Modified metakaolin-based permeation-resistant and crack-resistant agent for concrete

A technology of metakaolin and concrete, which is applied in the field of modified metakaolin-based concrete anti-seepage cracking agent, which can solve the problems of reduced concrete work performance, mutual interference of water-reducing agents, and influence on normal construction, so as to slow down seepage and corrosion, reduce Porosity, effect of inhibiting intrusion

Active Publication Date: 2012-06-27
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But on the other hand, when mixed with metakaolin alone, it will significantly reduce the performance of concrete, and even affect the normal construction.
In order to ensure the working performance of metakaolin concrete, some studies have directly mixed solid water reducing agents into metakaolin admixtures as composite admixtures. This type of pre-compound water reducing agent may have poor adaptability to cement. problems, and may interfere with the water reducing agent used in the construction process, so this method still has problems in the actual application process

Method used

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  • Modified metakaolin-based permeation-resistant and crack-resistant agent for concrete
  • Modified metakaolin-based permeation-resistant and crack-resistant agent for concrete

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Embodiment 1-3

[0029] A modified metakaolin-based concrete anti-seepage cracking agent, which is prepared from modified metakaolin, ground limestone powder, ultra-fine fly ash, roasted hydrotalcite, ground quartz sand and solid silane powder, the raw materials The specific mass percentages are respectively 10%-75%, 5%-40%, 4%-40%, 1%-20%, 2%-20% and 0.2%-20%. The sum of the percentages of each component is 100%.

[0030] Based on C50 concrete, the modified metakaolin-based concrete anti-seepage and cracking agent is used to replace the cementitious material in the same amount to configure the concrete. The design composition ratio of the cementitious material in the concrete is shown in Table 1. The dosage of the benchmark concrete cementitious material is 435kg, and the water-cement ratio is 0.33.

[0031] Table 1 Concrete sample cementitious material composition ratio

[0032]

[0033] According to GB / T 50080-2002 "General Concrete Mixture Performance Test Method Standard" test the sl...

Embodiment 4-6

[0047] A modified metakaolin-based concrete anti-seepage cracking agent, which is prepared from modified metakaolin, ground limestone powder, ultra-fine fly ash, roasted hydrotalcite, ground quartz sand and solid silane powder, the raw materials The specific mass percentages are 210%-75%, 5%-40%, 4%-40%, 1%-20%, 2%-20% and 0.2%-20%, respectively. The sum of the percentages of each component is 100%.

[0048] Taking C40 marine concrete as the benchmark, the modified metakaolin-based concrete anti-seepage cracking agent is used to replace the cementitious material in the same amount to configure the concrete. The design composition ratio of the cementitious material in the concrete is shown in Table 4. The dosage of the benchmark concrete cementitious material is 423kg, and the water-cement ratio is 0.36.

[0049] Table 4 Concrete sample cementitious material composition ratio

[0050]

[0051] The fly ash described in Table 4 is a secondary fly ash with a fineness of 45 μm...

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Abstract

The invention discloses a modified metakaolin-based permeation-resistant and crack-resistant agent for concrete. The modified metakaolin-based permeation-resistant and crack-resistant agent for concrete comprises: by mass, 10 to 75% of modified metakaolin, 5 to 40% of fine limestone powder, 4 to 40% of superfine coal ash, 1 to 20% of calcined hydrotalcite, 2 to 40% of fine quartz sand and 0.2 to 20% of solid silane powder. A preparation method of the modified metakaolin comprises the following steps of putting dry and washed kaolin into a bowl mill, carrying out grinding to obtain kaolin powder, carrying out calcination of the kaolin powder at a temperature of 500 to 1000 DEG C for 0.5 to 6.0 hours to obtain metakaolin, putting the metakaolin into a dispersion machine, adding an organic modifier of sulfamate or triethanolamine into the metakaolin, wherein a mass ratio of the metakaolin and the organic modifier is in a range of (5000: 1) to (100: 1), and carrying out dispersion to obtain the modified metakaolin having a contact angle of 50 to 100 degrees and a specific surface area of 8000 to 15000m<2>/kg. The modified metakaolin-based permeation-resistant and crack-resistant agentfor concrete can be utilized as a concrete additive, improves strength of concrete at different ages, does not produce obvious influences on concrete work performances, obviously improves anti-chloride ion penetration capability of concrete, reduces total shrinkage of concrete and improves crack resistance of concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a modified metakaolin-based concrete anti-seepage and crack-resistance agent. Background technique [0002] With the development of society and the advancement of science and technology, the application field of reinforced concrete has been expanding, and gradually extended to marine engineering and other harsh environments. Therefore, this has higher requirements for the ability of concrete to resist various erosions. Reinforced concrete often works under the environmental conditions rich in chloride and sulfate. After a long period of erosion, the corrosive media such as chloride and sulfate in the environment will enter the concrete, resulting in corrosion of the reinforcement or expansion of the concrete volume, and finally causing the corrosion of the reinforcement. failure of concrete structures. At the same time, whether it is ordinary concrete or h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/10
Inventor 水中和王康曾伟能陈伟王桂明梅明军杨增良
Owner WUHAN UNIV OF TECH
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