Accelerated Corrosion Testing Apparatus for Cracked Concrete
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Solution Overview
Problem
There is a lack of methods and devices for accelerating the corrosion of reinforcing steel in reinforced concrete specimens with cracking, making it difficult to determine the deterioration state of reinforced concrete structures due to reinforcing steel corrosion.
Innovation Solution
An accelerated corrosion test method and apparatus that uses a moisture sensor and weight measuring instrument to control a moisture supply and removal device, alternately performing wetting and drying steps to accelerate corrosion by managing moisture levels within the cracked concrete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional corrosion testing methods are used on reinforced concrete specimens with cracking, then the test can be performed with simple equipment, but the corrosion process takes an extremely long time and cannot determine deterioration state in a practical period
Solution Approach 1:
The patent applies periodic action by alternately performing wetting and drying cycles on the cracked reinforced concrete specimen. The wetting step supplies moisture to accelerate corrosion, while the drying step removes excess moisture. This periodic alternation creates favorable conditions for rapid corrosion progression without requiring continuous moisture exposure, thereby achieving accelerated corrosion testing within a practical time frame.
Solution Approach 2:
The patent changes the moisture parameter dynamically through controlled wetting and drying steps. By adjusting moisture content periodically rather than maintaining constant humidity, the corrosion rate is significantly accelerated. The moisture sensor and weight measuring instrument monitor these parameter changes to ensure optimal corrosion conditions are maintained throughout the testing period.
2Productivity
If moisture is continuously supplied to accelerate corrosion, then corrosion rate increases, but oxygen supply becomes insufficient and corrosion cannot proceed effectively
Solution Approach 1:
The patent resolves this contradiction by implementing periodic wetting and drying cycles. During the wetting step, moisture is supplied to enable electrochemical corrosion reactions. During the drying step, moisture is removed allowing oxygen to penetrate and replenish supply. This periodic alternation ensures both moisture and oxygen are available at appropriate times, maintaining high corrosion rates without oxygen depletion.
3Ease of operation
If manual inspection methods are used to detect cracking, then the inspection process is simple, but the time interval between inspections allows cracking to progress undetected
Solution Approach 1:
The patent applies self-service by using the cracked reinforced concrete specimen itself to generate detection signals. The moisture sensor and weight measuring instrument automatically detect changes caused by cracking and corrosion progression without requiring external inspection intervention. This self-monitoring capability enables continuous detection, eliminating time delays associated with manual inspection intervals while maintaining operational simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively accelerates the corrosion of reinforcing steel in cracked reinforced concrete specimens, reducing the time required for the corrosion test and enabling earlier assessment of the deterioration state of reinforced concrete structures.
Implementation Method 1
a control terminal is connected both to a moisture sensor disposed near the reinforcing steel exposed from the cracked portion of the concrete
Implementation Method 2
to a weight measuring instrument that measures a weight of the reinforced concrete specimen
Implementation Method 3
a drying step of terminating the wetting step and removing moisture in the inside of the crack and moisture on the exposed surface of the reinforcing steel
Implementation Method 4
supplying moisture to the inside of a crack in the cracked concrete
Data Source
AI summary
An accelerated corrosion test apparatus includes: a moisture sensor disposed near the reinforcing steel exposed from a cracked portion of concrete; a weight measuring instrument that measures a weight of the reinforced concrete specimen; and a control terminal that is connected both to the moisture sensor and to the weight measuring instrument and controls a temperature and humidity control device, thereby alternately and repeatedly performing a wetting step of supplying moisture to the inside of a crack in the cracked concrete, and a drying step of removing moisture in the inside of the crack and moisture on the exposed surface of the reinforcing steel, wherein the control terminal terminates the wetting step and starts the drying step when moisture is detected in the moisture sensor, or when change in slope of weight change of the reinforced concrete specimen is detected, after the start of the wetting step.