Cellulose fiber for concrete

A cellulose fiber and concrete technology, applied in the field of cellulose fiber, can solve problems such as fiber dispersion, affecting fiber application, and affecting concrete construction performance

Inactive Publication Date: 2012-07-11
SHANGHAI LUOYANG NEW MATERIAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional organic synthetic fibers have greatly affected the application of fibers in concrete due to the problems of fiber dispersibility and the impact of concrete construction performance after fiber incorporation.

Method used

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  • Cellulose fiber for concrete
  • Cellulose fiber for concrete

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Embodiment Construction

[0018] The cellulose fiber raw material of the present invention selects coniferous wood, and takes coniferous medium and small-diameter materials such as southern fir and masson pine as raw materials, and obtains wood chips with a length of 20 ± 5 mm in the direction of wood grain, a width greater than 3 mm, and a thickness of 5 ± 1 mm by peeling and slicing. Raw materials; the cellulose fiber preparation process is as follows:

[0019] The first step: high temperature dissociation

[0020] Fill the pressure vessel with wood chips and add enough chemical solution composed of sodium hydroxide and sodium sulfide (the degree of sulfide is 30±5%) to cover the wood chips, heat to 160±10°C, and keep warm for 2-3 hours.

[0021] Step 2: Grinding and sifting

[0022] The high-temperature dissociated slurry is further dissociated from fibers by a disc refiner, and is purified by sieve washing to form a slurry with a concentration of 1% to 5%.

[0023] The third step: purification

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Abstract

The invention discloses a cellulose fiber for concrete. The physicochemical properties of a monofilament of the cellulose fiber are as follows: the fiber average length is not less than 2mm; the fiber average width is 15-60 [mu]m; the fiber volume density is 1.0-1.6g/cm<3>; the fiber tensile strength is not less than 300MPa; the fiber elastic modulus is not less than 3GPa; and the fiber alkali resistance is not less than 90%. The cellulose fiber for concrete is used in the form of a product of a rectangular sheet paddle board with a side length of 2-20mm, and the quality indexes of the paddleboard of the cellulose fiber are as follows: the fixed amount is 400-1000g/m<2>; the water content is not more than 20%; and the whiteness is not less than 75% (ISO (International Standardization Organization) standard). The cellulose fiber disclosed by the invention is easily dispersed in the concrete, so that the comprehensive performances of the concrete such as anti-cracking performance, toughness and durableness and the like can be improved.

Description

technical field [0001] The invention relates to a cement-based composite additive-type functional material, in particular to a cellulose fiber used in concrete. Background technique [0002] The fibers used in engineering to improve the crack resistance, toughness and durability of concrete have different material properties such as fiber length, diameter, and fiber surface hydrophilicity and hydrophobicity, so that the dispersion performance of fibers in concrete and the concrete after adding fibers There is a big difference in the working performance of fiber reinforced concrete, which directly affects the performance of fiber concrete in terms of crack resistance, mechanical properties and durability. Due to the problems of fiber dispersibility and the influence of concrete construction performance on the traditional organic synthetic fiber, the application of fiber in concrete has been greatly affected. Contents of the invention [0003] The technical problem to be so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B16/02
Inventor 刘国平施慧聪
Owner SHANGHAI LUOYANG NEW MATERIAL TECH
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