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Preparation method of carbonized steel slag lightweight aggregate and concrete containing carbonized steel slag lightweight aggregate

A technology of lightweight aggregate and carbonized steel, which is applied in the field of concrete containing carbonized steel slag lightweight aggregate, and the field of preparation of carbonized steel slag lightweight aggregate, which can solve the problem of long maintenance time of uncarbonized artificial aggregate, failure to achieve low-carbon environmental protection, and large Cement content and other issues to achieve the effect of enhancing internal curing ability, reducing the risk of cracking, and increasing fluidity

Active Publication Date: 2021-03-16
SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this technology, the curing time of uncarbonized artificial aggregate is too long, which prolongs the production time, and requires pressure for carbonization, which requires high equipment. Cement content, did not achieve the purpose of low-carbon environmental protection

Method used

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  • Preparation method of carbonized steel slag lightweight aggregate and concrete containing carbonized steel slag lightweight aggregate
  • Preparation method of carbonized steel slag lightweight aggregate and concrete containing carbonized steel slag lightweight aggregate
  • Preparation method of carbonized steel slag lightweight aggregate and concrete containing carbonized steel slag lightweight aggregate

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preparation example Construction

[0027] The invention provides a method for preparing carbonized steel slag lightweight aggregate, which comprises the following steps:

[0028] Step 1. Weighing 40-60 parts by mass of steel slag powder, 30-50 parts by mass of vitrified microspheres and 10-30 parts by mass of quicklime are put into a tray and mixed to form a uniform mixed powder;

[0029] Step 2: Spray water droplets evenly on the surface of the mixed powder according to a certain water-cement ratio, and shake the oscillating tray continuously. The powder and water are mixed to form small balls, and the particle size is continuously increased to obtain steel slag with a particle size range of 5-20mm. lightweight aggregate;

[0030] Step 3. Place the steel slag lightweight aggregate in a curing room with a temperature of 20±1°C and a relative humidity of 55±5% for 48 hours;

[0031] Step 4. Put the cured steel slag light aggregate into the temperature of 20±1℃, relative humidity of 70±5%, CO 2 The carbonized s...

Embodiment 1

[0035] The present embodiment provides a method for preparing carbonized steel slag lightweight aggregate, said method comprising the following steps: weighing 40 parts by mass of steel slag powder, 40 parts by mass of vitrified microspheres and 20 parts by mass of quicklime by 0.30% of water ash After mixing into balls, place the obtained steel slag light aggregate in a curing room with a temperature of 20±1°C and a relative humidity of 55±5% for 48 hours. Then put the cured lightweight aggregate at a temperature of 20±1°C, a relative humidity of 70±5%, and CO 2 Carbonize in a carbonization box with a concentration of 80% for 24 hours to obtain carbonized steel slag light aggregate, which is denoted as A1.

Embodiment 2

[0037]The present embodiment provides a method for preparing carbonized steel slag lightweight aggregate, said method comprising the following steps: weighing 50 parts by mass of steel slag powder, 40 parts by mass of vitrified microspheres and 10 parts by mass of quicklime with 0.30 of water ash After mixing into balls, place the obtained steel slag light aggregate in a curing room with a temperature of 20±1°C and a relative humidity of 55±5% for 48 hours. Then put the cured lightweight aggregate at a temperature of 20±1°C, a relative humidity of 70±5%, and CO 2 Carbonize in a carbonization box with a concentration of 80% for 24 hours to obtain carbonized steel slag light aggregate, which is denoted as A2.

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Abstract

The invention discloses a preparation method of carbonized steel slag lightweight aggregate and concrete containing the carbonized steel slag lightweight aggregate. The preparation method of the carbonized steel slag lightweight aggregate comprises the following steps: step 1, weighing 40-60 parts by mass of steel slag powder, 30-50 parts by mass of vitrified micro bubbles and 10-30 parts by massof quick lime, putting into a tray, and performing mixing to form uniform mixed powder; step 2, uniformly spraying water drops to the surface of the mixed powder according to a certain water-cement ratio, continuously shaking the oscillation tray, and mixing the powder with water to form small balls, so as to obtain steel slag lightweight aggregate; 3, placing the steel slag lightweight aggregatein a curing chamber with the temperature being 20 + / -1 DEG C and the relative humidity being 55 + / -5% to be cured for 48 h; and step 4, putting the cured steel slag lightweight aggregate into a carbonization box to be carbonized for 24 hours. The invention has the advantages of simple preparation process, light weight and high strength of aggregate, low cost, low-carbon and environment-friendly production and the like. When applied to concrete, the carbonized steel slag lightweight aggregate can provide internal curing, promote hydration of a cementing material and reduce shrinkage cracking ofthe concrete.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of industrial waste slag, in particular to a method for preparing carbonized steel slag light aggregate and concrete containing the carbonized steel slag light aggregate. Background technique [0002] Steel slag is a typical metallurgical by-product produced in the steel refining process, which contains a large amount of CaO, SiO 2 and a small amount of Al 2 o 3 and MgO. It is estimated that the global production of steel slag in 2020 is about 190 million to 290 million tons. In China, the annual discharge of steel slag exceeds 100 million tons, while the utilization rate is less than 30%. Due to relatively poor hydration activity, potential volume instability, and low grindability issues, most steel slags are underutilized, so exploring more application avenues that can consume large amounts of steel slag is crucial for the recycling of steel slag. Due to the huge demand in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/06C04B28/04C04B38/08C04B40/02C04B111/40
CPCC04B40/0046C04B28/04C04B40/0281C04B40/0236C04B38/08C04B2111/40C04B22/064C04B18/142C04B14/24C04B18/141C04B18/08C04B14/06C04B2103/302
Inventor 苟鸿翔朱敏涛吕恩铝高双双
Owner SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD
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