Fiber material for cement reinforcement
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Solution Overview
Problem
Existing fiber materials for cement reinforcement face challenges in achieving high cohesion and reinforcing effects, particularly in high-viscosity concrete or mortar, due to issues with fiber dispersion, entanglement, and interfacial adhesion strength, which affect bending toughness and fluidity.
Innovation Solution
A fiber material with a resin A containing an isocyanate compound inside the fiber bundle and a resin B with an epoxy resin on the surface, using a combination of polyol or epoxy compounds, and specific fiber types like aramid and carbon fibers, to enhance cohesion and adhesion with cement mortar or concrete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If non-volatile oil is attached to fibers bundled with a resin to enhance cohesion, then fiber cohesion is improved, but interfacial attachment strength between cement mortar or concrete and fibers decreases
Solution Approach 1:
The patent applies different resin types to different locations within the fiber structure: hydrophobic resins (isocyanate, polyolefin) are used inside the fiber bundle for cohesion, while hydrophilic resins (carboxyl-group-containing acrylic-modified resin) are used on the outer surface for cement adhesion. This spatial differentiation of material properties resolves the contradiction between internal cohesion and external adhesion requirements.
Solution Approach 2:
The patent creates a composite resin system combining multiple resin types with different chemical properties. The fiber bundle contains both hydrophobic resins for internal binding and hydrophilic resins for external cement adhesion, forming a multi-layered composite structure that simultaneously achieves both cohesion and interfacial attachment strength.
2Strength
If carboxyl-group-containing acrylic-modified resin is used to bundle fibers, then interfacial adhesion with cement is improved, but cohesive strength of the resin layer on the adhesion interface decreases
Solution Approach 1:
The patent positions the carboxyl-group-containing acrylic-modified resin specifically on the outer surface of the fiber bundle where cement adhesion is needed, while placing hydrophobic resins (isocyanate or polyolefin) inside the bundle for cohesive strength. This localized placement ensures each resin type performs its optimal function without compromising the other property.
Solution Approach 2:
The patent combines carboxyl-group-containing acrylic-modified resin with hydrophobic resins in a composite structure. The hydrophilic resin provides cement adhesion at the interface, while the hydrophobic resin provides internal cohesive strength, creating a synergistic multi-resin system that overcomes the limitations of using a single resin type.
3Stability of the object's composition
If high-molecular-weight acrylic-modified resin with high cohesive strength is used, then cohesive strength is improved, but the resin is hard to penetrate the inside of the fiber bundle, resulting in poor fiber bundle cohesion
Solution Approach 1:
The patent changes the molecular weight parameter of the resin used inside the fiber bundle, selecting low-molecular-weight hydrophobic resins (isocyanate or polyolefin) that can easily penetrate and impregnate the fiber bundle interior. These low-viscosity resins achieve thorough saturation of the fiber structure, providing uniform cohesive strength throughout the bundle without the penetration difficulties associated with high-molecular-weight resins.
4Ease of operation
If monofilament-type fiber with large fiber diameter is used to enhance dispersibility, then fiber dispersibility is improved, but strength per fiber thickness decreases
Solution Approach 1:
The patent uses multifilament-type fibers composed of multiple thin filaments bundled together rather than single monofilaments. This segmented structure maintains the dispersibility advantages of thin fibers while achieving the required overall dimensions through bundling. The multiple thin filaments resist entanglement better than equivalent-diameter monofilaments, yet the bundled structure provides sufficient size for handling and reinforcement effectiveness.
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 solution provides a fiber material with high cohesion and excellent reinforcing effects, especially in high-viscosity concrete or mortar, improving bending toughness and maintaining fluidity during the production process.
Implementation Method 1
a resin A containing an isocyanate compound as a constituent component is present inside a fiber bundled body
Implementation Method 2
a resin B containing an epoxy resin as a constituent component is present on a surface of the fiber bundled body
Data Source
AI summary
Provided is a fiber material for cement reinforcement, configured such that a resin A containing an isocyanate compound as a constituent component is present inside a fiber bundled body, and a resin B containing an epoxy resin as a constituent component is present on a surface of the fiber bundled body. Further, it is preferable that the resin A contains a polyol or an epoxy compound as a constituent component in addition to the isocyanate compound, the resin B contains an acrylic-modified epoxy resin or a bisphenol-A epoxy resin as a main component, the fiber bundled body has a tensile strength of 7 cN/dtex or more, and the fiber bundled body includes 50 to 3,000 single fibers. The invention is also addressed to a concrete or mortar molded article using the above fiber material for reinforcement.