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Post-tensioned prestressed porelike grouting agent and preparation method thereof

A post-tensioning prestressing and channel grouting technology, which is applied in the field of building materials, can solve problems such as unprotected steel bars, insufficient grouting, and oversensitive dosage, and achieve controllable setting time, improved cost performance, and a range of dosage big effect

Inactive Publication Date: 2017-07-28
GUIZHOU KEZHIJIE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In August 2011, the Ministry of Communications proposed JTG / T F50-2011 "Technical Specifications for Construction of Highway Bridges and Culverts", which requires the grouting agent to have high fluidity, no segregation, no bleeding, and no shrinkage in the later stage. The specific standards are listed in Table 1. Although The new standard has been put forward for several years, but the fluidity of domestic grouting agent products is still poor, the slurry is seriously segregated at the bottom, the surface layer is peeled after coagulation, and the pores are concentrated, resulting in low strength, shrinkage in the later stage, and the grouting is not dense. These shortcomings lead to the inability to protect the steel bars, reduce the bearing capacity of the infrastructure, and fail to meet the requirements of the new standard

Method used

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  • Post-tensioned prestressed porelike grouting agent and preparation method thereof
  • Post-tensioned prestressed porelike grouting agent and preparation method thereof
  • Post-tensioned prestressed porelike grouting agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A preparation method of the above-mentioned post-tensioned prestressed tunnel grouting agent, comprising the steps of:

[0040] (1) Weigh each component: heavy calcium powder 53%, Point-400s retarded superplasticizer powder 3.3%, Point-600s retarded super early strength superplasticizer powder 5.73%, tartaric acid 2%, Hydroxypropyl Cellulose 2%, Sheet Silicate Mineral 5%, Calcium Sulphoaluminate Swelling Agent 16%, EDPA 6%, EDTMPS 6%, Sodium Lauryl Sulfate 0.35%, Polyoxyethylene Polyoxypropylene Pentaerythritol Ether defoamer 0.62%;

[0041] (2) Add mineral admixture and expansion agent into the mixer first, and stir for 5 minutes.

[0042] (3) Add water reducing agent, retarder, thixotropic agent, suspending agent, air-entraining agent and defoamer to the material obtained in step (2), and continue stirring for 20 minutes.

[0043] The post-tensioned prestressed tunnel grouting agent prepared above was mixed into Hongshi cement, the dosage was 10%, and the water-bind...

Embodiment 2

[0045] A preparation method of the above-mentioned post-tensioned prestressed tunnel grouting agent, comprising the steps of:

[0046] (1) Weigh each component: heavy calcium powder 20%, light calcium powder 38%, Point-400s retarded superplasticizer powder 6.37%, Point-800s retarded superplasticizer powder 3%, three Sodium polyphosphate 3%, sheet silicate mineral 4%, hydroxyethyl cellulose 3%, calcium oxide expander 18%, anionic polyacrylamide 3.5%, sodium lauryl sulfate 0.38%, higher alcohol fatty acid Ester complex 0.75%;

[0047] (2) Add mineral admixture and expansion agent into the mixer first, and stir for 5 minutes.

[0048] (3) Add water reducing agent, retarder, thixotropic agent, suspending agent, air-entraining agent and defoamer to the material obtained in step (2), and continue stirring for 20 minutes.

[0049] The above-mentioned post-tensioned prestressed tunnel grouting agent was mixed into Jiangtian cement, the dosage was 10%, and the water-binder ratio was ...

Embodiment 3

[0051] A preparation method of the above-mentioned post-tensioned prestressed tunnel grouting agent, comprising the steps of:

[0052] (1) Weigh each component: ultrafine quartz sand 32%, heavy calcium powder 24%, Point-600s retarded super early strength superplasticizer powder 4.40%, Point-800s retarded superplasticizer powder 7.42%, tartaric acid 1%, sodium tripolyphosphate 1%, sheet silicate mineral 3%, cellulose fiber 2%, alum stone expansion agent 21%, cationic polyacrylamide 3%, sodium lauryl sulfate air-entraining Agent 0.36%, fatty alcohol polyoxyethylene ether defoamer 0.82%;

[0053] (2) Add mineral admixture and expansion agent into the mixer first, and stir for 5 minutes.

[0054](3) Add water reducing agent, retarder, thixotropic agent, suspending agent, air-entraining agent and defoamer to the material obtained in step (2), and continue stirring for 20 minutes.

[0055] The above-mentioned post-tensioned prestressed tunnel grouting agent was mixed into conch ce...

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Abstract

The invention discloses a post-tensioned prestressed porelike grouting agent and a preparation method thereof. The post-tensioned prestressed porelike grouting agent comprises, by weight, 40-70 parts of mineral admixtures, 8-12 parts of water reducers, 2-5 parts of retarders, 3-8 parts of thixotropic agents, 13-22 parts of expanding agents, 2-14 parts of suspending agents, 0.3-0.5 part of air entraining agents and 0.6-1.0 part of defoaming agents. The post-tensioned prestressed porelike grouting agent has the advantages of low water-binder ratio, high flowability, zero water seeping and early micro-expansion property and eliminates the problems of porelike grouting incompactness, later shrinkage, strength non-compliance and the like due to increase of water consumption for meeting the requirement of flowability in a certain construction site by the aid of the advantages, so that the quality of a concrete structure bridge is ensured.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a post-tensioned prestressed channel grouting agent and a preparation method thereof. Background technique [0002] In August 2011, the Ministry of Communications proposed JTG / T F50-2011 "Technical Specifications for Construction of Highway Bridges and Culverts", which requires the grouting agent to have high fluidity, no segregation, no bleeding, and no shrinkage in the later stage. The specific standards are listed in Table 1. Although The new standard has been put forward for several years, but the fluidity of domestic grouting agent products is still poor, the slurry is seriously segregated at the bottom, the surface layer is peeled after coagulation, and the pores are concentrated, resulting in low strength, shrinkage in the later stage, and the grouting is not dense. These shortcomings lead to the failure to protect the steel bars, reduce the bearing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B24/32
CPCC04B40/0039C04B14/28C04B2103/302C04B24/06C04B24/383C04B14/04C04B22/14C04B24/16C04B24/32C04B24/123C04B24/003C04B28/00C04B22/16C04B22/064C04B24/2652C04B24/08C04B14/06C04B18/24C04B22/148
Inventor 蒋禹邓磊刁立柱沈建荣罗小峰
Owner GUIZHOU KEZHIJIE NEW MATERIAL