As the key technical product of prefabricated concrete structure, cementitious grout for coupler of rebar splicing is one of the patented technical products developed by SINO-SINA.
GENERAL
As the key technical product of prefabricated concrete structure, cementitious grout for coupler of rebar splicing is one of the patented technical products developed by SINO-SINA.
FEATURE
1. Technical principle and product features
CBGM series sleeve grouting materials for reinforcement connection are divided into semi grouting connection and full grouting connection according to the sleeve structure.
◆Semi grouting connection
Semi grouting connection is usually that the upper reinforcement adopts straight thread, and the lower reinforcement is connected with the grouting sleeve through grouting material. It is generally used for the connection of main reinforcement of prefabricated shear wall and frame column, so the sleeve is grouting straight thread connection sleeve, which is referred to as grouting sleeve for short.
◆Full grouting connection
Full grouting connection refers to the connection between reinforcement at both ends and sleeve through grouting material, which is generally used for the connection of main reinforcement of precast frame beam. Grouting connecting sleeve, hereinafter referred to as grouting sleeve
2. Construction operation process and key points
2.1 Flow chart of grouting connection installation on site
Grouting pump and gun
| Type | Electric grouting pump | Manual grouting gun |
| Scope of application | Multiple joints are grouted through the horizontal joint communication cavity | The grouting of a single joint or the grouting of a small number of joints in the connecting cavity of the shear wall through the horizontal joint is not longer than 30cm |
| Power Supply | 3 phase,380V/50Hz | nothing |
| Rated flow | 5L/min 2.6L/min(pump sleeve grouting material for CGM reinforcement connection) | Manual |
| Rated pressure | 1.2MPa | ---- |
| Bin capacity | 20L | Gun cavity 0.7L |
| Picture |  |  |
PERFORMANCE
■CBGM sleeve grouts for reinforcement connection
1. Features and scope of application
CBGM sleeve grouting material for reinforcement connection is a cement-based grouting material specially used for reinforcement sleeve connection. This product has small aggregate particles, large fluidity, high early strength and good timeliness. It is suitable for reinforcement connection of prefabricated components of various concrete structures.
| Technical index | Standard:JG/T408-2013 Sleeve Grouting Material for Reinforcement Connection | |
| Program | Performance metrics | |
| Fluidity, mm | Initial | ≥300 |
| 30min | ≥260 | |
| Compressive strength, MPa | 1d | ≥35 |
| 3d | ≥60 | |
| 28d | ≥85 | |
| Vertical expansion rate,% | 3h | ≥0.02 |
| Different between 24h and 3h | 0.02-0.5 | |
| Chloride ion content,% | ≤0.03 | |
| Bleeding rate,% | 0 | |
Materials entering the site can only be used after passing the inspection according to relevant standards. Generally inspect the fluidity and strength on site.
| Technical index of low temperature sleeve grouting material | ||
| Programs | Performance metrics | |
| Fluidity at -5 ℃, mm | Initial | ≥300 |
| 30min | ≥260 | |
| Fluidity at 8 ℃, mm | Initial | ≥300 |
| 30min | ≥260 | |
| Compressive strength, MPa | -1d | ≥35 |
| -3d | ≥60 | |
| -7d+21da | ≥85 | |
| Vertical expansion rate,% | 3h | 0.02~2 |
| Different between 24h and 3h | 0.02~0.40 | |
| 28d Self-drying shrinkage,% | ≤0.045 | |
| Chloride ion contentb,% | ≤0.03 | |
| Bleeding rate,% | 0 | |
| a-1d represents curing at negative temperature for 1d, -3d represents curing at negative temperature for 3d, -7d+21d represents curing at negative temperature for 7d then turned to standard curing for 21d. | ||
| bThe chloride ion content is based on the total amount of grouting materials. | ||
Test method
General requirements
When the test piece of normal temperature sleeve grouting material is formed, the temperature of the laboratory shall be 20℃±2℃, the relative humidity shall be greater than 50%, the temperature of the curing room shall be 20℃±1℃, and the relative humidity of the curing room shall not be less than 90%; When the test piece of low-temperature sleeve grouting material is formed, the temperature of the laboratory shall be -5℃±2℃, and the temperature of the curing room shall be-5℃±1℃.
◆Fluidity
The fluidity test of normal temperature sleeve grouting material shall be carried out according to the above table by standard conditions; The fluidity test of low temperature sleeve grouting material shall be carried out under the conditions of -5℃±2℃ and 8℃±2℃ respectively according to the above table.
◆Compressive strength See the above technical indexes for the compressive strength test. ◆Vertical expansion rate See the above technical indexes for the vertical expansion rate test.
The prefabricated special base slurry is a dry mixture composed of cement as the basic material and fine aggregate, concrete admixture and other materials. After mixing with water, it has thixotropy, early strength, high strength and other properties. It is used for joint filling of precast concrete components by slurry setting method. Referred to as "seat slurry".
Scope of application
It is applicable to the grouting construction of precast concrete beams, columns, shear walls and other components, the sealing of precast component joints, the grouting installation of equipment cushion blocks (fabrication of grouting piers), etc.
Product features
◆Good plasticity after mixing with water
◆Early strength, high strength and micro expansion
◆Good water retention
| Testing items | Type I | Technical index | Type II | Testing method | |
| Fluidity rate | 150~220 | Refer to appendix A | |||
| Water retention rate (%) | ≥88 | Follow the provisions of JGJ /T70 | |||
| Setting time (min) | 60~240 | Follow the provisions of JGJ /T70 | |||
| Compressive strength (MPa) | 1d | ≥20 | ≥30 | Refer to appendix B | |
| 3d | ≥35 | ≥50 | |||
| 28d | ≥60 | ≥80 | |||
| Vertical expansion rate (%) | 24h | 0.02~0.3 | Refer to appendix C | ||
| Chloride ion (%) | ≤0.03 | Follow the provisions of GB /T8077 | |||
| Note 1: class I base slurry should be selected for slurry setting construction of fabricated concrete building works, and class II base slurry should be selected for slurry setting construction of precast assembled pier and abutment and high-rise fabricated concrete building works | |||||
Packaging and storage
20kg/barrel, the original sealed product is stored in a dry and cool environment, and the shelf life of the product is 12 months.
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