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Anti-crack alkalis excited ecological cement

An alkali-activated cement and cement technology, applied in cement production, etc., can solve problems such as poor crack resistance, achieve good crack resistance, good freeze-thaw resistance, low energy consumption and carbon dioxide emissions

Inactive Publication Date: 2009-06-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an anti-cracking type alkali-activated ecological cement for the defects of poor crack resistance of ordinary alkali-activated cement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The mass ratio of the anti-cracking alkali-activated cement is A:B:C=7.5:83:9.5. Among them, A is water glass with a modulus of 1; B is composed of fly ash and slag in a mass ratio of 40:60, with a specific surface area of ​​380m 2 / g; C is the calcination temperature of 750°C to produce activated magnesium oxide, and the water-cement ratio of the standard mortar is 0.34.

[0021] The 3-day flexural strength of the crack-resistant alkali-activated cement mortar obtained in this example is 5.06MPa, and the compressive strength is 22.7MPa; the 7-day flexural strength is 6.35MPa, and the compressive strength is 33.1MPa; the 28-day flexural strength It is 7.78MPa, and the compressive strength is 46.2MPa. Shrinkage rate of mortar: 0.00188% for 1 day, 0.00477% for 3 days, 0.00817% for 7 days, 0.00863% for 14 days, 0.00895% for 21 days, and 0.00915% for 28 days.

Embodiment 2

[0023] The mass ratio of the anti-cracking alkali-activated cement is A:B:C=9.5:83:9.5. Among them, A is water glass with a modulus of 1.2; B is composed of fly ash and slag at a mass ratio of 40:60, with a specific surface area of ​​680m 2 / g; C is the calcination temperature of 800°C to produce activated magnesium oxide, and the water-cement ratio of the standard mortar is 0.37.

[0024] The 3-day flexural strength of the crack-resistant alkali-activated cement mortar obtained in this example is 9.24MPa, and the compressive strength is 41.2MPa; the 7-day flexural strength is 12.12MPa, and the compressive strength is 63.2MPa; the 28-day flexural strength It is 14.33MPa, and the compressive strength is 84.6MPa. Shrinkage rate of mortar: 0.00201% for 1 day, 0.00493% for 3 days, 0.00921% for 7 days, 0.00863% for 14 days, 0.008947% for 21 days, and 0.009151% for 28 days.

Embodiment 3

[0026] The mass ratio of anti-cracking alkali activated cement is A:B:C=5:80:15. Where A is water glass with a modulus of 0.8 plus 20% Na 2 SO 4 Composition; B is composed of coal gangue and slag at a mass ratio of 60:40, with a specific surface area of ​​450m 2 / g; C is the calcination temperature of 800 ° C to produce activated magnesium oxide, the water-cement ratio of the standard mortar is 0.36.

[0027] The 3-day flexural strength of the crack-resistant alkali-activated cement obtained in this example is 4.46MPa, and the compressive strength is 19.1MPa; the 7-day flexural strength is 6.20MPa, and the compressive strength is 30.8MPa; the 28-day flexural strength is 7.39 MPa, the compressive strength is 50.2MPa. Shrinkage rate of mortar: 0.00201% for 1 day, 0.00504% for 3 days, 0.00932% for 7 days, 0.00874% for 14 days, 0.00912% for 21 days, and 0.00931% for 28 days.

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Abstract

The invention relates to anti-cracking alkali exciting ecological cement, which consists of A, B and C, and solid-phase mass ratio of the A to the B to the C is 5-10:75-90:5-15. The A is exciting agent, which comprises the following components by mass percentage: more than or equal to 80 percent of water glass of which modulus is 0.7 to 1.4, and less than or equal to 20 percent of one or a plurality of sodium sulfate, sodium phosphate, sodium carbonate, sodium chloride and magnesium chloride; and the A is prepared into solution containing more than or equal to 40 percent of solid for use. The B is a mineral additive, which comprises the following components by mass percentage: 30 to 70 percent of slag powder, and 30 to 70 percent of other additives, wherein the other additives comprise one or a plurality of siliceous dust, coal ash, metakaolin, red mud, burnt shale, colliery waste, steel slag and alloy slag, and is grinded to powder of which specific surface is 350 to 800m<2> / g. The C is active magnesium oxide, wherein mass content of MgO is more than or equal to 70 percent. The active magnesium oxide is calcined at a temperature of between 700 and 1,000 DEG C and then mixed and grinded with the B to become powder. The cement is the low-carbon discharge ecological cement with the advantages of high-early strength, durability, permeability resistance, corrosion resistance, freezing and thawing resistance, low heat of hydration, good cracking resistance, economy and environmental protection, and is used for civil construction, water conservancy, national defense, and oil well and mine passage support engineering.

Description

technical field [0001] The invention relates to a formula and a preparation method of an alkali-activated ecological cement with good crack resistance. Background technique [0002] In 1957, Glukhovsky (ВДГлуховский) of Kyiv University of Architecture and Technology in Ukraine invented alkali-activated cement, which is a series of gelling prepared by activating slag powder with high concentrations of alkali or alkali metal silicates and carbonates. Materials are currently used in many fields. Alkali-activated slag cement has many excellent properties that Portland cement does not have, such as early strength and high strength, continuous strength growth, low water demand, high impermeability, low heat of hydration, high freeze-thaw resistance, strong rib protection, and energy saving. , low carbon emissions and extensive use of waste residues, but this cement also has many disadvantages: such as too fast setting time, efflorescence, pulverization, excessive strength variatio...

Claims

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Application Information

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IPC IPC(8): C04B7/14
CPCC04B7/1535Y02P40/10
Inventor 沈卫国周明凯王义恒张涛
Owner WUHAN UNIV OF TECH
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