A kind of sleeve grouting material for prefabricated building reinforcement connection

A technology for sleeve grouting and building steel bars, which is applied in the field of sleeve grouting materials, can solve the problems of small water consumption bandwidth, uneven quality, insufficient strength, etc., and achieve good initial fluidity, improved mechanical properties, and excellent early strength performance Effect

Active Publication Date: 2018-10-02
重庆市建筑科学研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foreign grouting materials have excellent performance and are widely used in domestic large-scale engineering construction projects, but the price is generally high; while the existing domestic grouting materials are of various types and the quality is uneven, and the overall level still has a certain gap with foreign countries. The main performance Poor fluidity of freshly mixed slurry, small water consumption bandwidth, insufficient strength, no early plastic expansion, etc., have a certain negative impact on project quality and project progress

Method used

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  • A kind of sleeve grouting material for prefabricated building reinforcement connection
  • A kind of sleeve grouting material for prefabricated building reinforcement connection
  • A kind of sleeve grouting material for prefabricated building reinforcement connection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The sleeve grouting material used for steel bar connection in this embodiment is made by mixing grouting material dry powder with water and water reducing agent. The grouting material dry powder is mixed with the following components, and each component is composed as follows according to mass percentage : Cement (the mass ratio of sulphoaluminate cement to Portland cement is 8:92) 42.1%, fine aggregate (quartz sand) 50%, silica fume 2.5%, superfine granulated blast furnace slag 2.5%, expansion agent 2.5%, retarder 0.15%, defoamer 0.25%; water-to-cement ratio 0.25, water-reducing agent mixed with 3.0% of the total amount of cementitious material.

[0035] Mix each component according to the ratio, and use a mortar mixer to stir for 4 to 5 minutes to prepare the grouting material.

Embodiment 2

[0037] The sleeve grouting material used for steel bar connection in this embodiment is made by mixing grouting material dry powder with water and water reducing agent. The grouting material dry powder is mixed with the following components, and each component is composed as follows according to mass percentage : Cement (the mass ratio of sulphoaluminate cement to Portland cement is 7:93) 42.5%, fine aggregate (quartz sand) 50%, silica fume 3.0%, superfine granulated blast furnace slag 2.1%, expansion agent 2.0%, retarder 0.2%, defoamer 0.20%; water-to-cement ratio 0.25, water reducer mixed with 2.5% of the total amount of cementitious materials.

[0038] Mix each component according to the ratio, and use a mortar mixer to stir for 4 to 5 minutes to prepare the grouting material.

Embodiment 3

[0040] The sleeve grouting material used for steel bar connection in this embodiment is made by mixing grouting material dry powder with water and water reducing agent. The grouting material dry powder is mixed with the following components, and each component is composed as follows according to mass percentage : Cement (the mass ratio of sulfoaluminate cement to Portland cement is 7:93) 42.5%, fine aggregate (quartz sand) 50%, silica fume 2.0%, superfine granulated blast furnace slag 2.5%, expansion agent 2.6%, retarder 0.15%, defoamer 0.25%; water-binder ratio 0.26, water-reducing agent mixed with 3.5% of the total cementitious material.

[0041] Mix each component according to the ratio, and use a mortar mixer to stir for 4 to 5 minutes to prepare the grouting material.

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Abstract

The invention discloses a sleeve grouting material for assembly type building steel bar connection, wherein the sleeve grouting material is formed by adding water and a water reducing agent to a steel bar sleeve grouting material dried powder and mixing; the sleeve grouting material dried powder is formed by mixing the following components by the mass percentage: 40-45% of cement, 45-55% of a fine aggregate, 2-3% of silica fume, 2-3% of superfine granulated blast furnace slag, 2-3% of an expanding agent, 0.1-0.2% of a set retarder, and 0.15-0.25% of a defoaming agent, wherein the water-binder ratio is 0.24-0.26, and the mixing amount of the water reducing agent is 2.5-3.5% of the total amount of cementitious materials. The sleeve grouting material has the advantages of high fluidity, high early and later strength, early micro-expansion, no shrinkage and no water bleeding at later stage, and no corrosion to steel bars, is grouted into a steel bar sleeve, can make the steel bars and the steel bars as well as the steel bars and the sleeve form firm connection, and has good durability.

Description

technical field [0001] The invention relates to the technical field of building engineering materials, in particular to a sleeve grouting material used for connecting steel bars in fabricated buildings. Background technique [0002] Prefabricated buildings refer to buildings assembled on site with prefabricated components in factories. Compared with cast-in-place concrete structures, prefabricated buildings can not only improve building quality and reduce construction personnel, but also save resources, energy, and reduce pollution and carbon emissions. , with broad prospects for development. Sleeve grouting technology is the key to the connection of prefabricated components, and has an important impact on the integrity and seismic performance of the assembled structure. The grouting material with high fluidity, early strength, high strength and micro-expansion is used to fill the gap between the sleeve and the ribbed steel bar. After the slurry solidifies and hardens, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06
CPCC04B28/06C04B2111/70C04B2201/50C04B7/02C04B14/06C04B18/146C04B18/141C04B2103/0068C04B24/10C04B24/42C04B22/002C04B24/24C04B2103/302C04B14/42
Inventor 李志坤刘严正宋开伟
Owner 重庆市建筑科学研究院有限公司
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