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Steam-curing-free durable concrete containing metakaolin and construction method of segments

A technology of metakaolin and concrete, which is applied in the field of metakaolin non-steam curing durable concrete and segment construction, which can solve the disadvantages of concrete strength, durability and cracks in the later stage, the lack of resistance to chloride ion penetration of concrete, and the impact on shield segment structure Safety and other issues, to achieve the effect of saving space and investment, good working performance and excellent durability

Active Publication Date: 2014-07-30
CCCC WUHAN HARBOR ENG DESIGN & RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that steam curing not only consumes a lot of energy, but also is unfavorable to the control of the strength, durability and cracks of concrete in the later stage. For example, under steam curing conditions, cement and the cementitious material of cement and fly ash accelerate the hydration of the segmental concrete. The high temperature rise makes it easier to crack, and the concrete's ability to resist chloride ion penetration is insufficient; and the strength of some segments cannot meet the requirements after steam curing, which leaves a large hidden danger to the safety of the engineering structure and affects the safety of the shield segment structure

Method used

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  • Steam-curing-free durable concrete containing metakaolin and construction method of segments
  • Steam-curing-free durable concrete containing metakaolin and construction method of segments
  • Steam-curing-free durable concrete containing metakaolin and construction method of segments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0027] 1) According to the weight ratio of the raw material components, respectively weigh Portland cement, fly ash, metakaolin, natural sand, crushed stone, polycarboxylate water reducer, and mixing water in corresponding parts by weight;

[0028] 2) Under the condition of 15℃~35℃, mix natural sand and crushed stone into component A, mix ordinary portland cement, fly ash and metakaolin into component B, mix polycarboxylate superplasticizer and Tap water is mixed as component C;

[0029] 3) Put component A into the concrete mixer, then add component B into the mixer, turn on the concrete mixer and mix for 10 seconds, then add component C into the mixer, and then mix components A, B and C together for 90 ~150 seconds stop;

[0030] 4) Put the steel cage precisely made according to the design size into the mold, and distribute the concrete prepared in 3) in two layers: lay the first layer first, vibrate the cloth at the same time, and lay the second layer after the vibration is...

Embodiment 4-6

[0051] According to the weight ratio of the raw material components, weigh the corresponding parts by weight of Portland cement, fly ash, metakaolin, natural sand, gravel, polycarboxylate water reducer, mixing water, and carry out The steps in Example 1-3 make metakaolin non-steam curing durable concrete segments. The weight ratio of raw material components is as shown in table 4:

[0052] Each component of table 4 embodiment 4-6 is composed

[0053]

[0054] The main performance parameters of the concrete that each embodiment makes in table 4 are as shown in table 5:

[0055] Table 5 embodiment 4-6 makes concrete performance index

[0056]

[0057] Each raw material parameter is as follows among the embodiment 4-6:

[0058] The Portland cement used is P.O.42.5 Portland cement produced by Ningbo Yuyao Shunjiang Cement Factory, with a specific surface area of ​​360m 2 / kg, standard consistency water consumption 27.4%, initial setting time 146min, final setting time 20...

Embodiment 7-9

[0066] According to the weight ratio of the raw material components, weigh the corresponding parts by weight of Portland cement, fly ash, metakaolin, natural sand, gravel, polycarboxylate superplasticizer, and mixing water, and carry out the mixing process at 30°C. The steps in Example 1-3 make metakaolin non-steam curing durable concrete segments. The weight ratio of raw material components is as shown in table 6:

[0067] Each component composition of table 6 embodiment 7-9

[0068]

[0069] The main performance parameters of the concrete that each embodiment makes in table 6 are as shown in table 7:

[0070] Table 7 embodiment 7-9 makes concrete performance index

[0071]

[0072] The ordinary Portland cement used in the present embodiment 7-9 is the P.O.42.5 type Portland cement produced by Ningbo Yuyao Shunjiang Cement Factory, and the specific surface area is 360m 2 / kg, standard consistency water consumption 27.4%, initial setting time 146min, final setting tim...

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Abstract

The invention discloses high-performance steam-curing-free durable concrete containing metakaolin and a construction method of segments. The steam-curing-free durable concrete containing metakaolin is characterized by comprising the following components in parts by weight: 100 parts of silicate cement, 10-50 parts of pulverized fuel ash, 5-20 parts of metakaolin, 180-280 parts of natural sand, 300-370 parts of broken stone, 0.6-1.0 part of polycarboxylate water reducer, and 37-45 parts of mixing water. Concrete segments with the designed size and shape, which are prepared by the construction method disclosed by the invention, have the characteristics of good operation performance, achievement of rapid turnaround of a mold without steam curing, low energy consumption, high early-stage, middle-stage and later-stage mechanical properties, excellent durability and good volume stability.

Description

technical field [0001] The invention relates to the technical field of shield tunnel segment concrete, in particular to a metakaolin non-steam curing durable concrete and a segment construction method. Background technique [0002] With the continuous development of urban construction scale, major cities have successively carried out the construction of major urban infrastructure projects such as rail transit projects and underground tunnel projects. Concrete prefabricated shield segments are widely used in rail transit projects and other underground tunnel projects middle. [0003] At present, steel molds are generally used for shield segments in rail transit projects and other underground tunnel projects. The use of vacuum suction cups or hoisting and demoulding methods requires the demoulding strength to reach 15MPa and 20MPa respectively, while the compressive strength of ordinary segment concrete reaches 15MPa. It takes at least 24 hours, which limits the turnover of s...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/08C04B14/06C04B14/02C04B14/10
CPCY02W30/91
Inventor 张鸿屠柳青秦明强占文徐文冰刘松李进辉李遵云叶志坤
Owner CCCC WUHAN HARBOR ENG DESIGN & RES
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