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Shield segment additive and preparation method

A shield tunnel segment and admixture technology, which is applied in the field of building materials, can solve the problems of poor appearance, low early strength, and poor construction performance of shield tunnel segments, save manpower and material resources, reduce repairing procedures, and have a beautiful surface. Effect

Inactive Publication Date: 2018-06-12
HUNAN ZHONGYAN BUILDING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems in the prior art that the shield tunnel segments produced by using the shield tunnel admixture have poor appearance, obvious color difference, water lines, poor construction performance and low early strength, which lead to slow demoulding, the purpose of the present invention One is to provide a shield segment admixture

Method used

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  • Shield segment additive and preparation method
  • Shield segment additive and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a kind of preparation method of shield segment admixture, comprising the following steps:

[0041] (1) Determine the distribution ratio of each component, add water to the container first, then add polycarboxylate high-performance water reducer, early strength agent, polyether synthetic defoamer, brightener and viscosity thixotropic agent in sequence, and mix and stir Uniform;

[0042] (2) Add air-entraining agent and stir evenly to get the finished product.

Embodiment 2

[0044] Using the preparation method provided in Example 1, seven shield segment admixtures A to G with different proportions were prepared in this example, and the specific formulations are shown in Table 1.

[0045] Table 1 Specific raw material components of admixtures A to G

[0046]

Embodiment 3

[0048] In the test, the concrete mix ratio was designed according to the subway segment strength grade C50, and the amount of each material in the concrete mix ratio is shown in Table 2.

[0049] Table 2 The amount of each material in concrete

[0050] Material

cement

fly ash

river sand

pebbles

water

Admixture

Mass (kg / m 3 )

390

60

708

1105

145

4.5

[0051] Apply admixtures A to G to the above concrete. The amount of admixture for the shield segment shall be 1.0% of the total amount of glue (cement + fly ash), and the concrete shall be prepared according to the methods in GB / 50152-92 and other standards. Performance measurement, measurement results are listed in Table 3.

[0052] Table 3 Performance test results of corresponding concrete with admixtures A~G added

[0053]

[0054] From the above tests, it can be seen that the shield segment admixture provided by the present invention can make the detection i...

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Abstract

The invention provides a shield segment additive. The shield segment additive is prepared from the following components in percentage by mass: 25.75 to 50.25 percent of polycarboxylic acid high-performance water-reducing agent, 1 to 3 percent of early strength agent, 0.01 to 0.5 percent of air entraining agent, 0.05 to 0.8 percent of polyether synthetic defoaming agent, 0.4 to 3.5 percent of brightening agent, 0.05 to 2 percent of viscosity thixotropic agent and the balance of water. The invention also provides a preparation method of the shield segment additive. By adoption of the shield segment additive provided by the invention, the thixotropy and peaceability requirements of concrete can be guaranteed while low slump degree of the concrete is controlled under the early strength settingtime requirement, the construction time of workers is saved, the strength of the concrete within 8 hours exceeds the form stripping requirement, the steam curing time of the concrete is shortened, amold turnover rate of a segmental factory is increased, and the production efficiency is improved; in addition, a surface is attractive after form stripping, a repairing process is reduced, and manpower and material resources are further saved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a shield segment admixture. Background technique [0002] The shield segment is the main assembly component of shield construction and the innermost barrier of the tunnel, which bears the role of resisting soil pressure, groundwater pressure and some special loads. The shield segment is the permanent lining structure of the shield tunnel. The quality of the shield segment is directly related to the overall quality and safety of the tunnel, and affects the waterproof performance and durability of the tunnel. In essence, the quality requirements for shield segments are the requirements for concrete, which require smooth surface, uniform color, clear edges and corners, no damage and pollution. In addition, due to the reduction of plastering time and static stop time, shortening of steam curing time and faster production speed during the production process of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32
CPCC04B40/0039C04B22/002C04B2103/302C04B24/122C04B24/32C04B24/02C04B14/042C04B2103/304C04B24/04
Inventor 谭贝李兴李权
Owner HUNAN ZHONGYAN BUILDING MATERIAL TECH CO LTD
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