MSAE); concrete module floating structure; micro-silica mixed aqua-epoxy (MSAE); concrete module
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kim, J.-H.J.; You, Y.-J.; Jeong, Y.-J.; Choi, J.-H. Stable Failure-Inducing Micro-Silica Aqua Epoxy Bonding Material for Floating Concrete Module Connection. Polymers 2015, 7, 2389-2409.

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