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Additive for toughening concrete and preparation method thereof

An additive and concrete technology, applied in the field of materials, can solve problems such as high brittleness, fracture, and complex structural stress environment, and achieve the effects of good toughness, simple preparation conditions, and easy raw materials

Active Publication Date: 2016-06-08
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 5mm and 46 stainless steel balls with a diameter of 10mm into two identical 6L nylon ball mill tanks, and then add 1.4kg of high-purity ultrafine graphite powder and multi-walled carbon nanotubes. Composite carbon material with a mass ratio of 1.5:1, then add 120mL of absolute ethanol dropwise, seal it with a nylon cover, put two ball mill jars into the ball mill symmetrically, at a speed of 500rpm, and automatically change the direction of rotation every 30min Lower ball milling treatment for 60h;

[0041] 2) Add the composite carbon material treated in step 1) into Tween40 aqueous solution with a pH value of 8 and a mass concentration of 16%, ultrasonication for 15 hours, and filtration. The obtained filter residue was washed with water and then vacuum-dried at 60°C for 20 hours;

[0042] 3) Add the composite carbon material treated in step 2) into t...

Embodiment 2

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

[0054] 1) Put 62 stainless steel balls with a diameter of 5mm and 46 stainless steel balls with a diameter of 10mm in two identical 6L nylon ball mill tanks, and then add 1.4kg of natural single crystal graphite powder and multi-walled carbon nanotubes respectively According to the composite carbon material with a mass ratio of 1.5:1, 120mL of absolute ethanol was added dropwise, sealed with a nylon cover, and two ball mill jars were symmetrically placed in the ball mill. Under the condition of ball milling for 60h;

[0055] 2) Add the composite carbon material treated in step 1) into Tween40 aqueous solution with a pH value of 8 and a mass concentration of 16%, ultrasonication for 15 hours, and filtration. The resulting filter residue was washed with water and then vacuum-dried at 62°C for 20 hours;

[0056] 3) Add the composite carbon material treated in step 2) into the HCl solution with a concentration of...

Embodiment 3

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

[0068]1) Put 62 stainless steel balls with a diameter of 5mm and 46 stainless steel balls with a diameter of 10mm in two identical 6L nylon ball mill tanks, and then add 1.4kg of natural single crystal graphite powder and multi-walled carbon nanotubes respectively According to the composite carbon material with a mass ratio of 1.5:1, 120mL of absolute ethanol was added dropwise, sealed with a nylon cover, and two ball mill jars were symmetrically placed in the ball mill. Under the condition of ball milling for 60h;

[0069] 2) The composite carbon material treated in step 1) was added to the Tween40 aqueous solution with a pH value of 8 and a mass concentration of 16%, ultrasonicated for 15 hours, filtered, and the resulting filter residue was washed with water and dried in vacuum at 61°C for 20 hours;

[0070] 3) Add the composite carbon material treated in step 2) into a 2M HCl solution, sonicate for 36 hou...

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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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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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