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A cement-based high-performance micro-expansion filling grout

A grouting, cement-based technology, applied in the field of filling grouting and cement-based high-performance micro-expansion filling grouting, can solve the problems of poor application effect, poor adhesion of secondary lining concrete and high price, and achieve The effect of enhancing final setting strength and firmness, good material-liquid suspension stability and suitable density

Active Publication Date: 2019-01-04
CHINA RAILWAY ERJU 4TH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems in the prior art that the secondary lining backfilling grouting material of the tunnel has poor application effect, poor bonding force with the secondary lining concrete and high price, and provides a cement-based filling grouting material

Method used

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  • A cement-based high-performance micro-expansion filling grout
  • A cement-based high-performance micro-expansion filling grout
  • A cement-based high-performance micro-expansion filling grout

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Cement-based filling grout, composed of the following parts by mass of cementitious material, weighting agent, quartz sand and composite admixture: 440 parts of P·O42.5R ordinary Portland cement, R·S·AC 42.5R sulfoaluminic acid 74 parts of salt cement, silica fume powder (specific surface area 18000m 2 / g) 40 parts, YJ-4 cementing weighting agent (magnetite) 70 parts, 30 mesh to 50 mesh coarse quartz sand 185 parts, 50 mesh to 120 mesh fine quartz sand 185 parts, water reducer 5 parts. Under the environmental conditions within the range of normal air temperature 10-30 ℃, put the above raw material components into figure 1 In the dry powder mortar mixing equipment shown, fully stir and mix for 4 minutes, and pack in double-layer sealed bags.

[0060] The properties of the prepared cement-based grout are as follows: figure 2 As shown, it is mixed with water according to the water-material ratio of 0.19, fully stirred and mixed well, and the grouting material in the wor...

Embodiment 2

[0070] Cement-based filling grout, composed of the following parts by mass of cementitious material, weighting agent, quartz sand and composite admixture: 438 parts of 42.5R ordinary Portland cement, 75 parts of 42.5R sulfoaluminate cement, silica fume powder 40 parts, 69 parts of weighting agent, 187 parts of coarse quartz sand of 30-50 mesh, 185 parts of fine quartz sand of 50-120 mesh, 4 parts of water reducer. Under the environmental conditions within the normal temperature range of 10-30°C, put the above-mentioned raw material components into the dry powder mortar mixing equipment, fully stir and mix for 5 minutes, and pack them in double-layer sealed bags. After testing, the fluidity of the cement-based filling grouting material is 410mm, such as image 3 As shown, the results meet the requirements of technical indicators.

Embodiment 3

[0075] The cement-based filling grout consists of the following parts by mass of cementitious material, weighting agent, quartz sand and composite admixture: 440 parts of ordinary portland cement, 75 parts of sulphoaluminate cement, 40 parts of silica fume powder, weighting 70 parts of agent, 185 parts of coarse quartz sand of 30-50 mesh, 185 parts of fine quartz sand of 50-120 mesh, and 6 parts of composite admixture. Put the above raw materials into the dry powder mortar mixing equipment, fully stir and mix for 4 minutes, and pack them in double-layer sealed bags.

[0076] The cement slurry expansion rate testing instrument adopts plexiglass, and the instrument is equipped with a sealing cover to detect and analyze the cement slurry expansion rate. The cement-based filling grout prepared in this embodiment did not find bleeding in the plexiglass expansion rate test container, and its plastic expansion rate was as follows: Figure 4 As shown, the cement-based filling grout h...

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Abstract

The invention discloses a cement-based filling grouting material. The cement-based filling grouting material is a multi-component material being prepared from a cementing material, a weighting agent,quartz sand and a compound admixture, wherein components are prepared from the following materials in parts by mass: 438 to 440 parts of common silicate cement, 74 to 75 parts of sulphoaluminate cement, 39 to 40 parts of silica fume powder, 69 to 70 parts of the weighting agent, 182 to 187 parts of coarse quartz sand, 182 to 187 parts of fine quartz sand, and 4 to 7 parts of the compound admixture, wherein the coarse quartz sand is 30 to 50 meshes of quartz sand, and the fine quartz sand is 50 to 120 meshes of quartz sand. The cement-based grouting material disclosed by the invention is excellent in performance, various performance technical indicators are higher than existing specification standard requirements, and various grouting process constructions on sites can be met; moreover, thematerial is stable in quality and is good in adaptability.

Description

technical field [0001] The invention relates to a filling grout, in particular to a cement-based high-performance micro-expansion filling grout, which belongs to the field of civil engineering. The cement-based high-performance micro-expansion filling grouting of the invention is suitable for secondary lining hole treatment of tunnels, has high-performance micro-expansion characteristics, and has good filling and grouting effects. Background technique [0002] The excavation face during tunnel construction requires rapid initial lining to build up the base structure to provide the original support structure. When the tunnel is excavated to a certain extent, the secondary lining construction will be carried out to form a standard support structure inside the tunnel to provide a reliable and firm support structure for the tunnel after it is formed. [0003] Due to the long construction time interval between the primary lining structure and the secondary lining structure, when...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06C04B111/70
CPCC04B28/06C04B2111/00724C04B2111/70C04B2201/20C04B2201/50C04B7/02C04B18/146C04B14/06C04B18/12C04B20/0076C04B2103/302C04B2103/304C04B2103/12C04B2103/65C04B2103/0068
Inventor 王佩勋李超张超明张龙
Owner CHINA RAILWAY ERJU 4TH ENG
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