| HS Code | 152625 |
| Fiber Type | High Strength High Modulus Polyvinyl Alcohol (PVA) Fiber |
| Product Model | Sinopec-SVW Q-11 |
| Primary Use | Concrete reinforcement |
| Material | Polyvinyl Alcohol (PVA) |
| Physical Form | Short-cut monofilament fiber |
| Color | White to light yellow |
| Length | 3 mm to 20 mm (cut lengths available) |
| Diameter | 12 to 15 micrometers |
| Density | 1.29 to 1.31 g/cm³ |
| Tensile Strength | 1600 MPa or higher |
| Elastic Modulus | 40 GPa or higher |
| Elongation At Break | 6 to 8 percent |
| Melting Point | About 230 degrees Celsius |
| Alkali Resistance | High resistance to alkaline environments |
| Moisture Absorption | Less than 5 percent |
As an accredited Sinopec-SVW Q-11-High Strength High Modulus PVA Fiber（HSHM PVA Fiber） for Concrete factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 20 kg woven polypropylene bags with inner liner, palletized and shrink-wrapped for safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL loading of Sinopec-SVW Q-11 HSHM PVA Fiber: palletized, woven-bag packed, secured inside container for safe, efficient concrete-fiber transport. |
| Shipping | Sinopec-SVW Q-11 HSHM PVA Fiber ships in sealed, moisture-proof bags on pallets, protected from humidity and direct sunlight. Standard dry-container transport is suitable worldwide. Avoid sharp objects during loading. Keep away from ignition sources and store in a cool, ventilated area. Handle with care to preserve fiber integrity. |
| Storage | Store in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep in original sealed packaging to prevent moisture absorption and contamination. Avoid prolonged exposure to high humidity. Maintain stable temperature; no special hazardous storage requirements. Handle with care to preserve fiber integrity. |
| Shelf Life | Shelf life is typically 2 years when stored in dry, ventilated conditions away from moisture and direct sunlight. |
In ductile concrete members where post-crack residual flexural performance is used for seismic energy dissipation and shear redistribution, Sinopec-SVW Q-11 high strength high modulus PVA fibre is introduced at 0.5–1.2 vol%, calculated on total concrete volume. The fibre is dry-charged into a twin-shaft compulsory mixer after the coarse aggregate has been pre-wetted with 60–70% of the mixing water and before the remaining water and cementitious slurry are added; this sequence reduces fibre balling. Batch discharge occurs after 90–150 s of high-shear wet mixing, and the resulting slump is held between 100–150 mm by adjustment of a polycarboxylate-based high-range water reducer rather than by water addition. At dosages above 1.0 vol%, Q-11 may increase entrapped air by 1–3 percentage points; a defoaming admixture is required when air content exceeds 3.0% as measured by ASTM C231/C231M-22. Flexural qualification is performed on 150×150×500 mm beams under ASTM C1609/C1609M-19a, with first-peak and residual loads at net deflections of L/600 and L/150. In seismic coupling beams and beam-column joints, the specified residual strength at L/150 commonly ranges from 1.5–3.0 MPa, depending on cement content and aggregate interlock. ACI 544.4R-18 recognises the contribution of fibres to shear resistance, but Q-11 is not a substitute for primary longitudinal or transverse reinforcement. Published data for Q-11 specific to full-scale seismic frame subassemblages is limited; experimental verification of hinge region behaviour is required before use in ductility class high elements governed by ACI 318-19 or EN 1998-1. The terminal components include site-cast frame beams, foundation tie beams, shear walls, and coupling beams in hospitals and emergency response buildings where residual strength is part of the acceptance criteria.
Wet-mix sprayed concrete for New Austrian Tunnelling Method support and rock slope stabilisation is batched with Q-11 at 0.4–1.1 vol%. The fibre type selected for this work is commonly 12 mm, because shorter fibres reduce nozzle clogging but longer fibres improve post-crack flexural toughness after application. The concrete is conveyed through a rotor/stator wet-sprayed concrete pump with a 50 mm delivery hose and a 40 mm nozzle orifice; bends in the line are limited to 90° or less. At fibre contents above 1.0 vol%, pumping pressure can increase to 30–50 bar, which requires a polycarboxylate HRWR and an aggregate top size of 8 mm. Alkali-free accelerator is dosed at the nozzle at 3–8% by mass of cement; sulfate-rich accelerators can alter the fibre-matrix bond and early-age shrinkage, which changes the measured residual flexural strength. Rebound is measured in the field according to EFNARC 1996 section 5.4; panels and cores are cut for flexural testing under EN 14488-3 and compressive testing under EN 14488-2. In production, a slump loss below 120 mm before spraying creates uneven fibre distribution and poor encapsulation; re-tempering with water at the nozzle is not permitted. The placed lining is cured by wet hessian or membrane curing compound for at least 7 days. Published data for Q-11 under realistic tunnel ventilation and chloride conditions is limited; a trial panel is required for each mix and accelerator combination. Terminal elements include permanent shotcrete linings in road and rail tunnels, rock slope buttress walls, and temporary support in shaft sinking.
| Application | Q-11 dosage | Critical fibre length | Primary test standard | Key control variable |
|---|---|---|---|---|
| Seismic frames | 0.5–1.2 vol% | 12 mm | ASTM C1609/C1609M-19a | Air content |
| Wet-mix shotcrete | 0.4–1.1 vol% | 12 mm | EN 14488-3 | Pump pressure |
| Precast facades | 0.5–1.5 vol% | 8 mm | ASTM C1609/C1609M-19a | Vibration time |
| Slabs on grade | 0.4–1.0 vol% | 12 mm | ASTM C1550-20 | Trowel timing |
| Repair overlays | 0.3–1.0 vol% | 8 mm | ASTM C1581/C1581M-18a | Thickness-to-fibre ratio |
| Marine/hydraulic | 1.0–2.0 vol% | 12 mm | ASTM C1138-19 | Curing duration |
The connection between fibre type and demoulding damage in architectural precast panels is controlled by edge stress at form release and early-age tensile strain capacity. Q-11 is charged into a planetary pan mixer at 0.5–1.5 vol%; thin facade panels with face thickness of 40–60 mm use 8 mm fibre to limit surface read-through. Wet mixing continues for 60–90 s after fibre addition; extended mixing in low-paste mixtures can break up the fibre bundle into individual filaments but also raises mix temperature. After placing into steel moulds, external vibrators are operated at 3,000–6,000 vpm for 20–40 s per station; over-vibration drives fibres toward the bottom face and produces anisotropic flexural performance. Demoulding is scheduled when compressive strength reaches 15–20 MPa; the presence of Q-11 increases edge splitting resistance and reduces strike-induced spalling at reveals and panel returns. Steam curing follows a ramp of 15°C/h to a hold temperature of 55–60°C for 6–8 h; the internal concrete temperature is held below 65°C to avoid delayed ettringite formation. Initial type testing is documented under EN 14889-2:2006, and flexural performance is evaluated by ASTM C1609/C1609M-19a. For acid-etched or polished exposed surfaces, a preliminary facade mock-up is necessary because fibre visibility may vary with vibration energy and form release agent. Published data for Q-11 in thin architectural panels with polished surfaces is limited. Terminal components include architectural cladding panels, sandwich wall skins, ribs, and stay-in-place formwork.
Where laser-screeded slab-on-grade concrete is placed in logistics warehouses and container yards, the acceptance parameter often shifts from compressive strength alone to energy absorption under central point load. Sinopec-SVW Q-11 is batched at 0.4–1.0 vol% in a central mix plant and delivered in truck mixers with a permissible transit time of 30–45 min. The placement slump is 140–160 mm; fibres reduce surface bleed water but do not prevent evaporation at high wind speeds. Round panel testing is performed under ASTM C1550-20; a minimum absorbed energy of 40 J at a central deflection of 40 mm is often specified for racking aisles, though contractual limits vary with slab thickness and subgrade friction. Power trowelling is delayed until the surface water sheen disappears; early trowelling can expose fibres and produce surface fuzz that requires additional finishing. Saw-cut joints are executed at 24–36 h after placement; fibre presence is not used to increase joint spacing unless a shrinkage and curling analysis is prepared. Published data for Q-11 in jointless racking floors is limited, and joint load-transfer devices are still required at construction joints. Terminal elements include warehouse floor slabs, cross-dock facilities, container yards, and maintenance hangars.
Concrete repair systems requiring restrained shrinkage crack control use Q-11 at 0.3–1.0 vol% in a polymer-modified or shrinkage-compensated overlay mortar. The substrate is prepared by grit blasting to a concrete surface profile of CSP 5–7 according to ICRI 310.2R-2013. Bond strength is verified by ASTM C1583/C1583M-13 at 7 days and 28 days; a minimum direct tensile pull-off value of 1.5 MPa is commonly required for bridge deck overlays, subject to agency specification. Fibre length is limited to 8 mm; overlay thickness should be at least three times the fibre length to avoid shadowing and anisotropic distribution. The mortar is placed by a vibrating beam and covered with wet burlap within 15 min after finishing. Restrained shrinkage testing under ASTM C1581/C1581M-18a indicates that Q-11 at or above 0.5 vol% delays crack initiation and reduces average crack width to below 0.1 mm when the water-cement ratio is held at 0.40–0.45 and continuous moist curing is maintained for 7 days. Overdosing above 1.0 vol% in overlay mortars may reduce pumpability and require a viscosity-modifying admixture, creating a placement speed trade-off. Q-11 is not intended to replace crack-bridging membranes in conditions where existing cracks are expected to move more than 0.3 mm. Terminal elements include bridge deck overlays, parking garage ramp repairs, tunnel invert overlays, and concrete balcony restorations.
The splash zone of breakwater armour units and the spillway aprons of hydraulic structures require concrete that tolerates wet-dry cycling, salt crystallisation, and waterborne aggregate abrasion. Q-11 is dosed at 1.0–2.0 vol% in a central mix plant; dosage in this range improves abrasion resistance while increasing demand for a polycarboxylate-based HRWR. Abrasion resistance is assessed under ASTM C1138-19 using the underwater steel ball method; a test duration of 72 h is standard, and specified mass loss is commonly held below 2.0–5.0% depending on aggregate hardness. Chloride migration is measured by NT Build 492; PVA fibre does not corrode and does not create a galvanic pathway, but Q-11 does not remove the need for EN 206 exposure class XS2/XS3 cover and low water-cement ratio. Placement of heavily reinforced splash zone sections with fibre above 1.5 vol% may reduce internal vibration efficiency; immersion time per vibrator point is increased by 5–10 s to release fibre-trapped air. Wet curing is extended to 14 days; early drying produces surface shrinkage cracks that allow chloride ingress regardless of fibre content. Published data for Q-11 in tropical splash zone exposure is limited; a marine exposure panel programme is recommended before full production. Terminal elements include armour units, sheet pile infill, spillway aprons, canal linings, and tidal pool walls.
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Sinopec-SVW Q-11 High Strength High Modulus PVA Fiber (HSHM PVA Fiber) is a high-orientation polyvinyl alcohol monofilament supplied in cut lengths for concrete and mortar reinforcement. The Q-11 designation covers a high-crystallinity grade with tensile properties above commodity PVA staple. The fiber is normally available in cut lengths of 6 mm, 8 mm, and 12 mm; classification under ASTM C1116/C1116M is as a Type III synthetic fiber. Evaluation against EN 14889-2:2006 places the product within the polymer-fiber specification family for concrete. In contrast to polypropylene monofilament, the surface of Q-11 is hydrophilic and stable under alkaline pore-solution conditions, supporting anchorage through polar interaction with cement hydrates instead of mechanical deformation. The product is batched into ready-mixed concrete, precast elements, and wet- or dry-process shotcrete at typical addition rates from 0.1% to 1.5% by volume. Lot-specific tensile properties should be taken from the manufacturer’s certificate of analysis, because published independent testing on the exact Q-11 configuration remains limited.
Its geometry places it in the microreinforcement category. The HSHM class is commonly reported with an equivalent diameter between 14 µm and 40 µm; macrosynthetic fibers typically have equivalent diameters above 0.1 mm, so Q-11 does not meet the usual geometric definition of a structural macrofiber. For a 12 mm cut length at 40 µm diameter, the aspect ratio is approximately 300; a 6 mm cut at 14 µm diameter yields an aspect ratio above 400. The number of fibers per kilogram for a 12 mm, 40 µm filament is on the order of 5 × 10⁷; at 14 µm diameter, the count rises to approximately 4 × 10⁸. These high aspect ratios create a dense microcrack-bridging network but also increase the risk of agglomeration in low-workability concrete. In restrained plastic-shrinkage testing under ASTM C1579, HSHM PVA fiber addition rates of 0.25% to 0.50% by volume have produced crack-area reductions exceeding 70% in laboratory slabs, though published data for the Q-11 configuration is limited and aggregate grading shifts the result. Micro-mechanical estimates indicate that for a fiber tensile strength of 1,300 MPa and interfacial bond in the range 2–4 MPa, the critical transfer length is approximately 2.3–4.6 mm for a 14 µm filament and 6.5–13 mm for a 40 µm filament. The fiber does not provide the post-crack residual strength associated with hooked-end steel fiber in ASTM C1609/C1609M testing; it is not a direct structural macrofiber substitute in that sense.
Table 1 summarises class-representative material properties for HSHM PVA fiber from which Q-11 is drawn. The values are not guaranteed lot averages; certificates of analysis govern acceptance.
| Property | Unit | Typical HSHM class range | Test basis |
|---|---|---|---|
| Cut length | mm | 6, 8, 12 | supplier specification |
| Equivalent diameter | µm | 14–40 | optical microscopy |
| Tensile strength | MPa | 1,100–1,500 | ASTM D3822 |
| Tensile modulus | GPa | 35–43 | ASTM D3822 |
| Elongation at break | % | 6–10 | ASTM D3822 |
| Density | g/cm³ | 1.29–1.30 | ISO 1183-1 |
| Alkali resistance, strength retention after 28 d immersion in saturated Ca(OH)2 at 20 °C | % of original | ≥95 | internal soak per EN 14889-2 principles |
Production-scale batching of Q-11 involves two competing constraints: enough shear to separate individual filaments and enough free-water mobility to avoid static agglomeration around mixer blades. In twin-shaft compulsory mixers, the fiber dose is introduced most uniformly after aggregate wetting and before cement. Direct dumping of the full fiber charge onto dry aggregate can create static-charged clumps at the charging cone; staggered addition over 45–60 s through a vibratory sieve is preferred. After fiber introduction, mixing time is extended by 30–60 s beyond the baseline homogenization period. For pan-type counter-current mixers, blade tip speeds of 1.5–3.0 m/s are generally sufficient; higher speeds increase filament breakage and generate fiber lint at shaft seals. Water-to-binder ratio is the principal variable controlling dispersion. At w/c below 0.32, the paste film may be too thin to separate high-aspect-ratio fibers, and additions above 0.50% by volume typically require a mid-range water reducer or pre-dispersion in water slurry. In zero-slump dry-cast production, dosages above 0.25% by volume usually require a compensatory paste-volume increase of at least 10 L/m³ to preserve compaction under external vibration. Storage in moisture-resistant bags below 70% relative humidity reduces static charge accumulation and clumping; fibers exposed above 85% RH may require pre-drying at 60 °C before dry dosing.
Compared with hooked-end steel and polypropylene monofilament, Q-11 occupies an intermediate position in density, modulus, and interfacial bonding. The differences determine dosing strategy and long-term crack-control behaviour rather than acting as simple one-to-one substitutions.
| Property | Unit | Q-11 HSHM PVA | Commodity PVA | Polypropylene monofilament | Hooked-end steel fiber |
|---|---|---|---|---|---|
| Tensile strength | MPa | 1,100–1,500 | 700–1,000 | 400–700 | 1,000–2,000 |
| Tensile modulus | GPa | 35–43 | 25–35 | 3.5–8.0 | 200–210 |
| Density | g/cm³ | 1.29–1.30 | 1.25–1.30 | 0.90–0.92 | 7.85 |
| Elongation at break | % | 6–10 | 8–15 | 15–30 | 1.5–3.0 |
| Bonding mechanism | — | polar/hydrogen bond to C–S–H | polar but lower stiffness | hydrophobic frictional | mechanical end hook and friction |
| Corrosion behaviour | — | alkali stable, no metallic corrosion | alkali stable | alkali stable | corrosion possible at crack openings unless protected |
Because of the density difference, a steel-fiber dosage of 40 kg/m³ is equivalent to 0.51% by volume; the same fiber volume with Q-11 is approximately 6.6 kg/m³. Mass-only substitution from steel to PVA can produce large fiber counts and paste-demand changes unintended by the specifier.
Substitution is limited to crack-control functions, not primary flexural or shear reinforcement. In slab-on-grade mixtures, addition rates of 0.25% to 0.45% by volume are used for early-age random cracking and surface quality, while welded wire or structural bar remains necessary for joint load transfer. The dosage should be reduced with maximum aggregate size above 20 mm, because short fibers are less effective in bridging mortar-rich zones around coarse aggregate. For precast segment jackets, pumpability is affected above 0.50% by volume; bentonite-free mortar and a polycarboxylate water reducer are generally required to maintain slump flow between 160 mm and 220 mm. In wet-process shotcrete, fiber addition at the hopper rather than the nozzle yields more uniform distribution and lower rebound. Partial cement replacement with silica fume or metakaolin increases paste viscosity and may require reduced fiber addition at w/b ratios below 0.30. Published flexural toughness data for Q-11 under ASTM C1550 are limited; qualification panels should be shot and tested before replacing steel fibers in any structural lining or segment application.
Polyvinyl alcohol derives long-term performance in concrete from a high degree of hydrolysis, typically above 99 mol% for high-strength grades, and from a carbon–carbon backbone that resists alkaline hydrolysis. In saturated Ca(OH)2 at 20 °C for 28 d, HSHM PVA fibers of this class retain more than 95% of original tensile strength; at 60 °C, the retention value decreases, and heat-cured precast applications should be qualified by lot-specific testing. The fiber does not undergo chloride-driven metallic corrosion, but its tensile response is temperature-sensitive. Prolonged exposure above 180 °C leads to decomposition rather than melting, so Q-11 should not be specified as structural fire protection. Bond-slip behaviour is matrix-dependent. In concretes with cube compressive strength above 60 MPa when tested to EN 12390-3, pullout may become brittle and fiber rupture can occur; in lower-strength matrices, the same fiber may pull out because the matrix fails before the fiber. This behaviour contrasts with polypropylene, which slips at lower interfacial stress due to its hydrophobic surface, and with steel fibers, which mobilize mechanical anchorage. The comparison matters when plastic-shrinkage control is the performance objective, because excess bond can reduce workability without proportionally increasing post-crack toughness.
Conformance documentation should include the certificate of analysis, cut-length distribution, lot average tensile strength, and alkali-resistance screening results. Under ASTM C1116/C1116M, Type III synthetic fiber classification does not remove the need for concrete performance testing under ASTM C1579, ASTM C1609/C1609M, or project-specific shotcrete panel requirements. Projects requiring compliance with EN 14889-2:2006 should require the manufacturer’s declaration of performance and conditioning report for each delivery lot.
