Preparation method of high-performance carbonized reinforced concrete

A technology for enhancing concrete and high performance, applied in the field of materials, can solve the problems of limited application scope of steel slag products, low mechanical strength of concrete, single means, etc., and achieve the effects of excellent working performance, improved molding method, and huge environmental benefits.

Active Publication Date: 2020-02-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current carbonization forming methods are relatively single, mainly pressing and forming, which limits the application range of steel slag products to a certain extent.
A few processes use steel slag to replace part of the cement to prepare carbonizable concrete materials by pouring molding, but the water-binder ratio is generally high, which seriously restricts CO 2 The diffusion of gas into the product and the progress of carbonation reaction lead to low mechanical strength of concrete

Method used

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  • Preparation method of high-performance carbonized reinforced concrete
  • Preparation method of high-performance carbonized reinforced concrete
  • Preparation method of high-performance carbonized reinforced concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The high-performance carbonation reinforced concrete of the present invention is obtained according to the following process:

[0036]

[0037]

[0038] According to drying time: 28 hours

[0039] Carbonization time: 12 hours;

[0040] Carbonization pressure: 0.3MPa;

[0041] Sand volume fraction: 40%.

[0042] Raw materials are prepared, and the proportions of four different dosages are: hydraulic cementitious material 157.2, 78.6, 33.3, 0g, steel slag 898.5, 1010.8, 1054.8, 1137.6g, carbonized reinforcing phase 67.4, 33.7, 22.2, 0g, quartz sand Both are 1060g. After dry mixing evenly, add 175.2, 175.2, 176.7, 177.5g of water and 44.9, 44.9, 45.3, 45.5g of water reducing agent to mix, stir evenly, pour into the mold for molding; then Sealed and cured for 24 hours, placed in a drying oven to dry for 28 hours after demoulding; maintained for 12 hours in a carbonization curing room at 20°C, with a relative humidity of 85%, a carbon dioxide concentration of 95%, a...

Embodiment 2

[0045] The high-performance carbonation reinforced concrete of the present invention is obtained according to the following process:

[0046]

[0047] According to the amount of steel slag: 90%;

[0048] Drying time: 27 hours;

[0049] Carbonization time: 12 hours;

[0050] Carbonization pressure: 0.3MPa.

[0051]Prepare raw materials, prepare mortar samples according to the content of each component in the above table, stir evenly, pour into the mold for molding; then seal and maintain for 24 hours, and place it in a drying oven to dry for 27 hours after demoulding;; at 20 ° C, relative humidity 80%, carbon dioxide concentration 99.8%, air pressure 0.4MPa (0.3MPa higher than the external atmospheric pressure) carbonization curing room curing for 12 hours, to obtain composite reinforced carbonized products. After testing, the performance parameters of steel slag products with different aggregate volume fractions are shown in the table below.

[0052] aggregate...

Embodiment 3

[0054] The high-performance carbonation reinforced concrete of the present invention is obtained according to the following process:

[0055]

[0056] According to the amount of steel slag: 80%;

[0057] Drying time: 11 hours;

[0058] Carbonization time: 12 hours;

[0059] Carbonization pressure: 0.1, 0.2, 0.3, 0.4MPa.

[0060] Prepare raw materials, prepare mortar samples according to the content of each component in the above table, stir evenly, pour into the mold for molding; then seal and maintain for 24 hours, and place it in a drying oven to dry for 11 hours after demoulding; at 20°C, relative humidity 60 %, with a carbon dioxide concentration of 99.8%, respectively curing in carbonization curing rooms with air pressures of 0.1, 0.2, 0.3, and 0.4 MPa for 12 hours to obtain composite reinforced carbonized products. After testing, the performance parameters of steel slag products under different carbonization pressures are shown in the table below.

[0061] ...

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Abstract

The invention discloses a preparation method of high-performance carbonized reinforced concrete, and the method comprises the following steps: mixing steel slag, a hydraulic cementing material, a carbonized reinforced phase and quartz sand, adding water and a water reducing agent, stirring, and carrying out casting molding on the stirred slurry; sealing and maintaining the molded product for 12-24hours, removing a mold, and carrying out drying pretreatment; and putting the dried product into a carbonization kettle with a CO2 atmosphere and an air pressure of 0.1-0.5 MPa, and carrying out carbonization maintenance for 12-24 hours to obtain a steel slag product. The high-performance carbonized reinforced concrete prepared by the invention has excellent working performance; the hydrated andcarbonized synergistic effect of the hydraulic cementing material and the steel slag is fully utilized, the compressive strength can reach 100 MPa within a short time, meanwhile, the utilization rateof the steel slag is remarkably increased, a large amount of CO2 can be solidified and stored, huge environmental benefits are achieved, development of green building materials is facilitated, and a sustainable development road is achieved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of high-performance carbonized reinforced concrete. Background technique [0002] At present, my country's annual steel production accounts for 1 / 5 of the world's steel industry. As waste slag produced in the steelmaking process, the discharge of steel slag is about 15% of steel production. The annual discharge of steel slag in my country is as high as 100 million tons, but the utilization rate of steel slag is Low, the comprehensive utilization rate is only 20%. Compared with the effective utilization rate of 65% in Europe and the utilization status of the United States, which is basically balanced between emission and utilization, a large amount of steel slag is piled up in my country, occupying cultivated land, and causing serious water pollution and environmental pollution. Therefore, it is imminent to improve the utilization rate of steel s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06B28B11/24
CPCB28B11/245C04B28/04C04B28/06C04B2111/00017C04B2201/50C04B18/142C04B14/06C04B2103/302C04B24/32C04B24/2623C04B24/38C04B22/00
Inventor 刘志超曾海马王发洲张秀贞何永佳
Owner WUHAN UNIV OF TECH
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