Modified slag compound admixture and preparation method thereof

Abstract

The invention belongs to the technical fields of resource utilization of solid wastes, environmental protection and energy conservation, and discloses a modified slag compound admixture and a preparation method thereof. The slag compound admixture disclosed by the invention is prepared from the following components in percentage by mass: 60-80% of slag powder, 15-30% of steelmaking slag powder, and 5-10% of white slag. The preparation method disclosed by the invention comprises the step of 60-80% of stirring slag powder, 15-30% of steelmaking slag powder and 5-10% of white slag for 3-5 min. The modified slag compound admixture disclosed by the invention has the most outstanding advantages that the disadvantage of being low in early strength of the compound admixture caused by doping a lot of steelmaking slag is overcome; furthermore, both the activity indexes for 7 days and 28 days are higher than the requirements of GB / T 18046-2008 on S95-level mineral powder; particularly, the activity index for 28 days is greatly increased; the long-period strength still can be increased continuously.

Description

technical field

[0001] The invention belongs to the technical field of resource utilization of solid waste and environmental protection and energy saving, and relates to a modified slag composite admixture and a preparation method thereof. Background technique

[0002] In recent years, with the vigorous development of commercial concrete in my country and the development and deepening of cement concrete research and application technology, mineral admixtures have become one of the indispensable and important components of modern concrete. Slag and fly ash among the three major industrial wastes have been widely and maturely used in the cement concrete industry, but steel slag, one of the three major industrial wastes, has not yet been utilized as a resource with high added value. It is China's established national policy to develop a circular economy and take the road of sustainable development, and the resource utilization of industrial waste residue is one of the key links...

Examples

Embodiment 1

[0026] The mass percentage of S95 grade slag powder is 60%, and the density is 2.90g / cm 3 , specific surface area 415m 2 / kg; 7-day activity index ≥ 75%, 28-day activity index ≥ 95%, sulfur trioxide content ≤ 4.0%, chloride ion content ≤ 0.06%.

[0027] The mass percentage of ground converter steel slag powder is 30%, and the density is 3.90g / cm 3 , specific surface area 405m 2 / kg, 28-day activity index ≥ 75%, sulfur trioxide content ≤ 4.0%, chloride ion content ≤ 0.05%, alkalinity ≥ 2.2.

[0028] The mass percentage of white slag is 10%, and the specific surface area is 420m 2 / kg.

[0029] Add 60% slag powder by mass, 30% steel slag powder and 10% white slag into the mixer and stir for 5 minutes to prepare the modified slag composite admixture . Refer to GB / T 18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete" to test the performance of the modified slag composite admixture sample in all aspects. The benchmark cement is Conch brand 42.5 Port...

Embodiment 2

[0031]The mass percentage of S95 grade slag powder is 68%, and the density is 2.90g / cm 3 , specific surface area 415m 2 / kg, 7-day activity index ≥ 75%, 28-day activity index ≥ 95%, sulfur trioxide content ≤ 4.0%, chloride ion content ≤ 0.06%.

[0032] The mass percentage of ground converter steel slag powder is 25%, and the density is 3.90g / cm 3 , specific surface area 405m 2 / kg, 28-day activity index ≥ 75%, sulfur trioxide content ≤ 4.0%, chloride ion content ≤ 0.05%, alkalinity ≥ 2.2.

[0033] The mass percentage of white slag is 7%, and the specific surface area is 420m 2 / kg.

[0034] Add 68% slag powder by mass, 25% steel slag powder and 7% white slag into the mixer, and stir for 4 minutes to prepare the modified slag composite admixture . Refer to GB / T 18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete" to test the performance of the modified slag composite admixture sample in all aspects. The benchmark cement is Conch brand 42.5 Portla...

Embodiment 3

[0036] The mass percentage of S95 grade slag powder is 80%, and the density is 2.90g / cm 3 , specific surface area 415m 2 / kg, 7-day activity index ≥ 75%, 28-day activity index ≥ 95%, sulfur trioxide content ≤ 4.0%, chloride ion content ≤ 0.06%.

[0037] The mass percentage of ground electric furnace steel slag powder is 15%, and the density is 3.90g / cm 3 , specific surface area 405m 2 / kg; 28-day activity index ≥ 75%, sulfur trioxide content ≤ 4.0%, chloride ion content ≤ 0.05%, alkalinity ≥ 2.2.

[0038] The mass percentage of white slag is 5%, and the specific surface area is 420m 2 / kg.

[0039] Add 80% slag powder by mass, 15% steel slag powder and 5% white slag into the mixer, and stir for 3 minutes to prepare the modified slag composite admixture . Refer to GB / T18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete" to test the performance of the modified slag composite admixture sample in all aspects. The benchmark cement is Conch brand 42.5...

technical field

[0001] The invention belongs to the technical field of resource utilization of solid waste and environmental protection and energy saving, and relates to a modified slag composite admixture and a preparation method thereof. Background technique

[0002] In recent years, with the vigorous development of commercial concrete in my country and the development and deepening of cement concrete research and application technology, mineral admixtures have become one of the indispensable and important components of modern concrete. Slag and fly ash among the three major industrial wastes have been widely and maturely used in the cement concrete industry, but steel slag, one of the three major industrial wastes, has not yet been utilized as a resource with high added value. It is China's established national policy to develop a circular economy and take the road of sustainable development, and the resource utilization of industrial waste residue is one of the key links...

Examples

Embodiment 1

[0026] The mass percentage of S95 grade slag powder is 60%, and the density is 2.90g / cm 3 , specific surface area 415m 2 / kg; 7-day activity index ≥ 75%, 28-day activity index ≥ 95%, sulfur trioxide content ≤ 4.0%, chloride ion content ≤ 0.06%.

[0027] The mass percentage of ground converter steel slag powder is 30%, and the density is 3.90g / cm 3 , specific surface area 405m 2 / kg, 28-day activity index ≥ 75%, sulfur trioxide content ≤ 4.0%, chloride ion content ≤ 0.05%, alkalinity ≥ 2.2.

[0028] The mass percentage of white slag is 10%, and the specific surface area is 420m 2 / kg.

[0029] Add 60% slag powder by mass, 30% steel slag powder and 10% white slag into the mixer and stir for 5 minutes to prepare the modified slag composite admixture . Refer to GB / T 18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete" to test the performance of the modified slag composite admixture sample in all aspects. The benchmark cement is Conch brand 42.5 Port...

Embodiment 2

[0031]The mass percentage of S95 grade slag powder is 68%, and the density is 2.90g / cm 3 , specific surface area 415m 2 / kg, 7-day activity index ≥ 75%, 28-day activity index ≥ 95%, sulfur trioxide content ≤ 4.0%, chloride ion content ≤ 0.06%.

[0032] The mass percentage of ground converter steel slag powder is 25%, and the density is 3.90g / cm 3 , specific surface area 405m 2 / kg, 28-day activity index ≥ 75%, sulfur trioxide content ≤ 4.0%, chloride ion content ≤ 0.05%, alkalinity ≥ 2.2.

[0033] The mass percentage of white slag is 7%, and the specific surface area is 420m 2 / kg.

[0034] Add 68% slag powder by mass, 25% steel slag powder and 7% white slag into the mixer, and stir for 4 minutes to prepare the modified slag composite admixture . Refer to GB / T 18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete" to test the performance of the modified slag composite admixture sample in all aspects. The benchmark cement is Conch brand 42.5 Portla...

Embodiment 3

[0036] The mass percentage of S95 grade slag powder is 80%, and the density is 2.90g / cm 3 , specific surface area 415m 2 / kg, 7-day activity index ≥ 75%, 28-day activity index ≥ 95%, sulfur trioxide content ≤ 4.0%, chloride ion content ≤ 0.06%.

[0037] The mass percentage of ground electric furnace steel slag powder is 15%, and the density is 3.90g / cm 3 , specific surface area 405m 2 / kg; 28-day activity index ≥ 75%, sulfur trioxide content ≤ 4.0%, chloride ion content ≤ 0.05%, alkalinity ≥ 2.2.

[0038] The mass percentage of white slag is 5%, and the specific surface area is 420m 2 / kg.

[0039] Add 80% slag powder by mass, 15% steel slag powder and 5% white slag into the mixer, and stir for 3 minutes to prepare the modified slag composite admixture . Refer to GB / T18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete" to test the performance of the modified slag composite admixture sample in all aspects. The benchmark cement is Conch brand 42.5...

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