Expansion joint castable

expansion jointCastable material, also known as high polymer rapid structural repair material,It is a super early strength concrete structure repair material formulated with cement as the basic binder, cement as the main aggregate, supplemented with high molecular weight rubber powder, water reducer, early strength agent, expansion agent, anti segregation and other substances.expansion jointcastable refractoryHas good self flow, fast hardening, early strength, no shrinkage, and slight expansion; It is a super early strength concrete structure repair material developed for the characteristics of concrete structure damage, such as harmless, chemical, water quality and surrounding environment, good self tightness, rust resistance, etc.

1、 Scope of application                                                                       

1. Quick repair of broken cement concrete pavement slabs.

2. Rapid repair of severely damaged areas in concrete structures.

3. Bridge expansion joint pouring material

2、 Material characteristics                                                                       

Ultra early strength: With high early strength, it can meet the requirements of rapid repair of concrete structures.

Non shrinkage: Expansion agent is added to the repair material to prevent it from losing water and shrinking.

Durability: It belongs to inorganic mixtures, resistant to corrosion and aging.

Environmental protection: harmless, non corrosive to steel bars, harmful to water quality and surrounding environment.

3、 Performance indicators                                                                       

4、 Construction technology:clean up→ Base surface infiltration → Interface treatment → Formwork support → Mixing → Pouring → Curing

1. ClearReason: For cement concrete pavement broken boards or severely damaged parts of concrete structures, use a pneumatic pick to break the broken board into small pieces and remove them. Remove loose materials from the surrounding board base surface, and use an air compressor to blow away dust from the base surface and groove.

2.Base surface infiltration: before pouringWet the base surface with water and remove any visible water within 2-3 hours; During winter construction, the base surface should be thoroughly moistened with warm water not exceeding 65 ℃ and any visible water should be removed before pouring.

3.Interface treatment: Apply a layer of interface agent evenly on the base surface.

4.Formwork: For the cement concrete pavement slab located in the center of the road to be repaired, the surrounding slab edges can be used as templates; For cement concrete pavement panels located at the edge of the road that need to be repaired, the three edges can be used as templates with the surrounding panel edges. Wooden or steel molds should be erected at the edges, and leak proof measures should be taken.

5. Mixing：mixThe water volume is16 ± 1%. Based on the actual repair area and repair speedcastable refractoryIntroduce mandatory mortarstir, StirAfter 10 seconds, add the specified amount of water in two separate portionsstir: First addition2/3 water,stir30s; add the remaining 1/3 water twice,stir150s. Winter construction should use a temperature not exceeding 65 ℃Wenwaterstir, StirThe material temperature should be withinAbove 10 ℃.

6.Pouring: Use a pouring container to pour slowly and uniformly, and avoid hollowing during pouring. After pouring, smooth the top of the repair material. Every time it is mixedpourThe time from the start of mixing to the end of repair shall not exceed30min。 Repair materials that exceed the time limit or do not meet the construction requirements for workability shall not be used again.

7.raiseprotectCover the top surface of the repair material with a plastic strip, and then completely cover it with a straw bag to keep it moist. At room temperature,The curing can be ended after 3-4 hours, or it can be decided whether to end the curing based on the structural strength requirements and the strength test results of the reserved specimens. Insulation measures should be taken in winter, and the curing time should be appropriately extended.

5、 Precautions                                                                       

1、castable refractoryDrinking water is recommended for mixing.

2、castable refractorySuitable water usage should be selected according to product requirements to control slump and slump expansion.

3. The template used for repairing bridge structures should be a brand new template to achieve a beautiful appearance after demoulding.

4. After construction, the equipment should be promptly cleaned with water for future use.

5. During on-site use, it is strictly prohibited to add any admixtures or external additives to the materials.

6、 Packaging and storage                                                                       

1. Expansion joint castableUsing composite moisture-proof bags for packaging,25Kg/bag.

2.The effective storage period from the date of production is6 months.

3.It should be stored in a cool, dry, and ventilated warehouse, and should not be exposed to sunlight or rain.