Hydraulic ECC Material with Composite Fiber Mesh for Dam Corridors
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Solution Overview
Problem
Current ECC materials for dam foundation corridors lack sufficient compressive strength, bending strength, and anti-cracking and anti-seepage properties, particularly in structural joints connecting the corridor to the core wall and anti-seepage wall, leading to potential seepage issues and deformation.
Innovation Solution
A hydraulic ECC material is developed with a composite fiber mesh prepared by dipping fibers in water-borne epoxy resin, curing, and cutting into a mesh structure, combined with cement, fly ash, silica fume, fine aggregate, water reducer, and thickener, to enhance compressive strength, bending strength, and anti-seepage properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional ECC material is used in dam foundation corridors, then the material provides basic anti-cracking properties, but the compressive strength and bending strength are insufficient
Solution Approach 1:
The patent uses composite fiber mesh (combining steel fibers and synthetic fibers) embedded in ECC material to simultaneously improve compressive strength, bending strength, and anti-cracking properties. The composite reinforcement strategy allows the material to achieve high strength while maintaining reliability against cracking and seepage.
2Adaptability or versatility
If the corridor undergoes differential settlement under earth pressure load, then the corridor deforms to accommodate foundation unevenness, but the deformation damages water stops or causes penetrating fractures in concrete
Solution Approach 1:
The patent changes the material parameters of the corridor by using ECC material with composite fiber mesh reinforcement, which fundamentally alters the stress-strain relationship and deformation characteristics. This allows the corridor to undergo differential settlement and deformation while maintaining water stop integrity and preventing penetrating fractures, as the material can accommodate strain without failure.
3Adaptability or versatility
If the anti-seepage wall deforms downstream under earth pressure load, then the wall adapts to load conditions, but the deformation causes seepage to the corridor
Solution Approach 1:
The patent employs composite fiber mesh reinforcement in the ECC material to create a corridor that can adapt to wall deformation while maintaining anti-seepage performance. The composite fibers provide both tensile strength to accommodate deformation and continuity to prevent seepage paths.
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
The hydraulic ECC material significantly improves compressive strength, bending strength, anti-seepage properties, and interface adhesive bonding capacity, demonstrating high mechanical properties and micro-expansion effects, suitable for sections with anti-seepage and anti-cracking requirements in water conservancy projects.
Implementation Method 1
a composite fiber mesh prepared by dipping a composite fiber in a water-borne epoxy resin with a curing agent
Data Source
AI summary
A hydraulic engineered cementitious composite (ECC) material and an application thereof are provided. The ECC material includes 25-34 wt % of cement, 23-30 wt % of fly ash, 15-20 wt % of silica fume, 26-32 wt % a fine aggregate, 1.25-1.7% of a composite fiber mesh, 0.1-0.24 wt % of a water reducer, and 0.03-0.07 wt % of a thickener. The composite fiber mesh is prepared by dipping a composite fiber in a water-borne epoxy resin with a curing agent, performing uniform mixing, taking out and spreading the composite fiber, and then cutting or crushing the composite fiber into a small piece of mesh structure; and the composite fiber includes a PVA fiber and a carbon fiber, or a PVA fiber and a basalt fiber, at a weight ratio of (0.3-0.6):1.