Double-Covered Concrete Rheometer for Time-Varying Parameter Detection
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Solution Overview
Problem
Current methods for measuring concrete rheological parameters are time-consuming, labor-intensive, and pose safety hazards due to the complexity and potential for inaccurate mixing ratios and water loss during the testing of time-varying properties.
Innovation Solution
A double-covered cylindrical container with a lifting frame that allows for 180° flipping, combined with a portable light-duty vane-type mixer, enables efficient detection of both initial and time-varying rheological parameters by maintaining a sealed environment and simplifying the remixing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to measure time-varying rheological parameters, then both initial and time-varying parameters can be measured, but the process is time-consuming and labor-intensive
Solution Approach 1:
The container is divided into two separate covers (first cover and second cover) that can be independently opened and closed. This segmentation allows the concrete mix to be sealed during storage and quickly accessed for measurement without requiring complete disassembly or transfer to another container, significantly reducing testing time while maintaining measurement precision.
Solution Approach 2:
The concrete mix is prepared and sealed in the container with both covers closed before the actual measurement begins. This preliminary action of pre-preparing and sealing the sample eliminates the time-consuming steps of transferring and re-preparing the mix at the measurement location, allowing immediate measurement when needed.
2Measurement precision
If conventional methods are used to measure time-varying rheological parameters, then both initial and time-varying parameters can be measured, but the operation is complicated and labor-intensive
Solution Approach 1:
The container structure is segmented with two independently operable covers, allowing simple opening and closing actions instead of complex transfer operations. The rheometer probe can access the sample through the opened cover without requiring disassembly of the entire container system.
Solution Approach 2:
The container system is designed to be self-sufficient, holding the concrete mix ready for measurement without requiring external mixing equipment or complex preparation steps at the measurement location. The sealed container maintains the sample's integrity and readiness for immediate testing.
3Measurement precision
If concrete is kept standing for a period of time before measurement, then time-varying rheological parameters can be determined, but water loss from evaporation occurs and mixing ratio accuracy deteriorates
Solution Approach 1:
The harmful factor of evaporation is extracted and eliminated by sealing the concrete mix between two covers. This creates a closed system that prevents water loss while still allowing the concrete to stand for the required time period, maintaining the original mixing ratio accuracy throughout the waiting period.
Solution Approach 2:
The sealed container creates a protected environment for the concrete mix during the waiting period, isolating it from external factors that could cause evaporation or contamination. This inert environment preserves the sample's composition until measurement begins.
4Measurement precision
If concrete is kept standing for a period of time and then remixed in a laboratory mixer, then time-varying rheological parameters can be measured, but safety hazards increase
Solution Approach 1:
The dangerous step of transferring concrete to a laboratory mixer is extracted and eliminated. Instead, the concrete remains in its original container which is designed for safe handling and measurement, removing the safety hazards associated with transferring and remixing standing concrete in laboratory equipment.
Solution Approach 2:
The container system provides all necessary functions (holding, sealing, and measurement) in one self-sufficient unit, eliminating the need to transfer concrete to external mixing equipment. This self-service capability removes the safety risks inherent in the transfer and remixing operations.
Data Source
AI summary
A time-varying detecting device and method for concrete rheological parameters, in which the double-covered cylinder has top and bottom covers (11, 12), both of which can be freely opened, is configured to contain a concrete sample, and a lifting frame includes a pair of vertical supports (21) extending in parallel with each other. The double-covered cylindrical container is held between the pair of vertical supports (21) by means of connecting members (30) in such a manner that it can be flipped 180° about a straight line along which the connecting members (30) extend under the action of an external force. To perform a test, the top cover (11) is opened and a concrete mix is filled in, followed by detecting initial rheological parameters. The top cover (11) is closed, and the concrete mix is left for a predetermined period of time. The double-covered cylindrical container is lifted to a predetermined height by raising the connecting members (30), flipped 180° and lowered back onto the floor. The bottom cover (12) is opened, and the concrete mix is re-mixed and homogenized, followed by finally detecting the time-varying rheological parameters of the concrete mix.