ECC high-extended concrete is a kind of high ductility fiber reinforced cement-based composites. Based on the design principle of micromechanics, fiber reinforced composites based on cement and quartz sand have high strength, high toughness, high crack resistance and high damage resistance compared with ordinary concrete.
GENERAL
ECC high-extended concrete is a kind of high ductility fiber reinforced cement-based composites. Based on the design principle of micromechanics, fiber reinforced composites based on cement and quartz sand have high strength, high toughness, high crack resistance and high damage resistance compared with ordinary concrete.
FEATURE
Product features
◆Bending performance: it shows deflection hardening characteristics; The joints are fractional and fine;
Multi crack construction --- crack without damage --- is also known as "bendable concrete".
◆Tensile properties: strain hardening during tensile; The strength of the specimen can be maintained after cracking; The ultimate tensile strain is more than 100 times that of ordinary concrete.
◆It has high fatigue resistance and impact resistance ◆Obvious seismic reinforcement effect. ◆Fast and convenient construction and short construction period; The comprehensive cost is lower than the traditional reinforcement scheme
◆Self compacting: it has strong anti segregation ability and does not need to be tamped and vibrated
◆Fire resistance: at high temperature, the fiber will dissolve to form a migration channel of water vapor, so as to release the vapor in the component and avoid the decomposition and damage of cement matrix.
◆Self healing: strong self-healing ability improves the durability of components in changing environment.
◆Good environmental performance
Scope of application
◆It is suitable for external layer structural engineering reinforcement of high ductility polymer mortar.
◆Seismic reinforcement and reconstruction of reinforced concrete beams, columns, plates, walls and other structures.
◆It is suitable for all structures with easy bending structure, especially for the slab and beam of reinforced concrete bridge, a representative bending structure of civil architecture.
◆It is applicable to the cracked parts of pier, main tower shaft and expressway cement pavement. It has the same system as the previous reinforced concrete structures.
◆When honeycomb, loophole, crack, protective layer damage, reinforcement leakage and other defects appear in the concrete, the surface repair works shall be carried out.
◆Thicken the protective layer, smooth the concave convex surface and repair the old concrete surface to improve the durability of the concrete.
Application of ECC in reconstruction and reinforcement of dangerous buildings | Application of ECC in seismic engineering | Application of ECC in bridge reinforcement engineering | Application of ECC in concrete structure reinforcement engineering |
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Application of ECC in Tunnel Engineering | Application of ECC in bridge expansion joint | Application of ECC in plant floor engineering | Application of ECC in airport pavement engineering |
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PERFORMANCE
Performance metrics
DB34/T3469-2019 Technical Specification for Application of High Ductility Concrete
JC/T2461-2018 Test Method for Mechanical Properties of High Ductility Fiber Reinforced
Cement matrix composites main mechanical property indexes of high ductility concrete
| Testing items | Standard curing age | Technical indicators | ||
| Class Ⅰ | Class Ⅱ | Class Ⅲ | ||
| Equivalent bending toughness (kJ/m3) | 60d | ≥160.0 | ≥120.0 | ≥80.0 |
| Equivalent bending strength (N/mm2) | 60d | ≥11.0 | ≥10.0 | ≥9.0 |
| Flexural strength (N/mm2) | 60d | ≥12.0 | ≥12.0 | ≥12.0 |
| Cube compressive strength (N/mm2) | 60d | ≥50.0 | ≥50.0 | ≥50.0 |
Main durability indexes of high ductility concrete
| Testing items | Technical index |
| Frost resistance test (quick freezing method) | ≥F300 |
| Water penetration resistance test (step-by-step pressurization method) | ≥P12 |
| Chloride ion penetration resistance (RCM method) | ≥RCM-IV |
| Sulfate resistance | ≥KS90 |
| Carbonation resistance | 28d carbonization depth ≤ 2.0mm |
Construction process
1. Foundation surface treatment
Clean the foundation surface as required (if there is a painting layer on the original structural surface, remove the painting layer until the original structural surface), and there shall be no floating slurry, floating ash, oil stain, loose layer and other sundries.
2. Wet construction surface
Before construction, the structural foundation surface must be watered repeatedly to make the structural foundation surface fully wet.
3. Construction ratio
Material A (40kg): material B (a small bag of fiber=320g): water. In order to mix evenly, mix up to 4 parts of material together.
4. Batching method
Put the powder into the mixer, add water and stir for 3~4 minutes (the material reaches the colloidal state), add the prepared special fiber and continue to stir. The next construction can be carried out only after the special fiber is completely dispersed.
Precautions
① No other materials shall be added during the mixing of high ductility concrete, especially water shall not be added at will; In case of technical problems during construction, contact the material party in time.
② The mixer shall be cleaned after each discharge of high ductility concrete until the next mixing.
③ During site construction, if the mixing materials in the mandatory mixer are not used up, the mixer must be started to continue mixing to ensure the fluidity and workability of high ductility concrete in the hopper.
④ In summer: high ductility concrete shall be discharged within 40 minutes, and in winter: high ductility concrete shall be discharged within 60 minutes.
⑤ Winter construction measures shall be taken when the temperature at the construction site is lower than 5 ℃.
Examples
Civil building reinforcement － The reinforced house is a single-layer masonry structure, with a construction area of about 700m2. By strengthening the wall with high ductility concrete surface or strip, the integrity and seismic capacity of the house can be greatly improved, and the problem of insufficient structural measures can be solved. |  | Reinforcement of school safety works － The seismic bearing capacity of some walls is insufficient; Insufficient bearing capacity of floors and beams. The high ductility concrete surface course is used to strengthen the walls whose bearing capacity does not meet the requirements; The beam bottom and slab bottom are reinforced by steel bonding method. |  |
Dangerous building reinforce-ment － Because the strength of masonry mortar and the seismic bearing capacity of some walls do not meet the requirements; The mortar strength is low, and the seismic bearing capacity of the wall does not meet the requirements; The interior and exterior walls are reinforced with high ductility concrete on one and two sides. |  | Bridge expansion joint maintenance － Due to the influence of vehicle load and various factors, the expansion joint is easy to be damaged, and the concrete is vulnerable to crack and damage. ECC high ductility concrete is poured as a whole, which effectively solves the problem of cracking.
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Packaging and storage
Packed in PP bags, with a net weight of 20kg / bag and a shelf life of 3 months;
It must be stored in a dry and ventilated room, and the packaging bag shall be sealed. Avoid moisture and freeze.
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