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Composite portland cement and preparation method thereof

A technology of compounding silicate and cement, which is applied in the field of cement to achieve the effect of improving strength and reducing cost

Inactive Publication Date: 2010-09-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Industrial waste residues such as fly ash are widely used in concrete, cement and other fields as mixed materials, but in recent years, industrial waste residues such as fly ash have been in short supply and cannot meet the demand

Method used

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  • Composite portland cement and preparation method thereof
  • Composite portland cement and preparation method thereof
  • Composite portland cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Phosphogypsum modification: Mix phosphogypsum, lime and fly ash in a mass ratio of 12:5:1, bake at 80±5°C for 2 hours, and grind with a ball mill until the specific surface area is 3000-3500cm 2 / g.

[0037] The chemical analysis and particle size distribution of modified phosphogypsum are shown in Table 1 and Table 2, respectively.

[0038] 2. Preparation of construction waste micropowder: After crushing, sieving, and secondary crushing of the waste concrete, the mortar micropowder is separated, and the mortar micropowder and the waste sintered brick micropowder are mixed according to the mass ratio of 2:1 for grinding. Its specific surface area is 3000~3500cm 2 / g.

[0039] 3. Preparation of activator: CaSO 4 with Na 2 SiO 3 9H 2 O was mixed evenly in a mass ratio of 1:3.

[0040] 4. Preparation of mineral admixture: Grinding the slag of the power plant so that the specific surface area is 3500-4000cm 2 / g.

[0041] 5. According to the mass percentage of e...

Embodiment 2

[0045] 1. Phosphogypsum modification: Mix phosphogypsum, lime and fly ash in a mass ratio of 10:4:1, bake at 80±5°C for 2 hours, and grind with a ball mill until the specific surface area is 3000-3500cm 2 / g.

[0046] 2. Preparation of construction waste micropowder: After crushing, sieving, and secondary crushing of waste concrete, the mortar micropowder is separated, and the mortar micropowder and the waste fired brick micropowder are mixed according to the mass ratio of 3:1 for grinding. Its specific surface area is 3000~3500cm 2 / g.

[0047] 3. Preparation of activator: CaSO 4 with Na 2 SiO 3 9H 2 O was mixed evenly in a mass ratio of 1:2.

[0048] 4. Preparation of mineral admixture: Grinding the slag of the power plant so that the specific surface area is 3000-3500cm 2 / g.

[0049] 5. According to the mass percentage of each raw material: 45% of cement clinker, 10% of lead-zinc tailings, 4% of modified phosphogypsum, 25% of construction waste micropowder, 6% of a...

Embodiment 3

[0051] 1. Phosphogypsum modification: Mix phosphogypsum, lime and fly ash according to the mass ratio: 8:3:1, bake at 80±5°C for 2 hours, and use a ball mill to grind until the specific surface area is 3000-3500cm 2 / g.

[0052] 2. Preparation of construction waste powder: After crushing, sieving and secondary crushing of waste concrete, the mortar powder is separated, and the mortar powder and the waste fired brick powder are mixed according to the mass ratio of 4:1 for grinding. Make its specific surface area 3000~3500cm 2 / g.

[0053] 3. Preparation of activator: CaSO 4 with Na 2 SiO 3 9H 2 O was mixed evenly in a mass ratio of 1:4.

[0054] 4. Preparation of mineral admixture: grind the slag from the power plant to make the specific surface area 4000cm 2 / g.

[0055] 5. According to the mass percentage of each raw material: 50% of cement clinker, 20% of construction waste powder, 10% of mineral admixture, 3% of modified phosphogypsum, 10% of lead-zinc tailings, and...

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Abstract

The invention relates to composite portland cement, which mainly comprises the following raw materials by weight percent: 20% to 30% of construction waste micropowder, 15% to 25% of lead and zinc mine tailings, 10% to 15% of mineral admixture, 3% to 5% of modified phosphogypsum and 40% to 50% of cement clinker. The preparation method of the composite portland cement comprises the preparation of modified phosphogypsum, the preparation of construction waste micropowder, the preparation of activator, the preparation of mineral admixture and the preparation of final products. The invention has great significance for the efficient use, energy saving and environment protection of construction waste and industrial waste, and the composite portland cement has the advantages of low cost and higherstrength.

Description

technical field [0001] The invention relates to the field of cement, in particular to a composite Portland cement and a preparation method thereof. Background technique [0002] Construction waste is solid waste generated in municipal engineering, mainly including waste concrete and waste sintered bricks. After crushing, screening, and secondary crushing, construction waste can be used as recycled aggregate and recycled aggregate to prepare recycled concrete and recycled blocks. In the construction waste powder, about 30% of the cement is not hydrated and contains active SiO 2 and Al 2 o 3 , the construction waste powder and CaSO 4 、Na 2 SiO 3 9H 2 O and other activators mixed, can significantly improve its activity, can be used as admixture to prepare composite Portland cement. Phosphogypsum is obtained in the process of phosphate fertilizer production in the form of CaSO 4 2H 2 O is a by-product of the main component, and about 5 tons of phosphogypsum can be obta...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B22/14
CPCC04B2103/0025C04B7/246C04B7/1535Y02P40/10Y02P40/121C04B7/364C04B7/38C04B7/527
Inventor 马保国苏雷蹇守卫宋雪峰徐如林高立
Owner WUHAN UNIV OF TECH
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