| HS Code | 137290 |
| Productname | 54mm Macro Synthetic Wave PP Fiber for Shotcrete & Tunnel Support (Steel Fiber Alternative) |
| Material | Polypropylene (PP) |
| Fibertype | Macro Synthetic Wave Fiber |
| Length | 54 mm |
| Equivalentdiameter | 0.8 mm |
| Aspectratio | 67.5 |
| Shape | Wave form |
| Tensilestrength | 550 MPa min |
| Elasticmodulus | 7 GPa min |
| Density | 0.91 g/cm3 |
| Meltingpoint | 160-170 C |
| Alkaliresistance | Excellent |
| Acidresistance | Excellent |
| Waterabsorption | <0.1% |
| Dosagerate | 4-9 kg/m3 |
| Application | Shotcrete and tunnel support |
| Steelfiberalternative | Yes |
| Color | Natural / Black / Gray |
| Packaging | 20 kg bags |
As an accredited 54mm Macro Synthetic Wave PP Fiber for Shotcrete & Tunnel Support (Steel Fiber Alternative) factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Product is packaged in 20 kg moisture-resistant woven bags, 30 bags per 600 kg pallet, with 0.9 kg water-soluble inner bags. |
| Container Loading (20′ FCL) | 20′ FCL container loading: 54mm macro synthetic wave PP fiber for shotcrete/tunnel support, steel fiber alternative, securely packed for export. |
| Shipping | The 54mm macro synthetic PP fibers are packed in moisture-resistant woven bags or jumbo bags, palletized and shrink-wrapped for export. They ship by sea, rail, or truck in standard containers. Store dry, away from sunlight. Non-hazardous, non-flammable, and not classified as dangerous goods. |
| Storage | Store in a cool, dry, well-ventilated warehouse, away from direct sunlight, rain, moisture, and heat or ignition sources. Keep original sealed bags on pallets, off the floor, and protect from sharp objects, punctures, and excessive stacking. Maintain clean, dust-free conditions and use FIFO stock rotation. No special chemical incompatibilities; avoid prolonged UV exposure and high temperatures to preserve fiber performance. |
| Shelf Life | Shelf life: indefinite when stored in original unopened packaging, dry, ventilated area, away from direct sunlight and moisture. |
Permanent single-shell tunnel linings in competent Scandinavian and Alpine rock masses are commonly produced as wet-mix sprayed concrete in which the 54 mm macro-synthetic wave polypropylene fibre is batched with a 0–8 mm continuous aggregate curve at a dosage of 3.5–5.0 kg/m³. The fibre is discharged through the aggregate weigh belt after coarse aggregate dosing but before the twin-shaft paddle mixer receives the cementitious binder; this sequencing prevents fibre balling around the mixer shaft when total batch mixing time is held at 120–150 s after all constituents are charged. Fresh-state workability is specified as slump 140–190 mm measured according to EN 12350-2, with air content 4–7% by EN 12350-7 before delivery to a double-piston wet-mix pump operating at an actual placement rate of 8–15 m³/h through a 50–65 mm ID delivery line. A remote-controlled spraying manipulator applies the material at nozzle air flow 8–12 m³/min; alkali-free liquid accelerator is dosed at 5–8% by mass of binder immediately before the nozzle. The fibre requires no accelerator adjustment, but pump discharge pressure rises by 4–8 bar compared with an unmodified control mix due to higher dynamic yield stress. Hardened lining properties are verified by EN 14488-5 square panel tests, with energy absorption at 25 mm central deflection required to exceed 700 J for J3 energy class applications under EN 14487; 24 h compressive strength is typically specified at 8–12 MPa and 28-day core strength is between C30/37 and C45/55. The terminal product is unreinforced or rock-bolted permanent lining with a thickness of 60–120 mm. Slump values above 200 mm should be avoided because the fibre segregates toward the pump hopper top during idle periods. On production-scale output, the main process constraint is not fibre dispersion but line-pressure spikes above 45 bar, where oriented fibres can temporarily pack at the S-valve and produce a 2–4 s nozzle discharge delay; rebound on overhead sections is typically 10–15% and is not recycled into structural linings because the recovered fraction alters the continuous aggregate grading.
Dry-mix sprayed concrete for circular ventilation shafts, underground pumping chambers, and corroded steel-set rehabilitation is produced by pre-blending the 54 mm wave fibre into bagged dry mortar on a continuous screw conveyor with a weigh-belt tolerance of ±1.0%. The fibre is added after silica fume and before the final bagging stage to limit separation in transport. Because the wave profile is relatively open, dry-state entanglement is lower than for crimped steel fibre, but residual moisture above 0.3% causes fibres to adhere to rotary gun rotor pockets and reduces pass-through rate. Rotor gun output is maintained at 3.0–4.5 m³/h with gun air pressure 6–8 bar and water ring pressure 1.0–1.5 bar above gun pressure. At ambient temperatures below 5°C, static charge accumulation on the synthetic surface creates agglomerates of 10–20 filaments that bridge the gun feed throat; this is controlled by pre-wetting the feed throat with a 0.5–1.0% moisture mist or by using an anti-static feed hose liner. The dry-mix material is specified according to ACI 506.4R-19 and the fibres are required to conform to ASTM C1116/C1116M-23. Panel energy absorption is verified under ASTM C1550-20; published energy absorption values for dry-mix macro-synthetic fibre are more operator-dependent than wet-mix because the water-to-cement ratio at the nozzle is not machine-controlled. The terminal product is a dense repair shell around corroded steel sets or leaking shaft liners, typically 50–90 mm per pass. The process is unsuitable for dry-mix materials containing lightweight aggregate above 10% by volume because the wave fibre segregates from low-density particles during pressurised gun discharge.
Thin spray-on liners in cut-and-fill mining and access drifts in weak, foliated rock require a blast-resistant and deformable support layer that does not corrode in acidic mine water. The polypropylene fibre is dosed at 4.0–6.0 kg/m³ into a wet-mix shotcrete with a maximum aggregate size of 8 mm and water-to-binder ratio 0.40–0.45. A mobile twin-shaft mixer mounted on a Normet Spraymec-series carrier feeds a piston pump with a 125 mm stroke and 65 mm delivery line at 12–18 m³/h. Sprayed concrete is applied in successive 50 mm passes to a final thickness of 90–150 mm, with alkali-free accelerator at 4–6% by mass of binder. Governing sprayed concrete requirements are taken from EN 14487-1:2005; some mining protocols require the lining to remain intact under 40–60 mm of convergence without spalling. Residual strength is tested by ASTM C1609/C1609M-19a on extracted beam specimens and by ASTM C1550-20 on sprayed panels. The terminal product is a passive support layer combined with friction bolts or cable bolts; the polyolefin matrix is inert in pH 3.5 mine water and eliminates conductive sparking at the sprayed surface. The main operational boundary is handling of returned overspray: 54 mm fibre makes rebound aggregate recycling more difficult because the fibres wrap around scalping screens and require a higher-torque shredder if material recovery is attempted.
On cohesionless cut slopes along highway alignments where reinforced shotcrete facing is applied directly to a soil nail grid, the fibre is dosed at 3.0–4.5 kg/m³ and delivered through a trailer-mounted double-piston wet-mix pump with a 40 mm stroke and a 25 mm ID nozzle. The placement is executed after the drainage mat and soil nail heads are secured, with a pump line length not exceeding 80 m because the wave profile increases the effective suspended solids volume. A polycarboxylate ether plasticizer is added at 0.6–1.2% by mass of binder to hold slump at 150–190 mm without raising the water-to-binder ratio beyond 0.45. Piston-face line pressure during pumping is 28–35 bar, which is 15–20% higher than the same mix without fibres; steel-braided hoses with a burst rating above 50 bar are therefore specified. Final facing thickness is 80–150 mm for soil nail head coverage, with a surface tolerance of ±10 mm over a 3 m straightedge. Materials and construction are governed by EN 14487-1:2005 and ASTM C1436-13; fibre conformity is under EN 14889-2:2006 Class II. The terminal product is a crack-distributing facing layer that replaces welded wire mesh where design residual strength is below 3.0 MPa at a crack mouth opening displacement of 1.5 mm measured by ASTM C1609/C1609M-19a. In tropical rainfall areas, the substrate must be drained before spraying; otherwise the fibre-reinforced layer de-bonds from saturated cohesionless soils and develops local thickness loss behind the drain mat.
In large underground hydropower caverns and tailrace tunnel sections where structural shotcrete is placed with an actual output of 18–24 m³/h, the 54 mm fibre is dosed at 5.0–7.0 kg/m³ into a low-water-content mix with water-to-binder ratio 0.36–0.42, silica fume at 8–10% by mass of binder, and a 0–6 mm aggregate curve. The twin-shaft batch mixer discharge is monitored for batch-to-batch variation with a pressure sensor on a 65 mm ID steel delivery line. Fibre-laden shotcrete at this dosage develops a Bingham plastic flow profile with a measured line pressure of 30–38 bar at the pump face, and a pressure drop of 1.2–1.8 bar per 10 m of horizontal line is observed in steady pumping; this restricts maximum line length to 120 m unless a booster pump is used. The material is sprayed in 60–80 mm passes by a computer-controlled manipulator with nozzle indexing pre-set to overlap by 50%. Post-crack performance is measured by EN 14488-5 panel testing, and construction conformity is assessed under EN 14487-2:2005. The terminal product is a structural lining in contact with rock reinforcement systems, where the fibre replaces steel fibre at 25–35 kg/m³ and allows immediate re-entry under 2–4 mm radial deformation. Published data for this exact high-output configuration is limited; therefore panel energy absorption values above 1,000 J should be confirmed by a pre-construction spray trial.
| Application context | Dosage range | Governing system standards | Fibre specification | Post-crack test | Process boundary |
|---|---|---|---|---|---|
| Permanent wet-mix D&B tunnel lining | 3.5–5.0 kg/m³ | EN 14487-1:2005 | EN 14889-2:2006 | EN 14488-5 | Slump ≤ 200 mm |
| Dry-mix shaft and steel-set repair | 2.5–4.0 kg/m³ | ACI 506.4R-19 | ASTM C1116/C1116M-23 | ASTM C1550-20 | Hopper moisture < 0.3% |
| Mining drift and stope support | 4.0–6.0 kg/m³ | EN 14487-1:2005 | EN 14889-2:2006 | ASTM C1609/C1609M-19a | Pass thickness ≤ 50 mm |
| Soil nail slope facing | 3.0–4.5 kg/m³ | EN 14487-1:2005 | EN 14889-2:2006 | ASTM C1609/C1609M-19a | Line length ≤ 80 m |
| High-output cavern structural shotcrete | 5.0–7.0 kg/m³ | EN 14487-2:2005 | EN 14889-2:2006 | EN 14488-5 | Line pressure ≤ 38 bar |
| Electrically isolated rail and switchgear lining | 4.0–6.0 kg/m³ | EN 14487-1:2005 | EN 14889-2:2006 | EN 14488-5 | Project-specific electrical resistivity |
Electrically isolated shotcrete linings in DC rail transit tunnels and underground switchgear vaults are produced with the 54 mm macro-synthetic wave fibre at 4.0–6.0 kg/m³ to avoid the induced current loops and corrosion cells associated with discrete steel fibres in a moist, chloride-bearing environment. The wet-mix is batched with a 0–6 mm aggregate curve and a water-to-binder ratio not exceeding 0.42. Application is performed with a robotic shotcrete manipulator in 50 mm lifts to a final thickness of 80–120 mm, with alkali-free accelerator at 5–7% by mass of binder. The fibres are required to conform to EN 14889-2:2006 as polymer fibres for concrete, and the sprayed concrete system is tested to EN 14488-5 for energy absorption and EN 12390-3 for compressive strength development. The terminal product is a non-metallic passive lining in which the absence of steel fibre reduces direct-current leakage paths and simplifies future non-destructive testing of concrete cover with ground-penetrating radar. Because electromagnetic compatibility limits are project-specific, site-specific electrical resistivity data rather than a universal standard is used to verify the lining; published data for this configuration in rail transit is limited.
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Product code MSWF-54/0.63 identifies a macro synthetic wave polypropylene fiber with nominal cut length 54 mm and nominal equivalent diameter 0.63 mm, supplied as a collated monofilament bundle for wet-mix shotcrete and tunnel support applications where steel fiber corrosion, pump equipment wear, and unit weight are limiting factors. The product is classified as a Type III synthetic fiber under ASTM C1116/C1116-23 and as a polymer fibre under EN 14889-2:2006. The designation “steel fiber alternative” is functional, not a direct mass-for-mass replacement of hooked-end steel fiber; residual flexural performance must be qualified for each concrete matrix, dosage, and accelerator system.
Raw material is a virgin polypropylene formulation with density 0.91 g/cm³ per ISO 1183-1:2019. Tensile strength typically falls in the range 550–650 MPa, with elastic modulus 4.5–6.5 GPa measured per ISO 527-1:2019. The melt peak is 160–170 °C by ISO 11357-3:2018, and water absorption is below 0.1% per ISO 62:2008. The wave geometry increases mechanical anchorage relative to straight round monofilament by introducing periodic lateral displacement along the fiber axis. The pullout anchorage remains lower than a high-deformation steel fiber, but the product distributes a high number of filaments per unit volume at relatively low mass dosage. Calculated fiber count is approximately 30,000–50,000 fibers/kg depending on the final equivalent diameter and batch-specific density.
The numerical values above are typical for macro synthetic polypropylene fibers of this geometry. Published data for the exact wave amplitude and pitch of this product configuration is limited; project specifications should rely on the supplier certificate of analysis and lot-specific test results rather than generic published values.
| Property | Value | Standard or method |
|---|---|---|
| Nominal cut length | 54 mm | Lot measurement |
| Nominal equivalent diameter | 0.55–0.65 mm | Optical microscopy |
| Specific gravity | 0.91 g/cm³ | ISO 1183-1:2019 |
| Tensile strength | 550–650 MPa | ISO 527-1:2019 |
| Elastic modulus | 4.5–6.5 GPa | ISO 527-1:2019 |
| Melting peak | 160–170 °C | ISO 11357-3:2018 |
| Water absorption | <0.1% | ISO 62:2008 |
| Alkali resistance | ≥95% tensile strength retention after 7 d immersion in saturated Ca(OH)₂ at 20 °C | ASTM D543-20 |
| Corrosion resistance | No electrochemical corrosion | Not applicable; polymer article |
The wave geometry generates post-crack pullout resistance through periodic bending of the filament along its length. A straight round monofilament relies primarily on surface friction and limited chemical adhesion. Crimped and embossed polypropylene fibers also improve mechanical anchorage, but the wave configuration reduces interlocking during dry handling and can limit fiber balling in rotating mixers. However, the pullout capacity of a wave macro fiber remains below that of helical or high-deformation steel fiber because polypropylene has lower elastic modulus and lower bond stiffness. In a normal-strength shotcrete matrix of 35–40 MPa compressive strength, fiber pullout rather than fiber rupture is the dominant failure mechanism at the load levels developed in ASTM C1399/C1399-19 residual strength testing.
The product generates a higher fiber count per kilogram than hooked-end steel. With density 0.91 g/cm³ and equivalent diameter 0.63 mm, the calculated filament count is approximately 35,000 fibers/kg; reducing the diameter to 0.55 mm raises the count above 45,000 fibers/kg. A hooked-end steel fiber of 0.75 mm diameter and 35 mm length supplies roughly 6,000–8,000 fibers/kg. The higher polymer fiber count increases discontinuity spacing in the cement matrix, which supports crack-width control, but does not compensate automatically for lower fiber stiffness under sustained flexural load.
Dispersion is governed by the aspect ratio. For a 54 mm length and 0.63 mm equivalent diameter, the aspect ratio is approximately 86. Above aspect ratio 100, clumping risk increases sharply in low-slump shotcrete and in free-fall mixers. This product sits below that threshold but still requires high-shear mixing or controlled batching. The wave geometry further assists separation of individual filaments from the collated bundle once wetting begins.
At dosages of 4–7 kg/m³, the product raises shotcrete toughness and reduces early-age plastic shrinkage cracking. Under ASTM C1550-20 round panel testing, post-crack energy absorption is commonly lower than that of hooked-end steel fiber at 25–30 kg/m³ when the same concrete matrix is used. There is no universal mass conversion factor; equivalence must be established by panel testing at the project dosage, concrete compressive strength, and accelerator type. Some mix designs require 8–9 kg/m³ or more of a macro synthetic fiber to reach the specified post-crack deflection target, while a hooked-end steel fiber may reach the same target at 25–30 kg/m³. Published data for this exact wave configuration is limited, so project-specific qualification is mandatory before structural use.
The lower elastic modulus of polypropylene, 4.5–6.5 GPa compared with 200–210 GPa for steel, produces larger crack widths and greater creep deformation under sustained load. In temporary shotcrete linings and rock support, this difference may be acceptable because the primary requirements are early-age crack control, rebound reduction, and toughness. For permanent tunnel linings subjected to bending, design standards do not permit automatic substitution of steel fiber or welded wire mesh with macro synthetic fiber. The design must be justified through residual flexural strength testing and, where required, long-term creep verification.
| Property | MSWF-54/0.63 wave PP macro fiber | Hooked-end steel fiber, 35 mm | Operational consequence |
|---|---|---|---|
| Tensile strength | 550–650 MPa | 1,100–1,500 MPa | Steel is stronger; PP failure is usually pullout-dominated |
| Elastic modulus | 4.5–6.5 GPa | 200–210 GPa | Steel provides higher post-crack stiffness and smaller crack widths |
| Density | 0.91 g/cm³ | 7.85 g/cm³ | Lower dead load and easier handling for PP |
| Fiber count per kg | 30,000–50,000 | 6,000–8,000 | PP gives more discrete filaments but with lower individual bond stiffness |
| Corrosion | None | Surface passivation required; rust possible at cracked surfaces | PP is suitable for chloride-bearing groundwater and acid sulfate soils |
| Pump line and nozzle wear | Lower | Higher | PP may reduce maintenance in long-distance pumped shotcrete |
| Fire response | Melts at 160–170 °C; may form channels | Retains strength to higher temperature but conducts heat | Different structural fire performance; PP melting may reduce spalling in some concretes |
In wet-mix shotcrete production, the fiber is introduced through a pre-weighed bag dump or automated dosing unit. A twin-shaft counter-current mixer of 3.0 m³ rated output can disperse the fiber at 5 kg/m³ with a mixing extension of 15–25 seconds. Free-fall drum mixers are not recommended for this fiber length because the collated bundles may wrap around rotating blades or accumulate at the drum shell. For truck-mixer delivery, the fiber should be added at the batching plant and mixed at high speed for 5–8 minutes; loose fiber added at the jobsite increases unloading time and creates greater distribution variability.
At a placement rate of 22–28 m³/h through a 125 mm discharge line, the wave geometry has a lower tendency to interlock at hose bends than hooked-end steel. However, the reduced bending stiffness of polypropylene requires verification of line diameter and pump pressure. At nozzle distance of 1.0–1.5 m, rebound of macro synthetic fiber is typically lower than steel fiber at the same dosage because the polymer density is closer to that of the sprayed matrix. The rebound comparison is highly mix-dependent; no value should be applied across differing accelerator types, layer thicknesses, and nozzle operators without field trials.
Compatibility with alkali-free and alkali-activated accelerators must be checked. A rapidly stiffening matrix can immobilize undispersed fiber bundles before complete mixing. In high-temperature shotcrete above 30 °C mix temperature, polypropylene softens slightly but the surrounding cement matrix continues to carry compressive load. Slump control, however, becomes more difficult at elevated temperatures combined with dosages above 6 kg/m³. A high-range water reducer meeting ASTM C494/C494-19 Type F or G is commonly required above 6 kg/m³ to maintain pumpability without exceeding the specified water-cement ratio.
The product is resistant to cement alkalis at pH 12–13. Polypropylene does not corrode in chloride-bearing groundwater, seawater-mixed shotcrete, or acid sulfate soil exposure. The fiber may therefore reduce long-term corrosion-induced cracking compared with steel fiber in aggressive tunnel environments. This advantage is offset by lower structural stiffness; selection must be based on the full performance envelope rather than corrosion resistance alone.
Compliance documentation should include REACH registration for polypropylene articles, RoHS Directive 2011/65/EU compliance for restricted substances, and a safety data sheet indicating no hazardous classification under EC No 1272/2008. The product is not classified as a hazardous polymer article. In alkaline concrete pore solution, immersion testing per ASTM D543-20 indicates essentially 100% tensile strength retention after 28 d; steel fiber surfaces in cracked concrete may exhibit corrosion staining under the same conditions.
Material handling boundaries include storage below 50 °C and protection from direct ultraviolet exposure during extended outdoor storage. Polypropylene can embrittle under prolonged UV radiation unless adequate stabilizers are included. The product is not intended for continuous service temperatures exceeding 80–90 °C. Direct contact with open flame, strong oxidizing acids, or chlorinated solvents should be avoided. Avoid addition of dry fiber as the first component in a mixer before aggregates; localized fiber accumulation at the mixer shell has been observed in production trials when the total fiber charge is added to a dry drum. The fiber should be introduced after coarse aggregate or after the initial wetting stage.
Quality-control testing should include fiber length distribution, equivalent diameter, wave geometry, and tensile strength per production lot. A certificate of analysis should be supplied with each batch. Project acceptance testing should include residual strength per ASTM C1399/C1399-19 or round panel energy absorption per ASTM C1550-20 at the specified dosage and mix design. The fiber is not a direct replacement for steel reinforcement or welded wire mesh unless the design residual strength and durability requirements are verified for the specific tunnel support application.
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