Researches

Experimental study on flexural behaviors of engineered cementitious composite beams reinforced with FRP bars

The use of FRP reinforcement has attracted great attention in concrete structures due to its high tensile strength, good fatigue performance, and especially inherent anti-corrosion ability. Engineered cementitious composite (ECC) is a class of high performance cementitious composites with pseudo strain-hardening and multiple cracking properties. Substitution of concrete with ECC can avoid the cracking and durability problems from weakness of concrete.

Necessary rock studies of the gabbro and andesite basalt groups for the suitability as the raw material base for the production of continuous basalt fiber (CBF). A unique technique including laboratory melting and pilot-industrial melting at the high-tech equipment.

In this paper, a kind of FRP reinforced ECC beam is proposed to obtain super high durability and better mechanical performance compared with normal steel reinforced concrete beam. Six FRP reinforced ECC or ECC/concrete composite beams with various longitudinal and transverse reinforcement ratios and ECC thicknesses have been tested. According to the test results, FRP reinforced ECC beams show
better flexural properties in terms of load carrying capacity, shear resistance, ductility, and damage tolerance compared with FRP reinforced concrete beams.

For the FRP reinforced ECC beam without stirrups, although it finally fails in shear mode, its flexural load capacity and ultimate deformation are comparable to the FRP reinforced concrete beams with proper designed stirrups, and the failure process is ductile due to strain hardening behavior of ECC materials. For ECC/concrete composite beams, partially application of ECC can lead to considerable increase of load capacity, energy dissipation. When the ECC layer is placed in the tension zone, the crack width along the beam can be well controlled, and hence high residual strength and stiffness of the composite beam can be expected.

F. Yuan, Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education
School of Civil Engineering, Southeast University, Nanjing, China

J.L. Pan, Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education
School of Civil Engineering, Southeast University, Nanjing, China

Companies: Mechanical Properties

Countries: China

Industries: Energy

Terms: Composite materials

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