Method of testing permeability of concrete on surface of reinforced bar
A test method and technology for concrete, applied in the direction of analyzing materials, instruments, etc., can solve the problems of inaccurate evaluation of concrete permeability, different permeability of the surface layer, and the infiltration medium cannot fully reach the surface of the steel bar.
Inactive Publication Date: 2012-02-08
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
[0007] The common point of the above test methods on concrete permeability is to apply a penetrating medium on the outer surface of the concrete and infiltrate from the outside to the inside. There are some problems in this technical method: (1) Since the concrete will be subjected to carbonization and other effects during the service process, As a result, the permeability of the surface layer is completely different from that before carbonization, so that the evaluation of the permeability of concrete with a deep carbonation layer is not accurate enough; (2) The penetration medium applied by the conventional concrete permeability test method cannot fully reach the surface of the steel bar, so the tested The permeability cannot represent the result of reinforced surface concrete; (3) When it is applied to underwater engineering or concrete permeability test in special parts without enough space, because the external penetrating medium cannot be applied to the concrete surface in the underwater or tidal zone, etc., resulting in Conventional concrete permeability test methods cannot be applied in this field
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[0022] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings, but the implementation and protection scope of the present invention are not limited thereto.
[0023] Formed according to the mix ratio in Table 1?? 100×150mm concrete specimen (such as figure 1 ), a light source steel bar of 12×200mm was buried at the center of the concrete circle, and it was taken out for permeability testing after 90 days of curing under standard conditions. The internal steel bar is used as the cathode 1, and the external titanium mesh is used as the anode 4, and the specimen is placed in saturated Ca(OH) 2 In the electrolytic solution, a Φ5mm small hole 2 is drilled on the surface of the concrete to the surface of the steel bar, and a rubber hose 6 is used to connect the pressure gauge. In this embodiment, the pressure gauge is composed of a gas receiving bottle 3 and a U-shaped tube, and one end of the rubber hose 6 ...
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Abstract
The invention discloses a method of testing the permeability of the concrete on the surface of a reinforced bar. The method is that a certain amount of hydrogen near the reinforced bar or on the surface of the reinforced bar is released to the outside of the concrete and the pressure decline curve of the hydrogen is used to reflect the permeability of the concrete on the surface of the reinforcedbar in a set time. The invention utilizes the pressure decline curve of the hydrogen which is released to the outside of the concrete at the reinforced bar to evaluate the permeability of the concrete on the surface of the reinforced bar, thus the problems of the existing concrete permeability test method that the permeable medium which is added from the outside can not completely reach the surface of the reinforced bar and can not be added to the surface of the concrete in the water or tidal zone and the permeability of the concrete on the surface of the reinforced bar can be accurately evaluated. The invention can be widely used in the permeability tests of the concrete on the surface of the reinforced bars of concrete structures in the fields such as industrial or civil building, waterconservancy, electric power, railway and traffic.
Description
technical field [0001] The invention relates to the technical field of performance detection of reinforced surface concrete in building structures, in particular to a method for testing the permeability of reinforced surface concrete. Background technique [0002] As the world's largest man-made material, concrete is used in large quantities around the world. The mixing water of concrete supplies cement hydration, but the water required for complete hydration of cement does not exceed 20% of the cement mass, and the remaining water forms pores in hardened concrete, including capillary pores and gel pores. Capillary pores are channels for medium migration. The migrating medium may contain aggressive compounds, and may also dissolve some cement hydrates. It can freeze-thaw damage to concrete at subzero temperatures. Therefore, it can be said that the migrating medium in concrete is the carrier of many destructive factors for concrete. It can be seen that the permeability of ...
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IPC IPC(8): G01N7/10
Inventor 韦江雄杨墨余其俊
Owner SOUTH CHINA UNIV OF TECH