Ductal® FM
Ultra-High-Strength Fiber Reinforced Concrete
This page provides information on ultra-high-strength fiber reinforced concrete (UFC) that exhibits high strength performance, durability, and toughness.
ductal
Ductal® Full Premix
Ductal® Full Premix is comprised of the Ductal® Premix material, special fibers, and a special water-reducing agent. This product is a standard mixed powder as defined in the Recommendations for Design and Construction of Ultra-High-Strength Fiber Reinforced Concrete Structures (Draft) issued by the Japan Society of Civil Engineers. It uses a variety of carefully selected materials for its cement base material and is manufactured under a strict quality control system. The use of Ductal® Premix eliminates the need for concrete mix design, thereby enabling the manufacture of stable-quality structural elements.
The product lineup also includes Ductal® FM (Fiber Metallic), which uses special metallic fiber, and Ductal® FO (Fiber Organic), which uses organic fiber. Select the product best suited to your purpose.
Ductal®’s Performance
The use of Ductal® Premix standard mixed powder results in a more solid hardened body than with standard heat curing (48-hour steam curing at 90℃). Ductal®'s superior performance goes far beyond ordinary concrete, delivering markedly improved dynamic properties and material properties, such as durability.
Based on Ductal®'s performance, the Recommendations for Design and Construction of Ultra-High-Strength Fiber Reinforced Concrete Structures (Draft) defines its design service life as 100 years (for Ductal® FM).
From the JSCE Guidelines (Draft)
Ultra-high strength fiber-reinforced concrete: Design values (Ductal-FM)
| Item | Unit | Design values |
|---|---|---|
| density | g/cm³ | 2.55 |
| Compressive strength | N/mm² | 180 |
| Tensile strength | N/mm² | 8.8 |
| Cracking strength | N/mm² | 8 |
| Young’s modulus | kN/mm² | 50 |
| Poisson's ratio | — | 0.2 |
| Creep coefficient | — | 0.4 |
Example of a flexural load-deflection curve
Example of test results
| Item | Unit | Ductal® FM | Ductal® FO | ||
|---|---|---|---|---|---|
| Design value | Test value | Reference design value | Test value | ||
| Density | g/cm³ | 2.55 | 2.55 | 2.41 | 2.41 |
| Compressive strength | N/mm² | 180 | 210 | 130 | 160 |
| Bending strength | N/mm² | — | 43 | — | 22 |
| Tensile strength | N/mm² | 8.8 | 10.8 | 2.5 | 8.5 |
| Young’s modulus | kN/mm² | 50 | 54 | 45 | 46 |
- Ductal® physical property values and test results are based on specimens subjected to standard heat curing after demolding (steam curing at 90℃ for 48 hours).
- Ductal® compressive strength is based on φ5×10cm specimens, and bending strength on 4×4×16cm specimens.
Mass transfer properties of Ultra-High-Strength Fiber Reinforced Concrete (Ductal-FM)
| Ultra-High-Strength Fiber Reinforced Concrete | Conventional concrete | |
|---|---|---|
| Compressive strength | 150 N/mm2or more | 18 to 80 N/mm2 |
| Water-cement ratio | 0.24 or less | 0.3 to 0.6 |
| Air permeability coefficient | 10−19m2or less | 10−17 to 10−15m2 |
| Hydraulic conductivity coefficient | 4×10−17x | 10−11 to 10−10cm/s |
| Diffusion coefficient of chloride ions | 0.0019 cm2/year | 0.14 to 0.9cm2/year |
| Porosity | Approx. 4vol.% | Approx. 10vol.% |
- Based on the Recommendations for Design and Construction of Ultra-High-Strength Fiber Reinforced Concrete Structures (Draft)
Impact Resistance
A steel ball (1.5 kg) is allowed to freefall 3,000 times, and then the volume of resulting depression is measured. Results show that Ductal® possesses about five times the strength of ordinary concrete.
Ductal® FO
Ordinary concrete
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