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Post-tensioning prestressed concrete porelike grouting agent and preparation method thereof, and grouting material

A channel grouting and prestressing technology, applied in the field of building materials, can solve the problem that the grouting agent cannot meet the requirements of the new specification, and achieve the effects of large degree of freedom in formula adjustment, good compatibility and a wide range of sources.

Inactive Publication Date: 2013-10-30
HENAN PROVINCIAL TRANSPORTATION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to further improve the quality of my country's highway bridges, the new version of "Technical Specifications for Construction of Highway Bridges and Culverts" (JTG / T F 50-2011) puts forward very high requirements for grouting materials. Most of the grouting agents commonly used in the market cannot Meet the requirements of the new specification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The content of various materials according to the following mass percentages is:

[0024] Silica fume powder 81.0%

[0025] Polycarboxylate superplasticizer 2.5%

[0026] Calcium sulfoaluminate expansion agent 12.0%

[0027] Organic bentonite anti-settling agent 0.5%

[0028] Polysiloxane defoamer 0.8%

[0029] Sodium metaphosphate retarder 1.2%

[0030] Amino alcohol rust inhibitor 2.0%

[0031] The above materials were mixed and placed in a mixer for stirring, the speed of the mixer was 1400 r / min, the linear speed of the paddle was 16 m / s, and stirred for 12 minutes to obtain a grouting agent. Mix the above-mentioned grouting agent with portland cement with a strength grade of 42.5 at a mass ratio of 1:9, add water (water-cement ratio 0.26) and stir evenly in a pulping equipment to obtain a grouting material.

[0032] The above-mentioned grouting material uses a funnel viscometer to measure 1725ml and set aside time. The initial fluidity is 12s, the fluidity af...

Embodiment 2

[0034] The content of various materials according to the following mass percentages is:

[0035] Quartz powder 42.5%

[0036] Blast furnace slag 40.0%

[0037] Polycarboxylate superplasticizer 5.0%

[0038] Concrete expansion agent (UEA-H) 8.0%

[0039] Fumed silica anti-settling agent 0.5%

[0040] Polyether defoamer 0.8%

[0041] Borax retarder 1.2%

[0042] Silicone rust inhibitor 2.0%

[0043] The above materials were mixed and placed in a blender for stirring, the speed of the blender was 1400 r / min, the linear speed of the paddle was 15 m / s, and stirred for 15 minutes to obtain a grouting agent. Mix the above-mentioned grouting agent with ordinary Portland cement according to the mass ratio of 1:8, add water (water-binder ratio 0.27) and stir evenly in the pulping equipment to prepare the grouting material.

[0044] The above-mentioned grouting material is measured with a funnel viscometer at 1725mL to allow time, the initial fluidity is 13s, the fluidity is 17s a...

Embodiment 3

[0046] The content of various materials according to the following mass percentages is:

[0047] Portland cement of strength class 42.5 78.5%

[0048] Calcium oxide expander 12.0%

[0049] Naphthalenesulfonate formaldehyde condensation product superplasticizer 5.0%

[0050] Fumed silica anti-settling agent 0.3%

[0051] Natural oil defoamer 1.2%

[0052] Sodium fluorosilicate retarder 1.0%

[0053] Aminocarboxylic acid rust inhibitor 2.0%

[0054]The above materials were mixed and placed in a blender for stirring, the speed of the blender was 1600 r / min, the linear speed of the paddle was 14 m / s, and stirred for 12 minutes to obtain a grouting agent. Mix the above grouting agent with ordinary Portland cement at a mass ratio of 1:10, add water (water-cement ratio 0.28) and stir evenly under certain conditions to obtain the grouting material.

[0055] The above-mentioned grouting material is measured with a funnel viscometer at 1725mL to allow time, the initial fluidity is...

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Abstract

The invention belongs to the technical field of building materials, and particularly discloses a post-tensioning prestressed concrete porelike grouting agent and a preparation method thereof, and a grouting material. The grouting agent comprises the following components in percentage by weight: 65 to 85 percent of a mineral admixture, 2 to 10 percent of a water reducing agent, 3 to 20 percent of an expanding agent, 0.2 to 0.6 percent of an antisettling agent, 0.4 to 1.5 percent of an antifoaming agent, 0.1 to 5 percent of a retarder and 0.1 to 5 percent of a corrosion inhibitor, wherein the alkalinity of the expanding agent is less than 0.5 percent, and the chloridion content of the expanding agent is less than 0.03 percent. The grouting material is prepared by mixing the grouting agent, the cement and the water and uniformly stirring. The post-tensioning prestressed concrete porelike grouting agent has the characteristics of low water-binder ratio, high flowability, zero water leakage, low expandability, high pumpability, large formula adjustment degree of freedom and simple operation, and cannot be layered. Particularly, the post-tensioning prestressed concrete porelike grouting agent totally meets the requirement of the road, bridge and culvert construction technical standard (JTG / TF50-2011), and is particularly suitable for porelike grouting for roads, bridges and culverts.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a grouting agent for post-tensioned prestressed concrete channels, a preparation method and a grouting material. Background technique [0002] Prestressed concrete technology is a new technology that was promoted during the "Ninth Five-Year Plan" and "Tenth Five-Year Plan" by the Ministry of Construction. It is widely used in buildings, bridges and special engineering structures, and is an indispensable and important part of construction technology. The key technology to ensure the service life of the prestressed concrete structure is to make the prestressed tunnel grouting dense, reduce the loss of prestressed force, and prevent the corrosion of steel bars. Post-tensioned prestressed concrete channel grouting construction technology is a new technology and a key procedure in the prestressed concrete construction process. In prestressed concrete structures...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
Inventor 赵豫生张正珂李志强王立志王学振黄正强黄运军马春峰李宇伟李玉磊汪德才李红涛张书华潘华
Owner HENAN PROVINCIAL TRANSPORTATION RES INST
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