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Modified bamboo fiber/polymer composite high toughness concrete and preparation method thereof

A bamboo fiber and high-toughness technology, applied in the field of modified bamboo fiber/polymer composite high-toughness concrete and its preparation, can solve the problems that affect the overall safety and service life of buildings, cracks easily occur in concrete, and the brittleness of concrete is high. Microscopic stress-strain properties, excellent mechanical properties, and excellent mechanical properties

Active Publication Date: 2015-11-18
FUJIAN JUAN CONSTR ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of traditional concrete, such as high brittleness and low flexural strength, lead to cracks or even fractures in concrete, which seriously affects the overall safety and service life of these buildings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0072] The preparation method of polyurethane toughening emulsion comprises the following steps:

[0073] 1) Stir 30kg of polyether diol and 22.5kg of polypropylene glycol at 110°C under vacuum for 1 hour, then cool to room temperature;

[0074] 2) Add 17kg of toluene-2,4-diisocyanate, 21.5kg of 3-isocyanatomethylene-3,5,5-trimethylcyclohexyl isocyanate and 0.25kg of dibutyltin dilaurate to the emulsion in step 1) , the temperature was slowly raised to 82 ° C while stirring within 1 h, and then continued to stir at 82 ° C for 2 h and then cooled to room temperature;

[0075] 3) Add 20kg of N,N-dimethylacetamide solution dissolved with 10.5kg of dimethylolbutyric acid into the emulsion in step 2) within 0.5h, and stir within 1.5h after the addition is complete Slowly raise the temperature to 85°C, continue stirring at 85°C for 2.5h and then cool to room temperature;

[0076] 4) Add 1.4kg of ethylene glycol to the emulsion in step 3), slowly raise the temperature to 85°C while...

Embodiment 1

[0081]1. The modification method of activated bamboo fiber comprises the following steps: at 23°C, 0.7kg coupling agent is added to 90kg of water, stirred until it dissolves completely; at 20°C, 9kg of activated bamboo powder is added to In the above-mentioned aqueous solution containing coupling agent, stir for 0.5h, heat up to 50°C, stir for 8.5h, put the bamboo powder in an industrial centrifuge after filtration, centrifuge at 500r / min for 10min, and vacuum the bamboo powder at 53°C Dry for 24 hours; put the obtained bamboo powder and 3.5kg maleic anhydride graft copolymer into a high-speed mixer at 27°C, mix at 280r / min for 2.5h, then heat up to 108°C, and mix at 430r / min for 7min , put it into a cold mixing pot to cool, and discharge the material when the temperature drops to 45°C to obtain the initial mixture; place the initial mixture in a twin-screw extruder with a temperature of 165°C and a rotational speed of 55r / min for 0.5 Extrude after h to obtain a mixed material...

Embodiment 2

[0119] 1. The modification method of activated bamboo fiber comprises the following steps: at 25°C, 1.0kg of coupling agent is added to 100kg of water, stirred until it dissolves completely; at 23°C, 10kg of activated bamboo powder is added to In the above-mentioned aqueous solution containing coupling agent, stir for 0.5h, heat up to 51°C, stir for another 10h, filter and place the bamboo powder in an industrial centrifuge, centrifuge at 500r / min for 10min, then vacuum-dry the bamboo powder at 55°C 24 hours; at 30°C, the resulting bamboo powder and 3.5kg maleic anhydride graft copolymer were packed into a high-speed mixer, mixed at 300r / min for 3h and then warming up to 109°C, then mixed at 450r / min for 8min, then put Put it into a cold mixing pot to cool, and discharge the material when the temperature drops to 45°C to obtain the initial mixture; place the initial mixture in a twin-screw extruder with a temperature of 170°C and a rotational speed of 60r / min for 0.5h and knead...

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Abstract

The invention discloses a modified bamboo fiber / polymer composite high-toughness concrete and a preparation method thereof. In the method, bamboo fibers are modified successively through a coupling agent and a maleic anhydride grafted terpolymer and are added to an epoxy resin toughening emulsion. With water, the epoxy resin toughening emulsion containing the modified bamboo fibers, a polyurethane toughening emulsion, cement, coal ash, slag powder, a fine aggregate, crushed stone and a water reducing agent are employed as raw materials, the modified bamboo fiber / polymer composite high-toughness concrete are prepared through a stirring and mixing process. A test proves that the high-toughness concrete has a significant strain hardening characteristic or a significant deformation hardening characteristic under an effect of a direct stretch load of a direct bending load. The high-toughness concrete has a bending strength being 17-26 MPa, a compressive strength being 75-92 MPa and a tensile strength being 6-15 MPa. The high-toughness concrete can be applied in fields such as a bridge floor of a long-span cross-sea or cross-river bridge, the bridge floor of a viaduct of a high-speed railway, and various tunnel arch walls, in a subway and the like, and the like.

Description

Technical field [0001] The invention is the field of building materials, which involves a modified bamboo fiber / polymer composite high tough concrete and its preparation methods. Background technique [0002] The bridge decks of high -speed rail viaducts and large span bridges, as well as building structures and parts such as various types of tunnel arch walls, have complicated stress environment.The disadvantages of traditional concrete crispy and low bending strength have caused concrete to produce cracks or even fractures in use, which seriously affects the overall safety and service life of these buildings.Therefore, in these buildings, high tough concrete materials must be used as high as possible. [0003] Polyethylene fiber, polyester fiber, Dura fiber, etc. have been adopted, and corresponding concrete products have been developed.my country has a large number of bamboo forest resources, compared with carbon fiber, steel fiber, glass fiber, Fuxi fiber, steel wire / steel wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B24/28C08F283/10C08G18/66C08G18/48C08G18/32C08L51/08C08L97/02C08L75/08
Inventor 陈文豹张祖华陈清海蒋国平
Owner FUJIAN JUAN CONSTR ENG CO LTD
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