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High-performance alkali-activated cementing material and preparation method thereof

A cementing material and high-performance technology, applied in the field of cementing materials and high-performance alkali-activated cementing materials, can solve the problem of low hydration activity of carbonated steel slag, achieve good economic value, improve resource utilization, and evenly distribute Effect

Active Publication Date: 2022-05-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the technical problem of low hydration activity of carbonated steel slag in the prior art and difficulty in using it in cementitious materials, the first purpose of the present invention is to propose a high-performance alkali-activated cementitious material, which adopts a single Carbonated steel slag is used as a raw material, and the gelling activity is stimulated by using a special alkali activator to obtain a cementitious material with a fast consolidation rate and high consolidation strength.

Method used

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  • High-performance alkali-activated cementing material and preparation method thereof

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Effect test

Embodiment 1

[0036] Dry the carbonated steel slag and grind it until the particle size is less than 200 mesh, then mix it with a sodium silicate solution with a mode of 1.0 and a liquid-solid ratio of 0.3, pour the uniformly mixed material into a steel mold, and vibrate on an electric vibrating table for 5 minutes , and then sealed and cured at 20°C for 24 hours to demould, and the demoulded product continued to be cured for 28 days, and the compressive strength of the sample was measured to be 53MPa.

Embodiment 2

[0038] Dry the carbonated steel slag and grind it until the particle size is less than 200 mesh, then mix it with a sodium silicate solution with a modulus of 3.0, the liquid-solid ratio is 0.55, pour the uniformly mixed material into a steel mold, and vibrate on an electric vibrating table After 3 minutes, it was sealed and cured at 60°C for 1 hour to demould, and the demoulded product continued to be cured for 28 days, and the compressive strength of the sample was measured to be 47MPa.

Embodiment 3

[0040] Dry the carbonated steel slag and grind it until the particle size is less than 200 mesh, then mix it with a sodium silicate solution with a modulus of 1.0 and a NaOH mixed solution with a concentration of 5mol / L (the content of active silicate ions in the mixed solution is expressed as SiO 2 The measured content is 10%), the liquid-solid ratio is 0.3, and the uniformly mixed material is poured into a steel mold, shaken on an electric vibrating table for 5 minutes, and then sealed and cured at 20°C for 24 hours to demould, and the product after demoulding continues to be cured After 28 days, the compressive strength of the sample was determined to be 62MPa.

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Abstract

The invention discloses a high-performance alkali-activated cementing material and a preparation method thereof, and the cementing material is obtained by mixing and reacting carbonated steel slag and an alkali activator containing an alkali metal silicic acid compound. According to the technical scheme, the carbonated steel slag which is lower in gelatinization activity and poorer in utilization value is adopted as a raw material and is excited by a special alkali activator, a gel material which is better in mechanical property and stability is obtained under the condition that gelatinization active components do not need to be additionally added, efficient utilization of the low-activity carbonated steel slag is achieved, and the service life of the low-activity carbonated steel slag is prolonged. The economic value is relatively high.

Description

technical field [0001] The invention relates to a cementitious material, in particular to a high-performance alkali-activated cementitious material prepared by utilizing carbonated steel slag, and to a preparation method thereof, which belongs to the field of resource recycling. Background technique [0002] Steel slag is a by-product of the steel production process. According to statistics, in 2020, my country's steel production process produced a total of about 150 million tons of steel slag. Although steel slag has a chemical composition similar to cement, due to the high content of free calcium oxide, it is easy to cause problems such as volume expansion and cracking of concrete products, which affects the stability of the product and the safety of the structure. At present, the comprehensive utilization rate of steel slag in my country is low, and it is urgent to develop safe and efficient resource utilization methods for steel slag. [0003] The high content of calciu...

Claims

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Application Information

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IPC IPC(8): C04B7/153C04B28/08
CPCC04B7/1535C04B28/082C04B12/04Y02P40/10
Inventor 孙增青范晓慧刘轻松甘敏陈许玲季志云黄晓贤唐庆余邢金鑫
Owner CENT SOUTH UNIV