Abstract
This study evaluated the performance of a hybrid panel in an improved moveable weir after exposure to accelerated environmental climate conditions. When exposed to a river environment, corrosion problems on improved moveable weir steel panels can occur. To address this, a hybrid panel with structure layering glass fiber-reinforced polymer (GFRP) panels on both sides of the steel panel was used. The steel was, therefore, not exposed to the outside. However, this hybrid panel is a structure that uses a mixture of two materials with different properties and there is the possibility of performance degradation when the GFRP composite material, i.e., the structure that wraps around the bond interface, and the steel panel are exposed to a river environment. Thus, we evaluated the durability of the hybrid panels by repeated exposure to long-term high temperatures, dry–wet environmental cycling, long-term freezing, and freeze–thaw cycling in an accelerated climate deterioration environment. In the flexural tests, the surface processing of the steel panel was shown to be important, with sand-blasted test specimens showing higher flexural strength. For the control specimens, the flexural strength decreased as the thickness of the GFRP panels increased. However, for the sand-blasted specimens, the flexural strength increased as the thickness of the GFRP panels increased. After exposure to accelerated climate deterioration, the flexural strength tests showed that the residual strength increased with panel thickness and that the residual strengths were greater for specimens incorporating sand-blasted steel panels. The results of our testing show that hybrid panels incorporating sand-blasted steel were adequate for use in improved moveable weirs.
Highlights
A weir installed across a river must contain the river and secure water resources under normal circumstances, enabling sufficient water to pass over the cross-sectional area in times of flooding [1,2,3,4].A fixed weir often causes overflow in the upper stream in times of flooding, which causes problems such as degraded river water flux due to soil accumulation
After exposure to accelerated climate deterioration, the flexural strength tests showed that the residual strength increased with panel thickness and that the residual strengths were greater for specimens incorporating sand-blasted steel panels
The bond strength between the steel panel and the glass fiber-reinforced polymer (GFRP) panels is an important factor in determining the bond characteristics and durability of a hybrid panel [1,7]
Summary
A weir installed across a river must contain the river and secure water resources under normal circumstances, enabling sufficient water to pass over the cross-sectional area in times of flooding [1,2,3,4]. It uses uses panels for all for parts air bag, concern regarding incorrosion a river environment steel all parts except the air bag, there regarding in steel panels panels for allexcept parts the except the so airthere bag,isso so there is is concern concerncorrosion regarding corrosion in aa river river as well as various other problems suchproblems as decreased with long-term uselong-term and possible environment as as other such as durability with use and environment as well well as various various other problems suchdurability as decreased decreased durability with long-term useriver and ecosystem damage due to the leakage of corrosive materials [1,5,6,7].
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