| Código SH | 152044 |
| Material | Álcool polivinílico (PVA) |
| Tipo De Fibra | Fibra de micro-reforço de monofilamento ultrafino |
| Gravidade Específica | 1.3 |
| Comprimento | Normalmente 4,8 mm (varia de acordo com as especificações) |
| Diâmetro | Ultra-fino (aproximadamente 14 mícrons) |
| Resistência à Tracção | 1.600 MPa (típico) |
| Módulo De Elasticidade | 40 GPa (típico) |
| Alongamento Na Ruptura | 6-7% |
| Ponto De Fusão | Aproximadamente 220°C (decompone-se antes de derreter) |
| Resistência A álcalis | Excelente em ambientes de concreto altamente alcalino |
Como fábrica acreditada da Fibra Nycon RMS702-PVA para reforço de concreto (ultra fina), aplicamos protocolos de qualidade rigorosos - cada lote é submetido a testes rigorosos para garantir padrões de eficácia e segurança consistentes.
| Embalagem | Fibras PVA ultrafinas Nycon RMS702-PVA embaladas em um saco solúvel em água de 1 lb para fácil manuseio e dosagem precisa. |
| Carga de contêiner (20' FCL) | Carregamento FCL de 20 ": Fibras ultrafinas Nycon RMS702-PVA embaladas em sacos selados em paletes, uniformemente empilhadas e protegidas para transporte seguro. |
| Envio | As fibras ultrafinas Nycon RMS702-PVA são transportadas como carga seca e não perigosa em sacos selados em paletes. Proteja-se da umidade e umidade durante o trânsito e armazenamento. Use contêineres padrão de van seca ou caminhões cobertos; nenhum endosso especial de materiais perigosos é necessário. Permita o tempo de entrega padrão do transporte terrestre, dependendo do destino. |
| Armazenamento | Armazene as fibras ultrafinas Nycon RMS702-PVA em uma área fria, seca e bem ventilada, de preferência em sua embalagem original fechada. Mantenha longe da luz solar direta, fontes de calor e chamas abertas. Proteja da umidade e umidade para evitar aglomerações ou degradação. Evite empilhar excessivamente ou esmagar sacos. Sob condições adequadas, a vida útil é normalmente de longo prazo e estável. |
| Prazo de validade | A vida útil das fibras ultrafinas Nycon RMS702-PVA é indefinida sob armazenamento a seco, fechada e protegida da luz solar direta. |
Em crete de mistura úmida colocado através de uma bomba de pistão duplo equipada com uma válvula S e um anel de ar de bocal de 50 mm, o monofilamento Nycon RMS702 PVA ultrafino é introduzido na planta de lotes imediatamente atrás do agregado grosseiro e antes da primeira descarga de água. A fibra é classificada sob EN 14889-2:2006 para fibras de polímero para concreto, e a mistura resultante é especificada para ASTM C1116/C1116M-23 fibra sintética tipo III. A dosagem é ajustada em 0,5-1,0% em volume, equivalente a 6,5-13,0 kg/m³ com uma densidade de fibra de 1,30 g/cm³. O limite inferior é usado onde o rebote do bocal deve permanecer abaixo de 15%; o limite superior é mantido para revestimentos permanentes em que a resistência à flexão residual medida de acordo com ASTM C1609/C1609M-19a deve exceder 1,5 MPa em L/600. A fibra é misturada num misturador obrigatório de dois eixos durante um mínimo de 180 s após a adição da fibra; a temperatura do lote é mantida abaixo de 29 °C para evitar o amolecimento do PVA, e a mistura é transportada sob agitação lenta por não mais de 60 min. A descarga em uma bomba de pistão equipada com uma válvula S de 65 mm e disparada através de um bico de 50 mm a 1,0–1,4 m³/h mantém a pressão do bico a 0,4–0,6 MPa. Acelerador livre de álcalis é injetado no bocal a 4-8% em peso de ligante somente após a dispersão da fibra ter sido confirmada lavando uma amostra 5 L através de uma peneira 1,18 mm e verificando as bolas de fibra. Os produtos terminais incluem revestimentos de túnel temporários e permanentes, revestimentos de eixo, conchas de estabilização de inclinação e revestimentos de arco de estação subterrânea. Experiência de campo em linhas de mistura úmida mostra que a bola de fibra aumenta bruscamente quando a fibra é adicionada a uma mistura com queda abaixo de 80 mm, de modo que a queda na tolva da bomba é mantida entre 100 mm e 140 mm. Os dados publicados para esta configuração específica Nycon RMS702 em granito agregado shotcrete são limitados; a calibração do local contra a absorção de energia do painel redondo sob ASTM C1550-20 é necessária antes das obras permanentes.
Fibra Nycon RMS702-PVA para reforço de concreto (ultra fina) preços competitivos 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.
Responderemos a você o mais rápido possível.
Telefone: +8615380400285
E-mail: sales2@liwei-chem.com
Pagamento flexível, preço competitivo, serviço premium - Consulte-nos agora!
Nycon RMS702-PVA Fiber for Concrete Reinforcement (ultra fine) is a polyvinyl alcohol micro-synthetic fiber specified for the control of early-age shrinkage cracking in concrete, mortar, and wet-mix shotcrete. The product is classified under ASTM C1116 as a synthetic fiber for concrete and falls within the scope of EN 14889-2 for polymer fibers used in concrete, mortar, and grout. Published property ranges for PVA concrete fibers include a density of approximately 1.30 g/cm³, tensile strength of 1,500–1,600 MPa when tested under ASTM C1557, Young’s modulus of 38–42 GPa, and elongation at break of 6–8%. The ultra-fine grade is characterized by a filament diameter below 0.04 mm and a cut length typically below 10 mm; these dimensions produce a higher fiber count per kilogram than conventional 0.1 mm polypropylene micro-fibers. For the RMS702-PVA designation specifically, the current mill certificate should be used to confirm the exact cut length and filament denier because published data for this specific configuration is limited.
The fiber is batched at 0.5–2.0 kg/m³ for plastic shrinkage crack control and at 4.0–8.0 kg/m³ in high-ductility composite mixes where multiple cracking is intended. In a compulsory twin-shaft mixer or planetary counter-current mixer, the material should be added after the aggregates and cement have been dry-mixed for 10–15 s, followed by water and admixtures. The addition rate should not exceed 50 kg/min through a vibratory screen or a closed hopper to prevent balling. Air content under ASTM C231 and slump under ASTM C143 should be re-checked after fiber addition; an air-entrained concrete may lose 0.5–1.0% air or gain air depending on the surfactant dosage and mixing energy, so the air-entraining agent must be re-optimized before production.
The primary fresh-state effect is a substantial increase in surface area and fiber count at low addition rates. A reduction in diameter from 0.1 mm to 0.026 mm raises the number of fibers per kilogram by approximately one order of magnitude. This change reduces bleeding and plastic settlement, and it also increases the yield stress of the mortar fraction. In a 0.50 water-to-cementitious ratio concrete containing 1.0 kg/m³ of the ultra-fine PVA fiber, slump measured under ASTM C143 is commonly 10–25 mm lower than the equivalent plain mix, while the plastic viscosity measured by a concrete rheometer may rise by 10–20%. When the water-to-cementitious ratio is below 0.40, the viscosity increase can be more pronounced, and field adjustments should use a high-range water reducer conforming to ASTM C494 Type F or EN 934-2 rather than additional mixing water.
The product functions best when the concrete is placed and finished promptly. Because ultra-fine PVA increases the green cohesion of the paste, bleed water may be delayed or reduced, and finishing operations may need to begin earlier than on plain concrete. The fiber is not a curing compound; without moist curing or a curing membrane meeting ASTM C309, the concrete can still develop plastic shrinkage cracks as the surface desiccates. In hot-weather placement where evaporation rate exceeds 0.5 kg/m²/h, the fiber should be combined with windbreaks, fogging, and condensation monitoring rather than specified as a standalone mitigation measure.
For wet-mix shotcrete, the ultra-fine PVA fiber is added at 1.0–3.0 kg/m³ to improve cohesion and reduce rebound in a pumping line. A typical wet-mix shotcrete train with a 50 mm delivery hose and outlet pressure of 0.3–0.5 MPa benefits from fiber distribution because the high fiber count limits aggregate segregation at the nozzle. Rebound mass measured from sprayed test panels in accordance with ACI 506R can be reduced by 10–30% relative to the same mixture without fiber, but this reduction is dependent on nozzle angle, nozzle distance, air flow, and aggregate grading. In low-slump repair overlays placed at 25–50 mm thickness, the fiber provides green tensile cohesion that reduces edge slumping and material loss on vertical surfaces.
The same addition should not be made by simply dumping the full bag into a ready-mix drum at high speed. After fiber introduction, 30–45 revolutions at mixing speed are commonly specified to distribute micro-synthetic fibers uniformly through a truck mixer. Because ultra-fine PVA is hydrophilic, it can form fiber aggregates in high-slump concrete with excess free water or when added too rapidly; in a stationary mixer, a controlled feed rate below 50 kg/min is recommended. In pumpable concrete, the fiber can change the lubricating layer near the pipe wall; line pressure testing with a pump screed or pressure transducer is recommended before establishing a pumping protocol for large placements.
The product is intended to control early-age cracking and is not a direct replacement for structural reinforcement. Plastic shrinkage testing under ASTM C1579-21 has been used to compare fiber-reinforced concretes; published studies on PVA micro-synthetic fibers at 0.9 kg/m³ show crack width and total crack area reductions of 60–80% relative to the same unreinforced mixture. The testing measures cracking on an overlaid slab under controlled air flow and evaporation. The crack reduction ratio is calculated from the sum of crack widths recorded at 24 h after placement. Because the RMS702-PVA ultra-fine fiber provides a high number of bridging filaments across each crack path, the early crack opening is constrained before final set rather than after the matrix has fully hardened.
Restrained ring testing under ASTM C1581 provides additional data for concrete at 0.9–1.8 kg/m³. Published data for PVA micro-synthetic fibers indicate delayed initial cracking and reduced average crack width in restrained concrete rings when compared to plain concrete. The test outcome is sensitive to curing and ring geometry, so direct comparisons require identical mix proportions and curing conditions. Performance is also reduced if the fiber is not uniformly dispersed; a concrete with fiber balls will behave as an unreinforced material at the local tensile zone.
The RMS702-PVA ultra-fine fiber differs from polypropylene micro-fibers in elastic modulus, surface bonding, and dimensional stability. PVA concrete fiber typically has a Young’s modulus of 38–42 GPa, whereas polypropylene micro-fibers are in the range of 3–6 GPa. Tensile strength values of 1,500–1,600 MPa for PVA also exceed the 300–450 MPa range common for polypropylene micro-fibers. The hydrophilic nature of PVA improves adhesion to cement paste and reduces fiber pull-out under ASTM C1557 fiber-cement pull-out testing. Unlike steel fibers, the PVA fiber does not corrode, does not increase electrical conductivity, and does not trowel to the surface as a protruding steel filament. However, it does not provide equivalent post-crack flexural capacity at the same dosage.
| Property | Ultra-fine PVA (RMS702-PVA) | Polypropylene micro-fiber | Hooked-end steel fiber |
|---|---|---|---|
| Density | 1,300 kg/m³ | 910 kg/m³ | 7,850 kg/m³ |
| Tensile strength | 1,500–1,600 MPa | 300–450 MPa | 1,000–1,200 MPa |
| Young’s modulus | 38–42 GPa | 3–6 GPa | 200 GPa |
| Elongation at break | 6–8% | 15–25% | 0.5–1.0% |
| Fiber count at 0.9 kg/m³ | High; order of magnitude above PP micro-fiber | Moderate | Low |
| Corrosion in reinforced concrete | None | None | May corrode near surface if cracked and exposed |
The comparison in residual flexural performance is commonly assessed under EN 14651 or ACI 544. Steel hooked-end fibers can maintain significant residual stress at crack mouth opening displacement above 0.5 mm, whereas PVA ultra-fine fiber at low dosage is generally specified for crack widths below 0.2 mm. When high-volume PVA fiber is used in engineered cementitious composites, multiple cracking and tensile strain capacity above 2% have been reported in published literature, but those formulations require optimized particle packing, viscosity-modifying admixtures, and high-range water reducers that differ from ordinary ready-mix production. Published data for this specific product configuration is limited at high dosage; therefore, full-scale trial panels and batch-specific testing are required before structural use.
In production, the fiber bags should be stored off the ground in a dry environment. Fiber moisture content should remain below 1.0% by mass before batching; if storage relative humidity exceeds 60% or condensation is observed, drying is required to prevent clogging of the fiber feed system and false air-entrainment readings. The fiber is compatible with Portland cement, fly ash, slag, and silica fume binders, but is not a mitigation for alkali-silica reaction; aggregate reactivity must be evaluated under ASTM C1260 or ASTM C1293 independently. Air-entrained mixes should be re-optimized after fiber addition because the high surface area can interact with air-void surfactants and change the bubble size distribution. Steam curing above 60°C requires a production trial, as published data for this specific configuration is limited and the fiber-cement interface may be altered by rapid temperature rise.
