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

A technology of bamboo fiber and high toughness, which is applied in the field of modified bamboo fiber/polymer composite high toughness concrete and its preparation, which can solve the problems affecting the overall safety and service life of the building, the concrete is prone to cracks, and the concrete is brittle. Microscopic stress-strain performance, low cost, and excellent mechanical properties

Active Publication Date: 2014-11-19
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 crac...

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 for 1 h under vacuum conditions, then cool to room temperature;

[0074] 2) Add 17kg of toluene-2,4-diisocyanate, 21.5kg of 3-isocyanatomethylene-3,5,5-trimethylcyclohexylisocyanate and 0.25kg of dibutyltin dilaurate to the emulsion of step 1) During 1 hour, the temperature was slowly raised to 82°C while stirring, and then continued to stir at 82°C for 2 hours 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 0.5 h, and stir within 1.5 h after the addition is complete Slowly raise the temperature to 85°C, and continue to stir at 85°C for 2.5 h, then cool to room temperature;

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

Embodiment 1

[0081] 1. The modification method of activated bamboo fiber comprises the following steps: at 23°C, 0.7kg of 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 aqueous solution containing the coupling agent, stir for 0.5 h, heat up to 50°C, stir for 8.5 h, filter and put the bamboo powder in an industrial centrifuge, centrifuge at 500 r / min for 10 min, then put the bamboo powder at 53°C Under vacuum drying 24 hours; Gained bamboo powder and 3.5kg maleic anhydride graft copolymer are packed in the high-speed mixer at 27 ℃, be warming up to 108 ℃ after 280 r / min mixes 2.5 h, again at 430 r / min After mixing at low speed for 7 minutes, put it into the cold mixing pot to cool, and discharge the material when the temperature drops to 45°C to obtain the primary mixture; put the primary mixture in a twin-screw extruder with a temperature of 165°C and a rotational speed of 55 r / min. Extrude after k...

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 0.5 h, heat up to 51°C, stir for another 10 h, put the bamboo powder in an industrial centrifuge after filtration, centrifuge at 500 r / min for 10 min, then put the bamboo powder at 55°C Under vacuum drying 24 hours; Gained bamboo powder and 3.5kg maleic anhydride graft copolymer are packed in the high-speed mixer at 30 ℃, be warming up to 109 ℃ after mixing 3 h at 300 r / min, then at 450 r / min After mixing at low speed for 8 minutes, put it into the cold mixing pot to cool, and discharge the material when the temperature drops to 45°C to obtain the primary mixture; put the primary mixture in a twin-screw extrusion machine with a temperature of 170°C and a rotationa...

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PUM

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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 belongs to the field of building materials, and in particular relates to a modified bamboo fiber / polymer composite high-toughness concrete and a preparation method thereof. Background technique [0002] The bridge decks of high-speed railway viaducts and long-span bridges, as well as various types of tunnel arch walls and other architectural structures and parts, have complex and harsh stress environments. 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. Therefore, highly ductile concrete materials with the highest possible flexural strength must be used in these buildings. [0003] In order to improve the toughness of concrete, steel bars were adopted earlier and have been used in large quantities until now; after that, various fiber materials with better mechanical pr...

Claims

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Application Information

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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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