Application of nanometer magnesium oxide in cement base material as expanding agent

A technology of nano-magnesia and cement-based materials, which is applied in the application field of nano-magnesia and can solve problems such as poor volume stability

Active Publication Date: 2014-05-28
浙江森立生态环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For light-burned magnesia as an expansion agent and the use of periclase in Portland cement clinker as an expansion source, due to the firing temperature, holding time, cooling method and grinding fineness, etc. will affect the light-burned magnesia and The particle size of (reburned) periclase, if not properly controlled, has the potential to cause poor volume stability
Especially when the periclase particles in the cement clinker are larger than 20-30 microns, when its content reaches more than 1.5%, it may cause poor volume stability

Method used

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  • Application of nanometer magnesium oxide in cement base material as expanding agent
  • Application of nanometer magnesium oxide in cement base material as expanding agent
  • Application of nanometer magnesium oxide in cement base material as expanding agent

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Prepare the cement paste according to the composition of the cement paste in Table 1. Weigh first, then fully dry-mix 52.5-grade ordinary cement and nano-magnesia (provided by Hangzhou Wanjing New Material Co., Ltd., with an average diameter of 50nm, MgO content of 99.90%, and a preparation temperature of 1100-1300°C), and then press the cement Preparation method of clean pulp (GB / T1346-2011) Prepare clean pulp, and mold 3 expansion specimens in a test mold of 25×25×280mm. After curing in a curing box at (20±1)°C for 24 hours, remove the mold and measure its initial length (accurate to 0.001mm). Afterwards, they are all maintained in water at (20±1) °C, and their length is measured during the specified curing time, and the linear expansion rate is finally calculated. And on the basis of curing in 20°C water for 365d, then autoclave curing in an autoclave (216°C and 2.0MPa saturated water vapor) for 6.0h, and then measure its length after cooling to 20°C according to re...

Embodiment 2

[0024] Prepare clean pulp according to the clean pulp composition in Table 2. Weigh first, and then fully dry-mix 52.5-grade ordinary cement, fly ash and nano-magnesia (provided by Hangzhou Wanjing New Material Co., Ltd., with an average diameter of 50nm, a MgO content of 99.90%, and a preparation temperature of 900-1100°C) , and then prepare the cement paste according to the preparation method of cement paste (GB / T1346-2011), and form three expansion specimens in a test mold of 25×25×280mm. After curing in a curing box at (20±1)°C for 24 hours, remove the mold and measure its initial length (accurate to 0.001mm). Afterwards, they are all maintained in water at (20±1) °C, and their length is measured during the specified curing time, and the linear expansion rate is finally calculated. And on the basis of curing in 20°C water for 365d, then autoclave curing in an autoclave (216°C and 2.0MPa saturated water vapor) for 6.0h, and then measure its length after cooling to 20°C acc...

Embodiment 3

[0030]Concrete was prepared according to the amount of concrete raw materials per square meter in Table 3. Weigh first, then dry-mix 52.5-grade ordinary cement, fly ash and nano-magnesia (provided by Hangzhou Wanjing New Material Co., Ltd., with an average diameter of 50nm, a MgO content of 99.90%, and a preparation temperature of 700-900°C) , and then prepare concrete according to the preparation method of ordinary concrete (GB / T50080-2002), and form three expansion specimens in a test mold of 100×100×515mm. After 24 hours of curing in a curing room at (20±2)°C, remove the mold and measure its initial length (accurate to 0.001mm). Afterwards, they are maintained in water at (20±2)°C, and their length is measured during the specified curing time, and the linear expansion rate is finally calculated.

[0031] When the content of nano-magnesium oxide is 0%, 2%, 4%, 6%, 8% and 10%, under the condition of curing in water for 365 days, their concrete linear expansion ratios are 68,...

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Abstract

The invention discloses an application of nanometer magnesium oxide in a cement base material as an expanding agent. The application method comprises the following steps: when the nanometer magnesium oxide is used as the expanding agent in the cement base material, the doping mass of the nanometer magnesium oxide is 1-10% of the mass of a gel material in the cement base material based on the mass of the magnesium oxide. The utilization of the nanometer magnesium oxide as the expanding agent has the advantages that the particle size of the magnesium oxide is 1-100 nm, uniform and stable volume expansion is generated in a doping range of 1-10%, and a poor volume stability problem cannot be generated; the nanometer magnesium oxide with different expanding properties, which are prepared at different temperature zones can be used in combination; the nanometer magnesium oxide can also be reasonably used with the conventional light-burnt magnesium oxide expanding agent or the conventional expanding agent using generated ettringite as an expanding source to produce the expanding agent with better properties.

Description

(1) Technical field [0001] The invention relates to the application of nano-magnesia, in particular to the application of nano-magnesia as an expansion agent in cement-based materials (concrete, mortar or cement slurry). (2) Background technology [0002] In the process of setting and hardening, Portland cement except for expansive cement and the cement slurry, mortar and concrete prepared by it all have autogenous volume shrinkage, dry shrinkage and cold shrinkage caused by heat of hydration, especially These shrinkages are especially pronounced in mass concrete such as dams, causing them to crack and reduce durability and service life. Therefore, try to eliminate or compensate for these shrinkages. [0003] In order to eliminate or compensate for the autogenous volume shrinkage, drying shrinkage and cold shrinkage caused by the heat of hydration of mass concrete, many methods have been adopted, such as using ettringite expansion source to produce micro-expansion slag ceme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/06
Inventor 叶青叶宇巡
Owner 浙江森立生态环境科技有限公司
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