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Special high-impermeability shrinkage-compensating concrete for urban underground comprehensive pipe galleries and preparation method thereof

A comprehensive pipe gallery and shrinkage compensation technology, which is applied in the field of concrete, can solve the problems affecting the anti-permeability and crack resistance of concrete, and the micro-cracks have no effect, so as to improve the impermeability and crack resistance, reduce the porosity, and improve the compactness degree of effect

Active Publication Date: 2020-01-10
中建西部建设北方有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the concrete mixing process, the expansion agent and the humidity compensation medium will reduce the probability of concrete cracks to a certain extent, but they have little effect on the micro-cracks that have been produced during the hardening process of the concrete, thus affecting the later penetration resistance and resistance of the concrete. Crack performance

Method used

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  • Special high-impermeability shrinkage-compensating concrete for urban underground comprehensive pipe galleries and preparation method thereof
  • Special high-impermeability shrinkage-compensating concrete for urban underground comprehensive pipe galleries and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A preparation method of high anti-seepage compensation shrinkage concrete specially used for urban underground utility tunnels, comprising the following steps:

[0046] S1: Prepare the mixture: according to parts by weight, mix 10 parts of stones and 15 parts of tailings and stir evenly, then add 8 parts of cement, 1 part of fly ash, 1 part of microbeads, and 1 part of nano-mineral powder; add 0.05 part of basalt fiber, 0.08 part of polypropylene mesh fiber, 0.5 part of expansion agent, 0.1 part of cement-based osmotic crystalline material and 25 parts of sand are added, mixed evenly and then stirred for 30 seconds to obtain the mixture; among them, the cement uses 42.5 grade silicate Cement; wherein, the nano-mineral powder is nano-SiO 2 , Nano CaCO 3 , The mixture of nano clay with a weight ratio of 1:0.8:0.6;

[0047] S2: Pre-wet the mixture: add 1.2 parts of mixing water to the mixture, and stir for 50s to fully pre-wet the mixture;

[0048] S3: Preparation of mi...

Embodiment 2

[0051] A preparation method of high anti-seepage compensation shrinkage concrete specially used for urban underground utility tunnels, comprising the following steps:

[0052] S1: Prepare the mixture: according to parts by weight, mix 18 parts of stones and 20 parts of tailings and stir evenly, then add 14 parts of cement, 3 parts of fly ash, 2 parts of microbeads, and 3 parts of nano-mineral powder, add 0.12 parts of basalt fiber, 0.13 part of polypropylene mesh fiber, 2.3 parts of expansion agent, 0.6 part of cement-based osmotic crystalline material and 32 parts of sand are added, mixed evenly and then stirred for 35 seconds to obtain the mixture; among them, the cement uses 52.5 grade silicate Cement; wherein, the nano-mineral powder is nano-SiO 2 , Nano CaCO 3 , a mixture of nano clay with a weight ratio of 1:0.9:0.8;

[0053] S2: Pre-wet the mixture: add 3 parts of mixing water to the mixture and stir for 55s to fully pre-wet the mixture;

[0054] S3: Preparation of m...

Embodiment 3

[0057] A preparation method of high anti-seepage compensation shrinkage concrete specially used for urban underground utility tunnels, comprising the following steps:

[0058] S1: Preparation of mixture: according to parts by weight, mix 25 parts of stones and 25 parts of tailings and stir evenly, then add 20 parts of cement, 5 parts of fly ash, 4 parts of microbeads, and 4 parts of nano-mineral powder, add 0.2 parts of basalt fiber, 0.16 parts of polypropylene mesh fiber, 3 parts of expansion agent, 1 part of cement-based permeable crystalline material and 40 parts of sand are added, mixed evenly and then stirred for 40 seconds to obtain the mixture; among them, the cement uses 42.5 grade silicate Cement; wherein, the nano-mineral powder is nano-SiO 2 , Nano CaCO 3 , The mixture of nano clay with a weight ratio of 1:1.2:1.3;

[0059] S2: Pre-wet the mixture: add 6 parts of mixing water to the mixture and stir for 60s to fully pre-wet the mixture;

[0060] S3: Preparation o...

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Abstract

The invention relates to a special high-impermeability shrinkage-compensating concrete for urban underground comprehensive pipe galleries, and belongs to the technical field of concrete. The special high-impermeability shrinkage-compensating concrete for urban underground comprehensive pipe galleries comprises, by weight, 8 to 20 parts of cement. 10 to 25 parts of pebbles, 15 to 25 parts of tailings; 25 to 40 parts of sand, 1 to 5 parts of fly ash, 1 to 4 parts of microspheres, 1 to 4 parts of nano mineral powder, 0.05 to 0.2 part of basalt fiber, 0.08 to 0.16 part of polypropylene net-shapedfiber, 0.1 to 1 part of a water reducing agent component, 0.5 to 3 parts of an expanding agent, 0.1 to 1 part of a cement-based capillary crystalline material and 3 to 10 parts of mixing water I; theinvention further relates to a preparation method of the special high-impermeability shrinkage-compensating concrete for urban underground comprehensive pipe galleries. The preparation method comprises the following steps: S1, preparing a mixture; S2, pre-wetting the mixture; S3, preparing a mixed water agent; and S4, preparing the concrete. The anti-seepage and anti-cracking performance of concrete in the later period can be improved, and shrinkage of concrete is reduced.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a special high-impermeability shrinkage-compensating concrete for urban underground utility tunnels and a preparation method thereof. Background technique [0002] The comprehensive pipe gallery is one of the important symbols of the modernization of new urban municipal infrastructure construction in the 21st century. It avoids the disadvantages of repeated excavation of roads due to buried or repaired pipelines. However, the comprehensive pipe gallery is usually built in the rock and soil layer below the surface, which will be eroded by groundwater to varying degrees. Therefore, it is necessary for the concrete to meet the durability requirements such as impermeability and crack resistance while meeting the compressive requirements. [0003] The existing Chinese patent whose notification number is CN100506737C can be referred to, which discloses a kind of low-shrinkage, fire-pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/27C04B111/34C04B111/56C04B111/94
CPCC04B28/04C04B2111/00293C04B2111/27C04B2111/343C04B2111/56C04B2111/94C04B2201/50C04B14/02C04B18/12C04B18/08C04B14/46C04B16/0633C04B14/06C04B14/062C04B14/28C04B14/10C04B22/066C04B2103/0068C04B2103/302C04B24/06C04B24/10C04B24/26C04B24/32C04B24/16C04B24/42
Inventor 罗作球姚源王军张凯峰秦志勇孟刚刘江非欧阳平王敏胡宇博童小根王佳敏
Owner 中建西部建设北方有限公司
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