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Controllable low-strength concrete containing desulfurization slag and steel slag

A desulfurization slag, low-strength technology that can be used in climate sustainability, sustainable waste treatment, solid waste management, etc., and can solve problems such as comprehensive utilization concerns

Pending Publication Date: 2021-05-28
江苏瑜工环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The domestic application of dry desulfurization slag is still in its infancy, and there are still doubts about its comprehensive utilization

Method used

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  • Controllable low-strength concrete containing desulfurization slag and steel slag
  • Controllable low-strength concrete containing desulfurization slag and steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Desulfurization slag plus steel slag to prepare CLSM (19 / 12 / 24)

[0038] Take each component according to the following weight: desulfurization slag 57, fly ash 10, water-quenched slag powder 14, steel slag 19, and the particle size of steel slag is controlled below 3mm;

[0039] Stir the desulfurization slag, fly ash, water-quenched slag powder and other powder materials first, then add water and mix well, then add steel slag and stir well, the water-powder ratio is 0.41, and the test tube fluidity (tube flow, ASTM D6103-04) is 15.5cm , make a 100*100*100mm test block, and moderately sprinkle water at room temperature for 28 days to get it.

[0040] In the early stage, due to the retarding effect of desulfurization slag, the strength developed slowly. After 28 days, it only reached 4.2MPa, after 90 days it reached 8.9MPa, and after 140 days it reached 12.8MPa. There is no swelling and bursting phenomenon after curing for 180 days at room temperature.

Embodiment 2

[0041] Example 2: Desulfurization slag plus steel slag to prepare CLSM (20 / 5 / 22)

[0042] Take each component according to the following weight: desulfurization slag 35, fly ash 12, water-quenched slag powder 12, steel slag 41;

[0043] Steel slag particle size screened below 0.6mm (standard sieve 30 mesh) is used;

[0044] Stir the desulfurization slag, fly ash, water-quenched slag powder and other powder materials first, then add water and mix well, then add steel slag and stir well, the water-powder ratio is 0.51, and the test tube flow is 16cm (ASTM standard is 15- 20cm), made into a 100*100*100mm test block, moderately watered and cured for 28 days at room temperature, that is. The 28-day strength is 11.6MPa.

[0045] After 14 days of curing, a high-temperature and high-pressure (205°C, 1.8MPa) steam curing test was carried out for 4 hours, and the sample remained intact, with only a few inconspicuous small blasts on the surface.

Embodiment 3

[0046] Example 3: Desulfurization slag plus steel slag tailings to prepare CLSM (20 / 6 / 9)

[0047]Take each component according to the following weight: desulfurization slag 38, fly ash 12, water-quenched slag powder 9, steel slag tailings (1) 41; steel slag tailings with a particle size of 2.36mm (standard sieve 8 mesh) or less are used;

[0048] Stir the desulfurization slag, fly ash, water-quenched slag powder and other powder materials first, then add water and mix well, then add steel slag tailings (1) and stir well, the water-powder ratio is 0.53, and the tube flow is 14.5cm , make a 100*100*100mm test block, and moderately sprinkle water at room temperature for 28 days to get it. The 28-day strength is 5.1Mpa, and the strength can meet the requirements for general roadbeds and building foundation cushions.

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Abstract

The invention discloses controllable low-strength concrete containing desulfurized slag and steel slag, which is composed of the following materials: 20-50% of desulfurized slag, 5-20% of fly ash, 5-30% of water-quenched slag powder, 0-5% of Portland cement, 0-5% of carbide slag, 0-40% of steel slag tailings and 0-30% of iron tailings, and the desulfurized slag is a main solid waste filler and a volcanic ash activity excitation material. The invention relates to the technical field of construction materials, in particular to controllable low-strength concrete containing desulfurization slag and steel slag. The instability influence of calcium sulfite, ettringite and steel slag is reduced, and the stability of building materials using related raw materials is improved. Due to the low-strength characteristic of the CLSM, the plasticity of the CLSM also reduces the possible expansion damage influence in the later period; the alkalinity and the gelling property of the solid waste and dense filling of aggregate gradation are fully utilized, so that the use of materials such as cement and gravel is reduced, and the cost is greatly reduced; a large amount of local industrial and mining solid waste is used as the raw material, so that the solid waste can be recycled, the storage of the solid waste is reduced, and the harm of the solid waste to the environment is reduced.

Description

technical field [0001] The invention relates to the technical field of construction materials, in particular to controllable low-strength concrete containing desulfurization slag and steel slag. Background technique [0002] In the past, wet desulfurization was used for flue gas desulfurization of sintering machines in steel plants. Not only did the equipment occupy a large area, but it also produced desulfurized gypsum solid waste and wastewater, and the operation and maintenance costs were high. In recent years, more and more steel mills have adopted circulating fluidized bed dry or semi-dry desulfurization for flue gas from sintering machines. This method saves equipment investment, occupies a small area, and does not generate waste water. The dry powder absorbent (calcium oxide or calcium hydroxide) reacts with the sulfur in the flue gas to form calcium sulfate. However, due to the incomplete oxidation reaction of desulfurization, most of the desulfurization products exi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/14C04B18/08
CPCC04B28/144C04B18/08C04B18/141C04B18/142Y02W30/91
Inventor 朱天民刘岩
Owner 江苏瑜工环保科技有限公司
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