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A method for improving corrosion resistance of coral concrete structures

A concrete structure and concrete technology, which is applied in the field of improving the corrosion resistance of coral concrete structures, can solve the problems of poor durability of coral concrete structures and corrosion of steel bars, and achieve the effects of reducing the risk of corrosion, short construction period and convenient construction

Active Publication Date: 2021-11-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: For the marine island and reef environment, the "defect" of the coral's natural porous structure and the seawater and coral contain a large amount of Cl - , can easily lead to corrosion of its internal steel bars, making the durability of the coral concrete structure poor

Method used

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  • A method for improving corrosion resistance of coral concrete structures
  • A method for improving corrosion resistance of coral concrete structures
  • A method for improving corrosion resistance of coral concrete structures

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for improving the corrosion resistance of coral concrete structures, comprising the following steps:

[0031] Step 1, preparation of modified epoxy asphalt coated steel bars: at room temperature, by brushing, the coating thickness is 40±2 μm;

[0032] Step 2, molding of reinforced coral concrete members and seawater exposure: forming ordinary reinforced coral concrete members and modified epoxy asphalt-coated reinforced coral concrete members according to the established mix ratio, removing the formwork and curing for 28 days, then performing seawater exposure for 0, 28, and 90 days and 180d;

[0033] Step 3, electrochemical test: at room temperature, use an electrochemical workstation to perform AC impedance spectroscopy testing, the scanning frequency is 10 mHz ~ 100 kHz, and the impedance test signal is a sine wave with an amplitude of 10 mV to obtain corals with different exposure times. Nyquist curves for steel bars in concrete.

Embodiment 2

[0035] A method for improving the corrosion resistance of coral concrete structures, comprising the following steps:

[0036] Step 1, preparation of modified epoxy asphalt coated steel bars: at room temperature, by brushing, the coating thickness is 40±2 μm;

[0037] Step 2, molding of reinforced coral concrete components and exposure to seawater: forming coral concrete components without adding, adding 3% calcium nitrite rust inhibitor and adding 2% amino alcohol rust inhibitor according to the established mix ratio, demoulding, After 28 days of curing, seawater exposure was carried out for 0, 28, 90 and 180 days;

[0038]Step 3, electrochemical test: at room temperature, use an electrochemical workstation to perform AC impedance spectroscopy testing, the scanning frequency is 10 mHz ~ 100 kHz, and the impedance test signal is a sine wave with an amplitude of 10 mV to obtain corals with different exposure times. Nyquist curves for steel bars in concrete.

Embodiment 3

[0040] A method for improving the corrosion resistance of coral concrete structures, comprising the following steps:

[0041] Step 1, preparation of modified epoxy asphalt coated steel bars: at room temperature, by brushing, the coating thickness is 40±2 μm;

[0042] Step 2: Reinforced coral concrete member forming and seawater exposure: Coral concrete members with a protective layer thickness of 1.5, 2.5, 3.5, 4.5, 5.5 and 7 cm were formed according to the predetermined mix ratio, and the seawater exposure was performed after demoulding and curing for 28 days. , 28, 90 and 180 d;

[0043] Step 3, electrochemical test: at room temperature, use an electrochemical workstation to perform AC impedance spectroscopy testing, the scanning frequency is 10 mHz ~ 100 kHz, and the impedance test signal is a sine wave with an amplitude of 10 mV to obtain corals with different exposure times. Nyquist curves for steel bars in concrete.

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Abstract

The invention discloses a method for improving the corrosion resistance of coral concrete structures, comprising the following steps: step 1, coating epoxy asphalt with anticorrosion performance on the outer surface of steel bars to prepare modified epoxy asphalt coated steel bars; step 2 , form reinforced coral concrete members with different types of steel bars, rust inhibitors, protective layer thicknesses, and concrete strength levels, and then remove the formed members from the formwork, and then expose them to seawater after curing; step 3, conduct electrochemical tests on reinforced coral concrete members , to obtain AC impedance spectra of steel bars in reinforced coral concrete members with different exposure times, and to evaluate the anti-corrosion performance of reinforced coral concrete members under different anti-corrosion measures. The invention provides an anticorrosion method using modified epoxy asphalt coated steel bars in a coral concrete structure, the thickness of the concrete protective layer is at least 5.5 cm, the concrete strength level is C50 and above, and an amino alcohol rust inhibitor is added. Significantly improve the corrosion resistance of coral concrete structures.

Description

technical field [0001] The invention belongs to the technical field of concrete durability, and in particular relates to a method for improving the corrosion resistance of coral concrete structures. Background technique [0002] Oceanic islands and reefs are far away from the mainland, with inconvenient transportation, and lack of natural sand, gravel and fresh water resources. Shipping from the mainland not only pushes up the project cost, but also makes it difficult to guarantee the construction period due to restrictions such as wind and waves. However, the coral and seawater resources on the reefs are abundant. Coral is porous and light, CaCO 3 The content is as high as 96%, which belongs to natural light aggregate. Therefore, in order to reduce the cost and ensure the construction period, it is important to use local materials such as coral, coral sand, cement, seawater, etc. engineering value. [0003] However, Cl in coral concrete - Diffusion has the "three highs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 达波余红发麻海燕吴彰钰马好霞巩位郭建博
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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