Polyoxymethylene fibers in concrete

A technology of concrete and polyoxymethylene copolymer, applied in the direction of fiber chemical characteristics, one-component polyether artificial filament, one-component polyurethane artificial filament, etc.

Inactive Publication Date: 2012-07-25
TICONA LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Despite improvements in composites incorporating fibrous polymeric materials, there is still room for further improvements and variations in the state of the art

Method used

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  • Polyoxymethylene fibers in concrete
  • Polyoxymethylene fibers in concrete
  • Polyoxymethylene fibers in concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] POM fibers are formed from the following monomer reactants:

[0093] 1) Use BF 3 Initiators and formal chain transfer agents make three Alkanes are polymerized with 1,3-dioxolane - called POM.

[0094] 2) Use BF 3 Initiators and glycol chain transfer agents make three Alkanes are polymerized with 1,3-dioxolane - called POM-OH.

[0095] 3) Use BF 3 Initiators and glycol chain transfer agents make three Polymerization of alkanes with glycerol formals - known as pendant OH-POM.

[0096] POM fibers are formed using a twin screw reactor with mixing, grinding and conveying sections. The L / D of the reactor was 15:1. The feed rate was 10000 to 20000 lb / hr. Dioxolane concentration is 3.4 (to 6.2)% (w / w), methylal concentration is about 600ppm, BF 3 is 10 to 20 ppm. The screw speed was about 30 rpm. The temperature in the reactor was 90°C-95°C. The base polymer was quenched with triethylamine in a methanol / water solvent as it exited the reactor, followed by soluti...

Embodiment 2

[0102] POM, POM-OH and PP fibers formed as described in Example 1 were mixed with wet concrete and used in experimental sidewalk casts. The portion using only polypropylene fibers showed a significant concentration of fibers on the surface. This result was used to test the prediction that the combination of increased hydrophilicity and higher density of POM fibers would generally lead to greater miscibility of POM fibers relative to polypropylene fibers in the wet concrete matrix.

Embodiment 3

[0104] During the walkway casting of Example 2, concrete cylinders were also cast using different concretes incorporating different fibers as additives. The compressive strength values ​​of the concrete cylinders were measured. The result is as figure 2 shown. It can be seen that the observed trends are consistent with the improved secondary reinforcement of concrete provided by POM fibers, which exhibit improved toughness and adhesion compared to polypropylene fibers.

[0105] figure 2 It is shown that there is little difference between polypropylene and POM fibers, indicating that the increase in the polarity of the POM fibers has little effect on the increase in the strength of the concrete, although it brings about an increase in miscibility. This is probably due to the fact that in the standard POM -C 2 Low content of OH end groups. On the other hand, the compressive strength of the samples comprising POM-OH was significantly higher than that observed for the sampl...

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Abstract

Disclosed are polymeric additives for concrete formed of a polyoxymethylene (POM) copolymer. POM copolymers can be utilized to form fibrous additives for concrete, i.e., microfibers and/or macrofibers. The POM copolymers can include one or more chemical groups, e.g., end groups and/or pendant groups that can increase the polarity of the POM and increase the hydrophilicity of the formed fibers, which can improve miscibility of the fibers in wet concrete. Chemical groups of the POM copolymers can bond with components of the concrete or can hydrolyze to form groups that can bond with components of the concrete, e.g., form covalent or noncovalent (e.g., electrostatic or ionic) bonds with one or more components of the concrete binder.

Description

Background technique [0001] Concrete is the most commonly used man-made building material in the world. Concrete includes a binder component and an aggregate component. The binder component is cement, usually formed from a calcined limestone-based composite material, and the aggregate component is usually formed from quartz sand or calcium carbonate. [0002] The performance of concrete has been improved in the past by combining the concrete with modifying additives. Typical modifications to improve concrete include the addition of fibrous materials such as metals, polymers, glass and natural fibers to the binder, and molding in conjunction with steel reinforcement. Synthetic fibers have been used as concrete reinforcements for decades, especially in slabs for grade applications. Fiber-reinforced concrete can exhibit reduced shrinkage, reduced permeability, and even increased resistance to abrasion and crushing, depending on the specific materials used in the composite. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B16/06
CPCD01F6/78C04B28/02C04B16/0675C04B2103/0051D01F6/66D01F6/70Y10T428/298
Inventor S·巴塞蒂R·M·格罗纳T·海尔H·许克施泰特A·卡兰迪卡
Owner TICONA LLC
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