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Preparation method of modified S95-grade slag powder

A slag powder and modification technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problem of unseen technical reports on hemihydrate gypsum, unseen 3-day activity index of composite steel slag powder, etc. problem, to achieve the effect of improving durability performance, reducing drying and early shrinkage cracking

Active Publication Date: 2012-05-02
SHANGHAI HAILI NEW ENVIRONMENTAL PROTECTION BUILDING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 3. DG / TJ08-2013-2007 "Technical Regulations for the Application of Steel Slag Powder Concrete" approved and promulgated by the Shanghai Construction and Transportation Commission, in which the composite steel slag powder is prepared by compounding mineral admixtures such as slag powder, steel slag powder, and silica fume Formed, its specific surface area ≥ 360m 2 / kg, the 7-day and 28-day strength activity indexes of the first-grade composite steel slag powder are only greater than or equal to 75% and 90%, and there is no 3-day activity index that can show the early strength index of the composite steel slag powder
[0005] 4. There is no relevant technical report on adding hemihydrate gypsum as an activator or modifier to steel slag and slag powder

Method used

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  • Preparation method of modified S95-grade slag powder
  • Preparation method of modified S95-grade slag powder
  • Preparation method of modified S95-grade slag powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment one: take prepared sample 100g as 100% meter:

[0026] A. Take ultra-fine steel slag powder 27%; density 2.90g / cm 3 , specific surface area 620m 2 / kg;

[0027] B. Take 70% of S95 slag powder from a Shanghai New Building Materials Co., Ltd., with a density of 2.88g / cm 3 , specific surface area 443m 2 / kg;

[0028] C. Take 3% of hemihydrate desulfurized gypsum from a power plant in Zhejiang, SO 3 The content is 53%, and the content of hemihydrate gypsum is 96%.

[0029] After the above three components are uniformly mixed, it becomes the S95 grade modified slag powder sample. According to the national standard GB / T18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete", the strength of S95 grade modified slag powder sample was tested. Conch brand 52.5 Portland cement is selected as the benchmark cement. The test results are shown in Table 1.

[0030] Table 1: Test results of strength and activity index of S95 grade modified slag ...

Embodiment 2

[0032] Embodiment two: take prepared sample 100g as 100% meter:

[0033] A. Take 20% ultra-fine steel slag powder, density 2.90g / cm 3 , specific surface area 620m 2 / kg;

[0034] B. Take 75% of S95 grade slag powder from a building materials Co., Ltd. in Zhangjiagang, with a density of 2.85g / cm 3 , specific surface area 467m 2 / kg;

[0035] C. Take 5% of hemihydrate gypsum from a power plant in Zhejiang, SO 3 The content is 53%, and the content of hemihydrate gypsum is 96%.

[0036] After the above three components are uniformly mixed, it becomes S95 grade modified slag powder. According to the national standard GB / T180462008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete", the strength of S95 grade modified slag powder sample was tested. The benchmark cement is Conch 42.5 grade ordinary Portland cement. The test results are shown in Table 2.

[0037] Table 2: Test results of strength and activity index of S95 grade modified slag powder

[0038] ...

Embodiment 3

[0039] Embodiment three: take prepared sample 100g as 100% meter:

[0040] A. Take ultra-fine steel slag powder 10%; density 2.90g / cm 3 , specific surface area 620m 2 / kg;

[0041] B. Take 85% of S95 grade slag powder from a building materials Co., Ltd. in Zhangjiagang, with a density of 2.85g / cm 3 , specific surface area 467m 2 / kg;

[0042] C. Take 5% of hemihydrate gypsum from a power plant in Zhejiang, SO 3 The content is 53%, and the content of hemihydrate gypsum is 96%.

[0043] After the above three components are uniformly mixed, it becomes S95 grade modified slag powder. According to the national standard GB / T18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete", the strength of S95 grade modified slag powder sample was tested. The benchmark cement is Conch brand 42.5 ordinary Portland cement. The test results are shown in Table 3.

[0044] Table 3: Test results of strength and activity index of S95 grade modified slag powder

[0045]...

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Abstract

The invention relates to a preparation method of modified S95-grade slag powder, belonging to the technical field of building materials. The modified S95-grade slag powder comprises the following raw materials in percentage by weight: 50%-85% of S95-grade slag powder, 10%-40% of superfine slag micropowder and 3%-15% of semi-hydrated gypsum. The modified S95-grade slag micropowder has a three-day activity index between 70% and 80%, a seven-day activity index between 85% and 90% and a twenty-eight-day activity index between 100% and 115%. The invention not only overcomes the shortage of low three-day early strength of the S95-grade slag powder, but also can obviously reduce the drying of concrete and decrease early contraction cracks of the concrete when applied to premixed concrete and also can effectively enhance the durability performance of the concrete.

Description

technical field [0001] The invention relates to a preparation method of modified S95 grade slag powder, which belongs to the technical field of building materials. Background technique [0002] 1. The main performance indicators of steel slag powder so far: the activity index of 7-day and 28-day strength is only greater than or equal to 75% and 80%, and there is no 3-day activity index that can show the early strength index of steel slag powder. The GB / T 20491-2006 standard "Steel Slag Powder Used in Cement and Concrete" issued by the country has an activity index of only 65% ​​and 80% at 7 days and 28 days. [0003] 2. According to the GB / T 18046-2008 standard "Granulated Blast Furnace Slag Powder Used in Cement and Concrete", the specific surface area of ​​S95 grade slag powder is ≥400m 2 / kg, the 7-day and 28-day activity indices were only greater than or equal to 75% and 95%. [0004] 3. DG / TJ08-2013-2007 "Technical Regulations for the Application of Steel Slag Powder ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/30C04B28/04
CPCC04B11/26C04B28/147Y02W30/91C04B18/141C04B18/142C04B20/0076C04B20/008
Inventor 陆文雄樊钧施钟毅施庆安曹栋樑
Owner SHANGHAI HAILI NEW ENVIRONMENTAL PROTECTION BUILDING MATERIAL CO LTD
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