| Código SH | 268252 |
| Material | Monofilamento de álcool polivinil (PVA) |
| Geometria Da Fibra | Microfibra reta cilíndrica |
| Comprimento Da Fibra | 4 milímetros |
| Diâmetro Da Fibra | 0,04 mm (40 µm) |
| Proporção De Aspecto | 100 (comprimento/diâmetro) |
| Densidade Gravidade Específica | 1,30 g /cm³ |
| Resistência à Tracção | ≥1.600 MPa (N/mm²) |
| Módulo Elástico Young | ≥ 40 GPa (kN /mm²) |
| Alongamento Na Ruptura | ≤ 7% |
| Ponto De Fusão | 230 ° C |
| Resistência A álcalis | Excelente; estável em ambientes cimentosos alcalinos |
| Propriedade Da Dispersão | Dispersa-se uniformemente como filamentos separados quando misturado em concreto |
| Características Da Superfície | Hidrófila, proporcionando boa ligação à matriz cimentosa |
| Cor | Amarelo claro /creme |
Como fábrica acreditada da Fibra Kuraray RF400-PVA para reforço de concreto, aplicamos protocolos de qualidade rigorosos - cada lote é submetido a testes rigorosos para garantir padrões de eficácia e segurança consistentes.
| Embalagem | Embalado em embalagens de 20 kg contendo vinte sacos solúveis em água de 1 kg para uma dosagem segura, fácil e precisa. Quantidade: 20 kg. |
| Carga de contêiner (20' FCL) | Recipiente FCL de 20 'carregado com fibra Kuraray RF400-PVA paletizada e segura, evitando danos por umidade e garantindo um transporte seguro. |
| Envio | A fibra Kuraray RF400-PVA é enviada como sacos secos e paletizados em recipientes padrão. Certifique-se de que a embalagem permaneça selada para evitar absorção de umidade e contaminação. Armazene longe da luz solar direta e manuseie com equipamento industrial padrão. Nenhuma restrição especial de materiais perigosos se aplica, embora proteja as cargas para evitar danos ao saco durante o trânsito. |
| Armazenamento | Armazene a fibra Kuraray RF400-PVA em uma área fria, seca e bem ventilada. Mantenha-o em sua embalagem original fechada ou em recipientes seláveis para evitar a absorção de umidade. Evite luz solar direta, alta umidade e contato com a água. Mantenha o empilhamento organizado para evitar danos e mantenha-o longe de fontes de ignição e produtos químicos incompatíveis. |
| Prazo de validade | Armazene seco e protegido da luz solar; a vida útil é essencialmente indefinida, com o desempenho da fibra permanecendo estável ao longo do tempo. |
A fibra Kuraray RF400-PVA é incorporada em 1,5–2,0 vol% em compostos cimentinos de endurecimento por deformação onde múltiplas micro-fissuras e ductilidade de tração são necessárias para vigas de acoplamento sísmico, lajes de ligação de ponte e jaquetas de retrofit estruturais. A matriz é formulada com cimento Portland ordinário Tipo I/II, cinzas volantes Classe F a 1,0-1,4 kg/kg de cimento, fumo de sílice densificado a 0,05-0,10 kg/kg de cimento, e uma mistura de redução de água de alta gama calibrada para compensar a perda de processabilidade gerada pela superfície hidrofílica da fibra; a relação água-ligante é mantida entre 0,24 e 0,28 para manter a densidade de embalagem e a tenacidade da matriz. Em misturadores planetários de contracorrente de alto cisalhamento em escala de produção com uma panela rotativa e um rotor de estrela, o RF400-PVA é medido na pasta móvel em uma janela de 40-60 s após a obtenção de uma lama visualmente homogênea. Os modos de falha em escala de planta observados quando a carga de fibra é liberada abaixo de 30 s incluem pontes de fibra nas pontas do rotor e feixes densos incorporados na mistura, que mais tarde aparecem como aglomerados de superfície nas bordas do cofre. Liberação atrasada além de 90 s aumenta o binário de mistura e pode atrair ar adicional em lotes de alto volume de pasta, produzindo uma queda mensurável na resistência residual à flexão. A conformidade para aplicações de macrofibras sintéticas estruturais é verificada de acordo com a Cláusula EN 14889-2:2006 Classe II e ASTM C1116/C1116M-23 Betão reforçado com fibras sintéticas Tipo III; o desempenho flexural é avaliado de acordo com ASTM C1609/C1609M-24 com uma deflexão líquida de L/150, e a largura da micro-fenda é avaliada após teste de sorptividade aquática de acordo com ASTM C1585-20. Os componentes a jusante do terminal incluem vigas de acoplamento dominantes em cisalhamento em núcleos de concreto de alta altura, lajes de ligação instaladas entre vigas de ponte para substituir juntas de expansão e jaquetas de retrofit aplicadas a colunas de concreto armado não dúctil. Conjuntos de dados PVA-ECC independentes publicados para fibras 2,0 vol% geralmente documentam capacidade de deformação à tração de 3-5% e larguras de rachaduras residuais abaixo de 60 µm; Os ensaios de produção específicos do RF400 devem ser usados para confirmar os efeitos locais de interação agregado-cimento.
Preços competitivos Fibra Kuraray RF400-PVA para reforço de concreto que se ajustam ao seu orçamento - termos flexíveis e orçamentos personalizados para cada encomenda.
Para amostras, preços ou mais informações, entre em contato conosco em +8615380400285 Ou envie para sales2@liwei-chem.com.
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Kuraray RF400-PVA fiber for concrete reinforcement is a polyvinyl alcohol monofilament supplied as discrete cut strands for dispersion in hydraulic-cement matrices. The RF400 designation corresponds to a 400 denier filament cross-section; for circular geometry this yields a nominal filament diameter of approximately 0.20 mm. The polymer specific gravity is approximately 1.30. Supplier-published room-temperature tensile values place tensile strength between 1400 MPa and 1600 MPa, initial modulus near 40 GPa, and elongation at break between 6% and 7%. These are fibre values measured before concrete mixing, not extracted from cured specimens. The fibre is alkali-resistant in saturated calcium hydroxide solution at pH 12.5–13.0 and does not rely on metallic passivation for durability. Surface hydroxyl groups on the PVA backbone provide hydrogen-bonding potential with cement hydrates; this differentiates it from untreated polyolefin surfaces that depend primarily on mechanical anchorage. Typical concrete cut length is 30 mm; other cut lengths may be permissible for shotcrete or thin repair mortars, but published data for those RF400-specific configurations is limited.
| Property | Kuraray RF400-PVA | Steel macrofibre | Polypropylene macrofibre | Test method |
|---|---|---|---|---|
| Specific gravity | 1.30 | 7.85 | 0.90–0.92 | ASTM D792-20 |
| Tensile strength | 1400–1600 MPa | 1000–1300 MPa | 400–650 MPa | ASTM D2256-22 /ASTM A820/A820M |
| Elastic modulus | 40 GPa | 210 GPa | 3–10 GPa | supplier tensile data |
| Elongation at break | 6–7% | 2–4% | 15–25% | ASTM D2256-22 /ASTM A820/A820M |
| Nominal length for concrete | 30 mm | 25–60 mm | 30–50 mm | supplier specification |
| Corrosion in chloride-bearing concrete | not susceptible | surface oxidation possible | not susceptible | material difference |
Polypropylene macrofibres typically exhibit a specific gravity of 0.90–0.92, tensile strength of 400–650 MPa, and elastic modulus of 3–10 GPa. RF400-PVA has a specific gravity of 1.30, tensile strength of 1400–1600 MPa, and elastic modulus of 40 GPa. The higher modulus changes post-crack load response: for the same dosage and fibre length, the crack-bridging stress mobilizes at smaller crack-opening displacements. Under flexural testing according to ASTM C1609/C1609M, this typically appears as higher residual loads at net deflections of 0.5 mm and 2.0 mm, provided the matrix does not exhibit shear failure. Compared with steel macrofibres with a modulus of 210 GPa and specific gravity of 7.85, RF400-PVA is non-corroding and lighter, but its lower modulus means that equivalent structural post-crack capacity should not be assumed; residual flexural performance must be verified under EN 14651 or ASTM C1609/C1609M using the specific concrete mixture. PVA also develops a higher chemical-bind component with cement paste than polypropylene, while steel relies on mechanical end hooks and frictional anchorage.
Compared with alkali-resistant glass fibre, PVA does not require a zirconia-rich alkali-resistant coating because its resistance derives from the backbone chemistry. The tensile modulus of 40 GPa is below E-glass at 72 GPa and steel at 210 GPa, but well above polyethylene at 0.8–2.0 GPa and polypropylene at 3–10 GPa. This places RF400-PVA in an intermediate niche where crack-width control is achieved without metallic corrosion and without the abrasive wear of steel fibres on mixer liners. The dimensional stability and lower elongation at break compared with polyolefin macrofibres also reduce the strain required to activate crack bridging, which is relevant when crack widths must remain below 0.3 mm in watertight structures.
For strain-hardening cementitious composite applications, RF400-PVA is dosed at 2.0 vol% in a fine-grained mortar with maximum aggregate particle size below 250 µm, water-to-cementitious ratio of 0.25–0.30, and a polycarboxylate ether high-range water-reducing admixture. The matrix fracture toughness is kept low by removing coarse aggregate; published ECC studies using PVA fibres report ultimate tensile strains in the range of 3–5% under direct uniaxial tension. Strain-hardening response does not follow from fibre content alone. It requires interfacial bond to transition from debonding to slip-hardening under increasing crack opening. If the fibre surface sizing is too strong, fibre rupture dominates; if too weak, pullout occurs before multiple cracking. RF400-specific single-fibre pullout data in the public literature is limited, so trial mixtures should be qualified using direct uniaxial tensile tests. For normal crack-control service in slab overlays, a dosage of 0.5 vol% yields approximately 5.3 fibres/cm³ based on 30 mm length and 0.20 mm diameter. Plastic shrinkage crack-width control can be assessed under ASTM C1579-21. In dry-mix or wet-mix shotcrete, addition rates of 0.3–1.0 vol% are used to reduce plastic settlement cracking; published rebound data for RF400 specifically is limited and should be obtained from site-specific nozzle trials using ASTM C1550 panels.
At 0.5 vol%, the calculated fibre count is 5.3 fibres/cm³, and the calculated lateral surface area is approximately 100 m²/m³. At 2.0 vol%, these values rise to 21.2 fibres/cm³ and 400 m²/m³. This surface area consumes paste and polycarboxylate ether, so high-volume dosage requires a matrix with sufficient paste fraction. Batch-to-batch variance in sand surface area can shift the water demand by 1–3 kg/m³ at a fixed fibre content. Plant batching records should include sand moisture correction before fibre addition and should measure slump retention at 5 minutes, 15 minutes, and 30 minutes after mixing.
Fibre balling is the primary production failure when the product is introduced before coarse aggregate or when the entire bag is discharged in less than 10 seconds into low-slump concrete. In a 1.5 m³ twin-shaft compulsory mixer operating at 18 rpm, clumps of undispersed fibres can persist for 90 seconds or more when the sequence is incorrect. The preferred sequence is to add coarse aggregate and half the batch water, meter the fibre at 20–30 kg/min, then add cement, fine aggregate, and the remaining water. After batch discharge, a washed sample through a 4.75 mm sieve should show no retained fibre agglomerates. Because RF400 has a specific gravity of 1.30, it remains in suspension more readily than steel fibres, but vertical segregation can occur if slump exceeds 200 mm or if external vibration is prolonged. This staged addition approach is consistent with the batching guidance in ACI 544.3R-08.
Pumpability is governed by the ratio of pipe diameter to fibre length. For 30 mm fibres, the minimum recommended line diameter is 90 mm. Hose reducers from 90 mm to 75 mm can accumulate fibre at the transition if the concrete is stiff; pressure monitoring at the pump inlet should be compared with baseline mixtures without fibre. Published field pressure data for RF400 is limited, so full-scale pump trials are recommended before large placements.
Compliance under EN 14889-2:2006 requires the fibre manufacturer to declare physical and mechanical characteristics, including tensile strength, initial modulus, elongation at break, and geometric dimensions, and to state the effect on concrete performance through the applicable system of attestation. The user should verify that the RF400 product is covered by a valid Declaration of Performance for the intended concrete application. Under ASTM C1116/C1116M, RF400-PVA is classified as a synthetic fiber-reinforced concrete constituent; flexural performance for comparative design is determined using ASTM C1609/C1609M or EN 14651. Storage above 60% RH should be avoided unless moisture content is measured and batch water adjusted, because PVA fibres can adsorb water and alter open-bag fibre weight. The fibre is not a direct replacement for primary steel reinforcement in structural members; any use for structural residual-strength applications must be supported by design calculations based on measured post-crack flexural parameters.
RF400-PVA increases paste demand because of the high surface-area-to-volume ratio of the filament. At a dosage of 0.5 vol%, batch records from central mix operations indicate an additional water demand of approximately 2–5 kg/m³ depending on aggregate angularity, sand fineness, and high-range water-reducing admixture efficiency. In air-entrained concrete, air content should be measured after fibre addition because the fibre network can alter bubble retention during mixing and transportation; published air-loss curves for RF400-specific mixtures are limited. For structural design, the residual load values from ASTM C1609/C1609M should be determined for the same fibre dosage and source, because post-crack performance is sensitive to fibre length, diameter, and matrix fracture toughness. The fibre aspect ratio of 150 for 30 mm/0.20 mm dimensions is high enough to provide crack-bridging efficiency but can reduce workability at dosages above 1.0 vol%; slump retention and fibre distribution should be checked with full-scale mixer trials before acceptance. Full-scale trials should include washout inspection, air-content verification, and flexural toughness samples from the same batch before production release.
Where fire resistance governs, RF400 should not be used as the primary tensile reinforcement because PVA softens at elevated temperature. The melting point of PVA is near 220°C; exposure above 150°C can reduce residual bridging efficiency. Published post-heat flexural data for RF400 specifically is limited, so fire-rated structures should be tested or rely on steel reinforcement for post-fire integrity.
