Device for testing durability of FRP force transmission rod and test method
A test method and technology of dowel bars, which are applied in the field of devices for testing the durability of FRP dowel bars, can solve the problem that FRP is not conductive, FRP dowel bars are not applicable, and the test of FRP dowel bar durability lacks a systematic and complete test Methods and other issues to achieve the effect of strong corrosion resistance
Pending Publication Date: 2018-07-24
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
[0003] However, the performance and corrosion mechanism of traditional steel dowel bars and FRP dowel bars are quite different. Traditional dowel durability test methods are not suitable for FRP dowel bars. A perfect FRP dowel bar has not yet been formed in China. Rod durability test method, there is a lack of systematic and complete test methods for testing the durability of FRP dowel bars, and due to the characteristics of FRP non-conductivity, it is urgent to develop a durability test method for testing FRP dowel bars. Performance testing to support the wider application of FRP dowels
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Embodiment 1
[0056] Test the durability of FRP dowel bar, including the following steps:
[0057] A. Shear resistance test
[0058] (1) Select 9 standard FRP dowel bars, with a length of 450mm and a diameter of 32mm, numbered 1-9;
[0059] (2) Use an electronic scale to weigh the quality of each FRP dowel bar;
[0060] (3) Select 6 sets of experimental devices for testing the durability of FRP dowel bars, of which the length of the PVC pipe sleeves of the 6 sets of devices is 250mm, and the PVC pipe sleeves of the 4 sets of devices are numbered 1-6;
[0061] Insert No. 1-6 FRP dowel rods directly into the corresponding numbered PVC pipe sleeves; then lock one end of the PVC pipe sleeves of each device with a hydraulic lock, seal them with a silicone sealing strip, and fill each sleeve with The mass percentage is 0.16% Ca(OH) 2 , 1% NaOH and 1.4% KOH aqueous solution as the corrosion solution, so that the FRP dowel rod is immersed in the corrosion solution, and finally the other end of t...
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The invention discloses a device for testing the durability of an FRP force transmission rod and a test method. The device includes a PVC pipe sleeve, a hydraulic lock, and a silica gel sealing strip.According to the test method of the invention, an FRP force transmission rod is inserted into the PVC pipe sleeve of the device; the PVC pipe sleeve is filled with a corrosion solution, so that a corrosive environment can be simulated; constant-temperature maintenance is carried out; the changes of the mass, interlayer shear strength, bending strength and bending elastic modulus of the FRP forcetransmission rod before and after the maintenance are measured; and the durability of the FRP force transmission rod is judged. According to the device and the test method of the invention, the destruction process of the FRP force transmission rod is observed from a micro perspective, and the exploration of the corrosion mechanism of the FRP force transmission rod can be benefitted, the long-termcorrosion state of the FRP force transmission rod under an actual working condition can be comprehensively evaluated, and a scientific test method is provided for reducing the corrosion of the FRP force transmission rod and improving the long-term use performance of a cement concrete pavement.
Description
technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a device and a test method for testing the durability of an FRP dowel bar. technical background [0002] At present, the dowel bars used on cement concrete pavements in my country are generally steel dowel bars, but a large number of road practice data show that there are certain defects in steel dowel bars. After many years of use, the steel dowel bar is easily corroded due to the intrusion of rainwater, chloride, etc., causing the section of the dowel bar to expand and be in a locked state. Due to temperature or moisture changes, the concrete will expand or shrink. At this time, it is locked. A dowel bar will cause a large stress concentration. At the same time, due to the high surface hardness of the steel, it will also cause stress concentration at the contact interface between the dowel bar and the concrete under the action of the wheel load. The combined action...
Claims
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IPC IPC(8): G01M13/00G01N3/02G01N3/20G01N3/24G01N17/00
CPCG01M13/00G01N3/02G01N3/20G01N3/24G01N17/00
Inventor 胡迟春戴亮胡昊王雨梁国立苏俊光荣光宇王博宇赵建营
Owner SOUTH CHINA UNIV OF TECH