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What is Polyvinyl Alcohol Fiber?
Polyvinyl alcohol (PVA) fiber is mainly used in ultra-high-performance concrete and high-ductility concrete. Its main characteristics include high strength and high modulus, low elongation, wear resistance, acid and alkali resistance, and good weather resistance. It also exhibits good affinity and bonding with cement, gypsum, and other substrates. Furthermore, it is non-toxic, non-polluting, and does not harm human skin, making it one of the next generations of high-tech green building materials.
Currently, in the cement concrete engineering industry, due to the unique properties of PVA fiber, it has broad development prospects in engineering and construction applications, and is an ideal new product that can completely replace asbestos.
Key Features of PVA Fiber
High Strength And Low Elongation
Excellent mechanical properties, with extremely high tensile strength (>1200 MPa) and modulus (>35 GPa), making it an excellent secondary reinforcement material.
Acid and alkalinity
Low strength loss under prolonged acidic or alkaline environments.
Corrosion Resistance
The fibers do not mold, rot, or become infested with insects even after being buried underground for extended periods. It can operate stably in harsh environments for long periods.
Excellent Dispersibility And Adhesion
It has excellent affinity with cement and gypsum substrates, ensuring uniform distribution and forming a strong bond within the matrix.
Specification of Polyvinyl Alcohol Fiber
| Fiber diameter | 15µm ± 3 |
| Tensile strength | ≥1200MPa |
| Elastic modulus | ≥35GPa |
| Elongation at break | 6-11% |
| Hot water resistance | ≥98°C |
| Dry heat softening point | ≥216°C |
| Length | 6mm (can also be produced according to customer requirements) |
Functional Mechanism Of Polyvinyl Alcohol Fiber
1. Crack Resistance and Waterproofing: The randomly distributed fibers in the concrete (mortar) effectively prevent the occurrence and development of cracks, improving waterproofing and seepage resistance. Applications of PVA and PA (Nylon) fibers.
| Fiber Type | Fiber Dosage (g/m³) | Crack Reduction Rate % |
| PA (Nylon) Fiber | 90 | 46 |
| PVA Concrete/Mortar Fiber | 900 | 86 |
2. Impact and earthquake resistance: Effectively absorbs impact energy and improves earthquake resistance.
| Type | Fiber Properties | Cement Board Properties | Cement board formula: | ||||||
| Fineness (d) | Strength (kg/cm²) | Elongation (%) | Young's Modulus (kg/cm²) | Flexural strength (kg/cm²) | Toughness (area ratio) | Impact strength (kg/cm²) | Cracks (days) | ||
| PVA concrete/mortar special fiber | 2.4 | 15.2 | 6 | 3685 | 378 | 420 | 4.9 | 30 and above | Fiber 0.003: Cement 1: Silica sand 2 |
| 2.4 | 14.4 | 6.8 | 3127 | 356 | 38 | 4.3 | 30 and above | ||
| Asbestos | / | 240 | 1 | 2.3 | 1 | Asbestos (wet) 15: Slurry 3: Water 82 | |||
3. Improves the freeze-thaw resistance and fatigue resistance of concrete.
4. Increases toughness: Improves the brittleness of concrete and enhances its impact and bending resistance.
Application of Polyvinyl Alcohol Fiber
1. Large-volume concrete pouring and construction of railings, dams, parking lots, etc.
2. Fabrication of concrete components, slabs, lightweight wall panels, etc., as a substitute for asbestos, and production of asbestos cement products.
3. Shotcrete for tunnels, mines, culverts, etc.
4. Fabrication of lightweight wall panels, GRC panels, insulation boards, and other building materials.
How to use PVA Fiber
1. Keeping the original concrete mix proportions unchanged, accurately weigh the fibers according to the designed addition amount and the volume of concrete to be mixed each time.
2. After preparing the aggregates, add the fibers, then add the aggregates and fibers together to the mixer, add water, and mix.
3. After mixing, take a random sample. If the fibers are evenly dispersed into monofilaments, the concrete is ready for use. If there are still bundles of fibers, extend the mixing time by 30-60 seconds before use.
4. The construction and curing process for fiber-reinforced concrete is exactly the same as for ordinary concrete.
5. Product dosage: Generally, for plain mortar or cement paste, and fiber-reinforced cement flat sheets and corrugated sheets, the addition range is 0.6-1 kg/m², with a common dosage of 0.6 kg/m²; for concrete, the addition range is 0.6-1.9 kg/m², with a common dosage of 0.9 kg/m².
FAQ
Q: What makes polyvinyl alcohol (PVA) fiber different from other concrete reinforcement fibers?
A: Polyvinyl alcohol (PVA) fiber is renowned for its excellent bond strength to the cement matrix and superior crack resistance. Unlike polypropylene or steel fibers, PVA fibers can form chemical bonds with cement hydration products, significantly improving concrete density and durability.
Q: Can PVA fibers be used in all types of concrete?
A: Yes. PVA fibers are widely used in precast components, shotcrete, bridges, tunnels, and flooring, not only improving the tensile strength of concrete but also enhancing post-cracking ductility. They are suitable for both structural and non-structural concrete.
Q: What are the benefits of using PVA fiber in concrete reinforcement?
A: PVA fibers effectively prevent micro-crack formation, improve impact resistance, and extend structural life. Compared to steel fibers, they are non-corrosive, lightweight, and easily dispersed, making them a more advanced and economical reinforcement solution.
Q: How do polyvinyl alcohol fibers interact with alcohol in various applications?
A: PVA fibers generally exhibit good resistance to common alcohols such as ethanol and isopropanol. While polyvinyl alcohol is soluble in water, it is insoluble in organic solvents such as alcohol, acetone, and ether. Therefore, in alcohol-containing environments (such as surface cleaning or chemical treatment), PVA fibers typically maintain structural stability and good bonding properties.
However, prolonged exposure to high concentrations of alcohol or high temperatures may cause slight swelling or surface softening, but this generally does not affect their reinforcing effect in cement or composites.
Q: Can alcohol affect the strength or durability of polyvinyl alcohol fibers?
A: In general construction or industrial environments, alcohol does not significantly affect the strength and durability of PVA fibers. Their polymer chains remain stable to most mild solvents, and their mechanical properties do not decrease significantly. However, in special applications involving prolonged alcohol contact, compatibility testing is recommended to ensure stable performance.
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