Modified steel slag composite admixture and preparation method thereof

A technology of composite admixture and steel slag, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of low early strength, hardened concrete damage, etc., and achieve improved early activity and easy vibration , the effect of improving work performance

Inactive Publication Date: 2012-06-13
SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Grind fine steel slag powder (specific table ≥ 420m 2 / kg) used to replace cement as an admixture has many advantages above, but the early strength is low, and contains a certain amount of free calcium oxide (f-CaO), which generates Ca(OH) during the hydration process 2 However, volume expansion may cause damage to hardened concrete, thus limiting its popularization and application.

Method used

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  • Modified steel slag composite admixture and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Steel slag powder 25wt%, density 3.55g / cm 3 , specific surface area 420m 2 / kg;

[0024] S95 grade slag powder 74wt%, density 2.90g / cm 3 , specific surface area 430m 2 / kg;

[0025] Sintered desulfurization ash 1wt%.

[0026] The above three components were uniformly mixed by mechanical stirring to make a modified steel slag composite admixture sample. Refer to GB / T18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete" to test the performance of the modified steel slag composite admixture sample in all aspects. The benchmark cement is Conch brand 42.5 Portland cement, and the test results are shown in Table 1.

Embodiment 2

[0028] Steel slag powder 28wt%, density 3.55g / cm 3 , specific surface area 430m 2 / kg;

[0029] S95 grade slag powder 70wt%, density 2.90g / cm 3 , specific surface area 430m 2 / kg;

[0030] Sintered desulfurization ash 2wt%.

[0031] The above three components are uniformly mixed to make a modified steel slag composite admixture sample. Refer to GB / T18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete" to test the properties of the modified steel slag composite admixture sample. The benchmark cement is Conch brand 42.5 Portland cement, and the test results are shown in Table 1.

Embodiment 3

[0033] Steel slag powder 36wt%, density 3.55g / cm 3 , specific surface area 495m 2 / kg;

[0034] S95 grade slag powder 60wt%, density 2.90g / cm 3 , specific surface area 430m 2 / kg;

[0035] Sintered desulfurization ash 4wt%.

[0036] First add sintered desulfurization ash to make modified steel slag powder when grinding steel slag, and then compound it with S95 slag powder at a ratio of 4:6 to make modified steel slag composite admixture. Refer to GB / T18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete" to test the properties of the modified steel slag composite admixture sample. The benchmark cement is Conch brand 42.5 Portland cement, and the test results are shown in Table 1.

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Abstract

The invention discloses a modified steel slag composite admixture and a preparation method thereof. The modified steel slag composite admixture comprises 55-75wt% of micro mineral slag powder, 20-40wt% of micro steel slag powder, and 1-5wt% of sintering desulphurization slag. Concrete prepared by mixing the modified steel slag composite admixture of the invention with cement has the following characteristics: the seven day active index is greater than 75%, the twenty-eight day active index is greater than 100%, the specific surface area is equal to or greater than 400m<2>/kg, the sulfur trioxide content is equal to or less than 4.0%, the chloride ion content is equal to or less than 0.06%, the ignition loss amount is equal to or less than 3.0%, and the autoclaving stability is qualified. The modified steel slag composite admixture which allows a low early strength disadvantage of steel slag composite admixtures to be overcome, working performances of concrete to be effectively improved, the strength and the endurance of concrete to be improved, and energy consumption required by slag grinding to be effectively reduced and is in favor of the low carbon economy realization, is a resource use type concrete admixture.

Description

technical field [0001] The invention belongs to the technical field of new materials, environmental protection and energy saving, and specifically relates to a modified steel slag composite admixture and a preparation method thereof, which provides an effective way for resource utilization of solid waste such as steel slag powder. Background technique [0002] Steel slag is produced in the smelting process of converters, electric furnaces or refining furnaces, which is mainly oxides and sometimes contains a small amount of fluorides, sulfides, etc. 15-20% of the output. In recent years, my country's iron and steel enterprises have developed rapidly, with an average annual increase of crude steel output of 22.4%. In 2010, the steel output has exceeded 600 million tons, and the resulting steel slag has reached nearly 100 million tons. After the steel slag is discharged, it not only occupies land resources, but also causes environmental pollution, endangers human health, and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/30
CPCY02W30/91
Inventor 顾文飞施惠生徐兵康明
Owner SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS
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