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Experimental Research on the Influence of Interface Materials and Roughness on Shear Behavior of RC Beams Strengthened with High Performance Ferrocement Laminate

Author: ZhangRuiWen
Tutor: ShangShouPing
School: Hunan University
Course: Structural Engineering
Keywords: High performance Ferrocement network Superfine cement Interface agent Bond strength Roughness Reinforcement Shear
CLC: TU375.1
Type: Master's thesis
Year: 2008
Downloads: 73
Quote: 1
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Abstract


The existing building structures due to the influence of various factors can not meet the requirements of security bearer or normal use, the need for repair and reinforcement. High-performance composite mortar reinforced Network (HPFL) reinforcement method as a new method of reinforcement has many superior characteristics, increasingly favored by the engineering community. High-performance composite ferrocement strengthened RC beam commonly used on three sides of the U-shaped reinforcement, this reinforcement way often enough prone reinforcement layer due to the bond strength of the interface peeling, so that the reinforcement layer failure, the bearing capacity is greatly reduced. Taking into account the interfacial adhesion reinforcement layer with the original beam work, study first interface processing materials, the roughness of the surface of the old concrete, then test the shear behavior of RC Beams Strengthened specific content, including: 1 to study the different interface agent processing, high-performance composite mortar reinforced concrete members interfacial bond tensile strength and bonding shear strength and microstructure observation analysis of reinforced the mortar and grassroots concrete, interface at . The results show that: the favorable interface agent to improve the interfacial bond strength. Pure cement paste can not be used as interface agent. Silica fume, bulking agent and superplasticizer combination can effectively enhance the bond strength of the cement-based interface agent and control drying shrinkage cracking. Superfine portland cement instead of ordinary portland cement, cement-based interface agent, adhesive tensile strength can be increased by 60% after 28 days strength is basically stable. Roughness measurement interface processing innovation on the basis of the commonly used sand replacement method created wipe sand method, the method is simple, fast and efficient, can more accurately reflect the level of the erection of the inclined surface of the member the roughness of the interface processing in this method of measurement based on the roughness of the classification, which is divided into three roughness level. 3, designed 12 high-performance composite mortar steel mesh reinforcement beams and a comparison beam at room temperature shear test. Reinforcement beams using three-sided U-shaped reinforcement, dealt with in the old concrete interface roughness level, beam failure pattern analysis of the effect of roughness on the reinforcement of RC Beams. Shear capacity calculated using truss - arch model considering the roughness of the coefficients are derived with the test results? Certain reference value for the use of the actual project.

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CLC: > Industrial Technology > Building Science > Building structure > Concrete structure,reinforced concrete structure > Reinforced concrete structures > Girder
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