In Situ Concrete Durability Testing via Pressure Drop
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Solution Overview
Problem
There is a need for a non-invasive, rapid method to assess the permeability and durability of concrete structures without causing destruction, as water is a destructive agent that significantly affects concrete longevity, and existing methods are time-consuming and invasive.
Innovation Solution
A system that applies high pressure to the concrete surface using a test liquid to simulate ocean water pressure, measuring pressure drop over time to assess the concrete's durability without coring or destructive actions, utilizing a pressure fitting, gasket, support structure, pressure source, plumbing, and data acquisition module to record pressure measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-destructive testing methods are used to assess concrete quality, then the concrete structure remains intact and undamaged, but the testing process becomes more complex and requires specialized equipment
Solution Approach 1:
The patent replaces traditional mechanical core extraction and physical destruction with a pressure-based testing system. A pressure fitting applies controlled hydraulic pressure to force water through the concrete surface, and pressure sensors measure pressure drop over time. This mechanical substitution allows quality assessment without physical removal of concrete cores, maintaining structure integrity while providing reliable permeability data.
Solution Approach 2:
The patent introduces water as an intermediary substance to assess concrete quality. By forcing water through the concrete under controlled pressure and measuring the pressure drop, the system indirectly evaluates concrete permeability and durability without directly damaging the concrete. The water acts as a probe that reveals concrete properties through its interaction with the material's pore structure.
2Measurement precision
If traditional core extraction methods are used to test concrete quality, then direct measurement of concrete properties is achieved, but the concrete structure is damaged and requires repair
Solution Approach 1:
The patent replaces the mechanical core extraction process with a non-invasive pressure testing method. Instead of physically removing concrete cores for laboratory analysis, the system applies pressure differential across the concrete surface and measures water penetration characteristics. This substitution maintains measurement precision for permeability assessment while eliminating the harmful effect of structural damage entirely.
Solution Approach 2:
The concrete structure itself serves as the test medium without requiring external sampling. The in-situ pressure testing method uses the concrete's own surface and internal structure to provide test data, eliminating the need to extract and transport concrete cores. The structure tests itself through the pressure drop measurement process, providing precise permeability data without external intervention that causes damage.
3Productivity
If rapid testing methods are implemented to reduce assessment time, then productivity increases, but measurement precision may be compromised
Solution Approach 1:
The patent applies preliminary action by pre-establishing the pressure fitting and sealing system directly on the concrete surface before testing begins. The gasket is positioned and sealed in advance, and the pressure source is pre-configured, allowing immediate initiation of the pressure test. This preliminary setup eliminates time-consuming preparation steps while maintaining measurement precision through proper sealing and calibrated pressure application from the start of the test.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining constant pressure application and continuous pressure drop measurement throughout the testing period. The pressure source operates continuously, and sensors record pressure changes in real-time without interruption. This continuous measurement approach provides accurate permeability data through the entire pressure decay process, capturing the full behavior of water penetration without gaps that could compromise precision.
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
Enables rapid, non-destructive assessment of concrete quality and durability, differentiating between high-quality and standard concrete based on moisture ingress resistance, effectively predicting long-term performance and reducing maintenance costs for infrastructure.
Implementation Method 1
applying a liquid at relatively high pressure to a surface of a concrete element
Implementation Method 2
measuring an amount of (or the pressure drop of) water or other liquid to ingress through the concrete surface under high pressure
Implementation Method 3
a pressure measurement device configured and adapted to measure the sustained and measurable pressure of the test liquid, creating a series of pressure measurements over time
Implementation Method 4
a round pipe flange with a pipe flange sealing surface configured and adapted to compress the gasket against the outer surface of the concrete test specimen around the test area
Data Source
AI summary
Systems and methods are provided to simulate, approximate, or replicate conditions similar to concrete elements being placed under pressures equivalent to several hundred feet of ocean water and to provide information useful to assess relative durability of concrete without coring or other destructive actions. The quality of concrete can be assessed by measuring the pressure drop of water or other liquid to ingress through the concrete surface under high pressure over time. A rapid assessment of quality of existing concrete is provided. Systems and methods can efficiently assess long term durability of existing concrete elements such as those used in midrise buildings, parking garages, bridge decks, and the like.