Abstract
In this paper, the mechanical properties of coral concrete with different strength and different polyvinyl alcohol (PVA) fiber content under compression were experimentally investigated. The results show that adding an appropriate amount of PVA fiber could obtain satisfactory mechanical properties of coral concrete. The stress–strain constitutive relationship of plain and PVA fiber-reinforced coral concrete was investigated by prism uniaxial compression test. The results shown that the incorporation of PVA fiber had a significant effect on limiting the development of concrete internal cracks, and effectively improved the mechanical properties of coral concrete after cracking, especially the toughness. Different constitutive models from previous research were used to describe the axial compressive stress–strain relationship of plain and PVA fiber-reinforced coral concrete, and a piecewise function model was finally selected which is most consistent with the experimental curve and its characteristic points. In addition, determination of critical parameters for the selected constitutive model was proposed, and experimental validations confirmed its accuracy.
Highlights
In recent years, many countries have increased their investment in ocean engineering in response to the increasing depletion of land resources
Inventing a new kind of concrete with the best use of coral resources becomes a potential approach in off-shore islands and reef engineering construction
Many researches have been conducted on the mix proportion, strength and durability of coral concrete [6,7]
Summary
Many countries have increased their investment in ocean engineering in response to the increasing depletion of land resources. Inventing a new kind of concrete with the best use of coral resources becomes a potential approach in off-shore islands and reef engineering construction. Dempsey [1] and Narver [2] described the configuration requirements of coral concrete, and evaluated the coral concrete buildings. On some islands, such as Midway, Wake and Bikini, coral concrete was used to build airports and roads, and some of them are still in service [3]. In 2015, Yuan [5] prepared high performance coral concrete with strength up to 60 MPa using fly ash and slag instead of part of P·II52.5 ordinary Portland cement in the mix proportion of coral concrete. As the constitutive relationship of concrete is one of the most important factors that determine the servicing capacity of concrete engineering structures, the existing research results of coral concrete are still not enough for detailed engineering application or performance-based engineering design, and further research is needed
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