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A kind of additive for concrete toughening and preparation method thereof

A technology for concrete and additives, applied in the field of materials, can solve the problems of high brittleness, fracture, complex structural stress environment, etc., and achieve the effects of good toughness, easy raw materials, and simple preparation conditions

Active Publication Date: 2017-07-18
云南泺决建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ordinary concrete has low flexural strength and high brittleness, especially in buildings such as subway tunnel arch walls and cross-sea and river bridges. The structural stress environment is complex, and ordinary concrete is prone to cracks or even breaks during use, which seriously affects the service life of the building. and safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Preparation of modified composite carbon nanomaterials:

[0040] 1) Put 62 stainless steel balls with a diameter of 5 mm and 46 stainless steel balls with a diameter of 10 mm in two identical 6 L nylon ball mill jars, and then add 1.4 kg of high-purity ultrafine graphite powder and multi-walled nano Carbon tubes are composed of composite carbon materials with a mass ratio of 1.5:1, and then 120 mL of absolute ethanol is added dropwise, sealed with a nylon cover, and two ball mill jars are symmetrically placed in the ball mill. Ball milling treatment for 60h under the condition of automatic conversion of rotation direction;

[0041] 2) The composite carbon material treated in step 1) was added to the Tween 40 aqueous solution with a pH value of 8 and a mass concentration of 16%, ultrasonicated for 15 h, filtered, and the resulting filter residue was washed with water and dried in vacuum at 60 °C for 20 h ;

[0042] 3) The composite carbon material treated in step 2)...

Embodiment 2

[0053] 1. Preparation of modified composite carbon nanomaterials:

[0054] 1) Put 62 stainless steel balls with a diameter of 5 mm and 46 stainless steel balls with a diameter of 10 mm in two identical 6 L nylon ball mill jars, and then add 1.4 kg of natural single crystal graphite powder and multi-wall The composite carbon material composed of carbon nanotubes at a mass ratio of 1.5:1 was added dropwise with 120 mL of absolute ethanol, sealed with a nylon cover, and two ball mill jars were symmetrically placed in the ball mill. 60 hours of ball milling under the condition of automatically changing the direction of rotation;

[0055] 2) The composite carbon material treated in step 1) was added to the Tween 40 aqueous solution with a pH value of 8 and a mass concentration of 16%, ultrasonicated for 15 h, filtered, and the resulting filter residue was washed with water and then vacuum-dried at 62 °C for 20 h ;

[0056] 3) The composite carbon material treated in step 2) was a...

Embodiment 3

[0067] 1. Preparation of modified composite carbon nanomaterials:

[0068] 1) Put 62 stainless steel balls with a diameter of 5 mm and 46 stainless steel balls with a diameter of 10 mm in two identical 6 L nylon ball mill jars, and then add 1.4 kg of natural single crystal graphite powder and multi-wall The composite carbon material composed of carbon nanotubes at a mass ratio of 1.5:1 was added dropwise with 120 mL of absolute ethanol, sealed with a nylon cover, and two ball mill jars were symmetrically placed in the ball mill. 60 hours of ball milling under the condition of automatically changing the direction of rotation;

[0069] 2) The composite carbon material treated in step 1) was added to an aqueous solution of Tween 40 with a pH value of 8 and a mass concentration of 16%, ultrasonicated for 15 h, filtered, and the resulting filter residue was washed with water and dried in vacuum at 61 °C for 20 h ;

[0070] 3) The composite carbon material treated in step 2) was a...

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Abstract

The invention discloses an additive for toughening concrete and a preparation method thereof. The additive comprises the following raw materials in parts by weight: 1-2 parts of a modified composite carbon nano-material, 35-40 parts of wood powder with activating treatment, 18-23 parts of isotactic polypropylene, 100-150 parts of water, 2.5-3.5 parts of a coupling agent, 3-5 parts of a filling material, and 2.2-3.2 parts of a compatilizer. The modified composite carbon nano-material, the wood powder with activating treatment and the isotactic polypropylene are combined, and a unique composite system is formed by a surface modification effect of the coupling agent and the compatilizer; the prepared additive can be fully dispersed in concrete, the synergistic toughening effect of the material is effectively performed, so that the prepared concrete has the advantages of good toughness, fatigue resistance and isotropy; and the additive is a high performance adding material for toughening concrete.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to an additive for concrete toughening and a preparation method thereof. Background technique [0002] Ordinary concrete has low flexural strength and high brittleness, especially in buildings such as subway tunnel arch walls and cross-sea and river bridges. The structural stress environment is complex, and ordinary concrete is prone to cracks or even breaks during use, which seriously affects the service life of the building. and safe. In order to improve the toughness of concrete, it is urgent to develop concrete additives with toughening properties. Contents of the invention [0003] The object of the present invention is to provide an additive for concrete toughening and a preparation method thereof, the additive can be fully dispersed in concrete, effectively exert the synergistic toughening effect of materials, and make the prepared concrete have good toughnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C04B20/02C04B14/02
CPCC04B20/026C04B40/0042C04B14/026C04B14/024C04B16/02C04B24/42C04B14/28C04B24/2664C04B20/023
Inventor 肖三霞蒋国平
Owner 云南泺决建材有限公司
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