Abstract
Seawater sea sand concrete (SWSSC) is a promising alternative to ordinary concrete in terms of saving valuable natural resources of freshwater and river sand. Basalt fiber reinforced polymer (BFRP) rebars can be a good solution to corrosion of steel rebars in SWSSC. This paper presents an experimental study on the bond behavior between SWSSC and BFRP rebars through pullout testing. Concrete mixed with freshwater and river sand was also prepared for comparison with SWSSC. BFRP rebars with two different surface configurations were selected, that is, ribbed surface and sand-coated surface. Fly ash as a replacement of cement was also investigated in terms of its effect on bond behavior. Failure modes, bond-slip relationships, and bond strengths were reported and discussed in terms of the previously mentioned parameters. It was found that ribbed surface of BFRP rebar could achieve better mechanical interlocking with surrounding concrete. SWSSC could have comparative bond strength with BFRP rebar compared with ordinary concrete. However, using fly ash to replace cement is not recommended because it would significantly reduce concrete strength leading to much lower bond at the interface between SWSSC and BFRP rebar.
Highlights
Global concrete construction consumes great amount of freshwater and river sand, which represent valuable natural resources and are expected to become short by 2050 [1]
It is reported that seawater and sea sand to mix concrete (SWSSC) can achieve similar mechanical properties to ordinary concrete mixed with freshwater and river sand [3, 4]
In order to address this knowledge gap, this paper presents an experimental study on the bond behavior between Basalt fiber reinforced polymer (BFRP) and SWSSC through pullout testing
Summary
Global concrete construction consumes great amount of freshwater and river sand, which represent valuable natural resources and are expected to become short by 2050 [1]. It will not be economical to use freshwater and river sand for concrete construction considering significant transportation cost Motivated by these concerns, using seawater and sea sand to mix concrete (SWSSC) is a promising alternative to ordinary concrete [1,2,3]. Replacing cement with fly ash is not desirable due to significant reduction in bond strength between SWSSC and BFRP rebars.
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