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Testing device and method for directly testing adhesive property between early-age concrete and reinforcing steel bars

A technology for testing device and bonding performance, applied in measuring devices, mechanical devices, instruments, etc., can solve the problems of inconvenient construction site measurement, inability to measure the bonding performance of concrete and steel bars, etc., to achieve simple assembly and eliminate eccentricity , the effect of less instrument

Inactive Publication Date: 2012-06-20
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The pull-out test needs to use the testing machine to load the poured test piece, which is not convenient for measurement at the construction site
Existing devices must remove the formwork of the specimen and fix it on the corresponding device for measurement, and the test device is prone to eccentricity, so it is impossible to measure the bonding performance of early concrete and steel bars

Method used

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  • Testing device and method for directly testing adhesive property between early-age concrete and reinforcing steel bars
  • Testing device and method for directly testing adhesive property between early-age concrete and reinforcing steel bars

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing, the present invention is described in detail:

[0017] Such as figure 1 As shown, the test device of the present invention directly measures the bonding performance of reinforced concrete at an early age, including an outer frame 5 and a loading device arranged in the outer frame 5, wherein the outer frame 5 is composed of a top I-shaped steel beam 1, two sides I-shaped The shaped steel columns (the right I-shaped steel column 2 and the left I-shaped steel column 3 ), and the bottom and top I-shaped steel beams 4 are connected by high-strength bolts 13 . A plane hinge 10 is placed on the upper end of the outer frame, and a hole is drilled in the center of the hinge. The plane hinge can ensure that the test piece has no force in the horizontal direction. The upper end of plane hinge 10 places the reinforced concrete specimen 19 that does not remove formwork, and the steel bar lower end is engraved with screw thread. Since...

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Abstract

The invention discloses a testing device and method for directly testing the adhesive property between early-age concrete and reinforcing steel bars. The testing device comprises an outer frame and a loading device arranged in the outer frame, wherein the upper end of the outer frame is connected with a test piece template for placing a test piece through a planar hinge, and the loading device comprises a hydraulic jack, a hollow load sensor, a ball hinge, a displacement sensor, a hydraulic oil pump and a resistance strain gauge. After the concrete is poured, a mould is not dismounted and is directly tested. Before testing, the displacement sensor is arranged at the top end of the test piece; during testing, the hydraulic oil pump drives the hydraulic jack to generate a pull force to the reinforced steel bars, so that relative slippage is formed among the reinforced concrete and the binding power is generated, and the adhesive property between the early-age concrete and the reinforcing steel bars is tested. The testing device, provided by the invention, has the advantages of simple structure, convenience for assembly and disassembly, and a small number of required materials and instruments, and is suitable for carrying out scientific research and testing the adhesive property between the early-age concrete and the reinforcing steel bars in a construction site.

Description

technical field [0001] The invention relates to a test device and a test method for measuring the bonding performance of early-age concrete and steel bars, belonging to the field of concrete construction. Background technique [0002] In the field of civil engineering, the bonding performance of reinforced concrete at an early age (mainly 28 days after concrete pouring) is very important. In the early age of concrete structure, the bonding performance of reinforced concrete develops rapidly, and its law has not been fully grasped. Accurate measurement of the early-age bonding performance of reinforced concrete is very important for evaluating the cracking performance of early-age concrete and avoiding cracks in early-age concrete structures. is of great significance. [0003] At present, the main methods for measuring the bond performance of reinforced concrete at an early age are pull-out test, beam test, and bond-slip test of long-buried reinforced concrete. The pull-out...

Claims

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Application Information

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IPC IPC(8): G01N19/04
Inventor 沈德建张今阳段小芳袁娇娇陆培娟
Owner HOHAI UNIV
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