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Loading device for testing permeability of concrete chloride ions and test method

A technology of chloride ion penetration and loading device, which is applied in the field of loading device for concrete chloride ion permeability coulometric method, which can solve the problems of inability to realize the test piece, blank test method, applied load, etc., and achieve stable test results and simple structure , the effect of load stabilization

Inactive Publication Date: 2010-06-02
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the standard (ASTM C1202) adopted by many countries for evaluating the ability of concrete to resist chloride ion penetration formulated by the American Society for Standards and Testing of Materials is to apply a DC voltage of 60V at both ends of a Φ95×50mm concrete sample, and pass the test. The amount of electricity that flows within 6 hours is used to evaluate the permeability of concrete chloride ions. The devices and methods used do not consider and cannot realize the application of loads to the test pieces
Therefore, due to the restriction of the conventional concrete chloride ion permeability test device, the test method for the chloride ion permeability of concrete under complex compressive load conditions is still blank at this stage.

Method used

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  • Loading device for testing permeability of concrete chloride ions and test method
  • Loading device for testing permeability of concrete chloride ions and test method
  • Loading device for testing permeability of concrete chloride ions and test method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A loading device for testing the chloride ion permeability of concrete, which consists of two parts: a lateral loading system and a longitudinal loading system. The lateral load-bearing steel plate 1 in the lateral loading system is vertically arranged on the longitudinal load-bearing steel plate 14. "L" shaped positioning piece 15 is fixed;

[0035] The side end of the lateral loading system is a lateral load-bearing steel plate 1, four high-strength screw anchor holes are symmetrically arranged in the four corner regions of the lateral load-bearing steel plate 1, and four lateral high-strength force-transmitting screws 31 Anchored in four high-strength screw anchor holes; the bottom of the "L"-shaped test piece seat 2 is flush with the lower edge of the lateral load-bearing steel plate 1, and the vertical surface of the "L"-shaped test piece seat 2 is located on the side to the middle of the load-bearing steel plate 1; the four corner regions of the lateral load-bearing...

Embodiment 2

[0049] Fabrication and assembly steps of the loading device for testing the chloride ion permeability of concrete under complex compressive loading conditions:

[0050] The first step: Use steel plates with a length of 240mm, a width of 240mm, and a thickness of 20mm to make the lateral load-bearing steel plate 1, the lateral load steel plate 8 and the lateral fixed steel plate 11 in the lateral loading system; the four lateral load-bearing steel plates 1 One M25 bolt hole is processed in the corner area, one circular hole with a diameter of 26.5mm is processed at the corresponding positions of the lateral loading steel plate 8 and the lateral fixed steel plate 11, and the four lateral high-strength force transmission rods with a length of 600 mm and a diameter of 25 mm are processed. The screw rod 31 is reliably connected with the lateral bearing steel plate 1 .

[0051] Step 2: Make an "L"-shaped test piece seat 2, whose outer dimensions are 200mm high, 120mm long, and 100mm...

Embodiment 3

[0059] Test method for testing chloride ion permeability of concrete under complex compressive load conditions:

[0060] 1. Raw materials and test pieces

[0061] Use P·O 42.5 grade cement (see Table 1 for physical properties), river sand with a fineness modulus of 2.5, limestone artificial gravel with a maximum particle size of 20mm, and tap water to prepare concrete according to the mix ratio shown in Table 2, and form it into a 100mm ×100mm×100mm cubic concrete specimens, 24 specimens for each ratio. After the specimens were cured in the concrete standard curing room for 28 days, 3 specimens of each proportion were selected to measure the compressive strength as a reference for the loading size of the remaining specimens in the chloride ion permeability test. The compressive strength of each group of specimens is shown in Table 2.

[0062] Table 1 Basic physical properties of P·O 42.5 grade cement

[0063]

[0064] Table 2 Concrete mix ratio and compressive strength o...

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Abstract

The invention discloses a loading device for testing the permeability of concrete chloride ions, which comprises a longitudinal loading system and a lateral loading system, wherein the longitudinal loading system comprises a longitudinal bearing steel plate, an 'L'-shaped positioning piece, a lateral high-strength transmission screw, a longitudinal steel base plate, a longitudinal dynamometer, a longitudinal ball seat, a longitudinal loading steel plate, a longitudinal hydraulic jack, a longitudinal fixing steel plate and the like; and the lateral loading system comprises a lateral bearing steel plate, an 'L'-shaped test piece block, a longitudinal high-strength transmission screw, a lateral steel base plate, a lateral dynamometer, a lateral ball seat, a lateral loading steel plate, a lateral hydraulic jack, a lateral fixing steel plate and the like. The invention also relates to a test method for testing the permeability of the concrete chloride ions by utilizing the loading device. The loading device and the test method solve the problems that the conventional device for testing the permeability of the concrete chloride ions cannot load tested pieces, cannot simulate the actual load condition of the conventional concrete and cannot measure the permeability of the concrete chloride ions under the condition of pressure load.

Description

technical field [0001] The present invention relates to a loading device for testing the chloride ion permeability electric method of concrete, in particular to a loading device for performing the chloride ion permeability electric method test on concrete under complex compressive load conditions, and the present invention also relates to a loading device using the loading device testing method. Background technique [0002] Some durability problems of concrete, including water osmotic corrosion, alkali-aggregate reaction, freeze-thaw cycle damage, carbonation, chloride ion erosion and steel corrosion, are closely related to its permeability. Good impermeability is a necessary condition to ensure the safety and durability of many important concrete projects. The chloride ion permeability of concrete is not only an important index to characterize the permeability of concrete, but also an important indicator of the corrosion resistance of steel bars in reinforced concrete in ...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 顾冲时方永浩包腾飞郑东健苏怀智吴中如
Owner HOHAI UNIV
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