Marine cement doped with modified metakaolin

A technology of metakaolin and marine cement, which is applied in cement production, etc., to achieve the effects of improving durability, solving the problem of anti-erosion ability, and improving the performance of anti-chloride ion penetration

Inactive Publication Date: 2014-10-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a kind of marine cement mixed with modified metakaolin, which can significantly improve the anti-chloride ion penetration performance of concrete, solve the problem of

Method used

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  • Marine cement doped with modified metakaolin

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Effect test

Embodiment 1

[0030] Embodiment 1, a kind of marine cement mixed with modified metakaolin, according to the weight ratio of raw materials is 42.5 grade Portland cement 100, S105 slag powder 50, fly ash 35, silica fume 10, white carbon black 6 and modified Weigh the raw materials of metakaolin 50, put them in a mixer and mix them mechanically to get the desired product, which is recorded as C1. Wherein: the preparation method of modified metakaolin is as follows:

[0031] 1) Mix kaolin and kiln dust evenly at a weight ratio of 9:1, and then put them into the muffle furnace;

[0032] 2) Set the heating rate of the muffle furnace so that the sample can be heated from room temperature to 800°C ± 20°C within 15 minutes, and kept in this temperature range for 20 minutes;

[0033] 3) After the calcination, the sample is taken out and quenched in the air, and the sample is ground to make the fineness meet 80 μm and the sieve residue is less than 1.0%, that is, the required modified metakaolin is o...

Embodiment 2

[0035]Embodiment 2, a kind of marine cement mixed with modified metakaolin, according to the weight ratio of raw materials is 52.5 grade Portland cement 100, S95 slag powder 75, fly ash 25, silica fume 15, white carbon black 5 and modified Weigh the raw materials of metakaolin 35, place them in a mixer and mix them mechanically to obtain the desired product, which is recorded as C2. The preparation method of modified metakaolin is the same as that in Example 1. According to the electric flux method stipulated in GB / T 50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete", the anti-chloride ion penetration performance of concrete is reflected. The results show that the marine concrete sample prepared by C2 is more than the The total electric flux of concrete samples formulated with 52.5 grade Portland cement was reduced by 73.2%.

Embodiment 3

[0036] Embodiment 3, a kind of marine cement mixed with modified metakaolin, according to the weight ratio of raw materials is 52.5 grade Portland cement 100, S105 slag powder 75, fly ash 25, silica fume 20, white carbon black 5 and modified The raw materials were weighed for metakaolin 30, placed in a mixer and mechanically mixed evenly to obtain the desired product, which was recorded as C3. The preparation method of modified metakaolin is the same as that in Example 1. According to the electric flux method stipulated in GB / T 50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete", the anti-chloride ion penetration performance of concrete is reflected. The results show that the marine concrete sample prepared by C3 is more than the The total electric flux of concrete samples prepared with 52.5 grade Portland cement was reduced by 75.1%.

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to a marine cement doped with modified metakaolin. The marine cement doped with modified metakaolin is prepared by evenly mixing the following raw materials at a certain weight ratio: portland cement, slag powder, pulverized fuel ash, silica fume, white carbon black and modified metakaolin. The marine cement doped with modified metakaolin has the advantages of being simple in preparation technology, good in anti-cracking performance and the like; the chloride ion penetration resistance property of the concrete can be improved obviously, the anti-erosion capability of concrete in a large-volume water conservancy project under a marine environment can be solved, and the durability, strength and other working performances of a concrete structure in the water conservancy project under a marine environment can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a marine cement mixed with modified metakaolin. Background technique [0002] In recent years, the construction of offshore projects such as ports, coastal protection, cross-sea bridges, and offshore drilling platforms in my country has developed rapidly. , the durability of marine concrete has been paid more and more attention. [0003] The most common form of damage to marine concrete is the cracking and spalling of the concrete protective layer caused by the corrosion of internal steel bars. The reason for this is that chloride ions in the marine environment easily diffuse into the interior of the concrete structure and accumulate on the surface of the steel bar. When the critical concentration is reached It will destroy the passivation film on the surface of the steel bar in the concrete structure, cause the steel bar to corrode and expand in volume, an...

Claims

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Application Information

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IPC IPC(8): C04B7/26
CPCY02P40/10
Inventor 孙振平水亮亮李春景杨旭杨海静
Owner TONGJI UNIV
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