Shenzhen University

Jinan University

Xiaoxu Huang

Feng Xing

Yingwu Zhou

Biao Hu

Zhongfeng Zhu

Zenghui Ye

Zongjun Li

Zhenyu Huang

Youbin Lan

Wenhui Guo

Menghuan Guo

Rui Hu

A smart carbon fiber reinforced polymer (CFRP)-shape memory alloy (SMA) bar reinforced concrete structure integrating cathodic protection, force sensing, and bearing capacity self-adjustment is provided. A CFRP-wrapped composite bar with SMA embedded with an optical fiber in the smart CFRP-SMA bar reinforced concrete structure is both a concrete reinforced bar and an auxiliary anode for ICCP to prevent steel bars from being rusted. In addition, the SMA has an ability to adjust stress after excitation, and the embedded optical fiber can perceive a force condition of the composite bar. This structure system significantly improves durability of a concrete structure in a coastal environment, solves problems of in-service real-time bar sensing and bearing capacity control of the structure, and provides a new solution to performance degradation caused by deterioration of a CFRP anode in a traditional ICCP process.

Smart carbon fiber reinforced polymer-shape memory alloy bar reinforced concrete structure integrating cathodic protection, force sensing, and bearing capacity self-adjustment

The present disclosure relates to an optical-fiber-embedded and FRP-wrapped SMA composite bar with force sensing, stress driving, and structural reinforcement integrated. The surface of the plain round Fe-SMA bar is provided with a groove in advance for implantation of the sheathed optical cable such that the bar has a self-sensing function. The plain round Fe-SMA bar having a shape memory effect is used as a steel core, so it has the characteristic of self-tensioning; an FRP wrapping layer prevents corrosion of the plain round Fe-SMA bar used as the core and prevents fracture of the sheathed optical cable, thus improving the durability of a prestressed bar structures on the outer surface of the FRP wrapping layer may provide sufficient engaging force and anchoring effect, reducing loss of prestress due to friction and the like.

Optical-fiber-embedded and FRP-wrapped SMA composite bar with force sensing, stress driving and structural reinforcement integrated

Disclosed are a steel fiber composite intelligent bar with a sheathing optical cable embedded in an inner core of a rebar, and a fabrication method thereof. The steel fiber composite intelligent bar includes the sheathing optical cable, the rebar, a winding layer, and tightening sheaths, wherein the sheathing optical cable comprises a glass fiber core, a polyimide coating layer, and a polyurethane wrapping layer that are stacked sequentially from inside to outside; the rebar is provided with a notch groove along a length direction; and the sheathing optical cable is embedded in the notch groove in parallel; the winding layer is wound around an outer surface of the rebar, and the winding layer is made of an epoxy resin composite fiber; and the tightening sheaths comprise a first tightening sheath and a second tightening sheath which are sleeved at two ends of the winding layer, respectively.

Steel fiber composite intelligent bar with sheathing optical cable embedded in inner core of rebar, and fabrication method thereof

Disclosed are an alkali-activated geopolymer coating, and a preparation method and use thereof. The alkali-activated geopolymer coating, is prepared by raw materials including the following components: an aluminosilicate mineral, an alkali activator, and a performance additive; wherein the aluminosilicate mineral comprises fly ash, slag, and metakaolin; the performance additive comprises a polymer powder, titanium dioxide, a silicone defoamer, and a water-reducing admixture; and a mass ratio of the aluminosilicate mineral, the alkali activator, and the performance additive is in a range of 100:(60-80):(4-15).

Alkali-activated geopolymer coating, and preparation method and use thereof

The present disclosure relates to an optimization method and system for hybrid FRP and steel bars. The optimization method includes: determining a cross-sectional bending bearing capacity, a maximum cross-sectional bending bearing capacity, and a minimum cross-sectional bending bearing capacity according to basic material parameters and a design value of a bending moment; determining whether the cross-sectional bending bearing capacity, the maximum cross-sectional bending bearing capacity, and the minimum cross-sectional bending bearing capacity meet a first preset condition; if yes, determining a maximum steel bar area according to the basic material parameters; determining a maximum ductility of a steel bar beam; determining whether the maximum ductility and the target ductility meet a second preset condition; if yes, determining a minimum steel bar area and a maximum FRP bar area according to the maximum steel bar area; and determining an actual steel bar area and an actual FRP bar area.

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Guangdong, China

Xiaoxu Huang