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Special Patching Agent for Metro Shield Segment

SPECIAL PATCHING AGENT FOR METRO SHIELD SEGMENT The temporary support lining in the subway tunnel—the shield segment is made of C50 grade reinforced concrete and every five pieces form a complete ring.The corners and edges of shield segment need to be repaired due to collision in production and......

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SPECIAL PATCHING AGENT FOR METRO SHIELD SEGMENT

The temporary support lining in the subway tunnel—the shield segment is made of C50 grade reinforced concrete and every five pieces form a complete ring.The corners and edges of shield segment need to be repaired due to collision in production and transportation. But the ordinary cement mortar can not be use for the shield segment repair because of its poor bonding performance, low strength, long setting time and insufficient crack resistance. So we develop a special repair agent for subway shield segment, i.e.TS-301X. This patching agent is composed of early strength agent, water retention agent, polymer adhesive, anti-cracking fiber, lubricant and so on.


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Test basis

GB50367-2016

Test items

Index value(Grade Ⅰ)

Test result

Appearance

Uniform and no agglomeration

Uniform and no agglomeration

Initial setting time(min)Enterprise standard

≤45

38′32″

Splitting tensile strength(MPa)

≥7.0

7.5

Positive tensile bond strength with concrete(MPa)

≥2.5

2.7

Compressive strength(MPa)
Brown is the enterprise standard

24h

≥30

36.5

72h

≥40

42. 6

7d

≥50

50. 7

28d

≥55

63.3

Standard value of steel sleeve bonding shear strength (MPa)

≥12

13.3

28 days Flexural strength(MPa)

≥12

14.2

Note: 

Mix the patching agent into cement at site and stir evenly, then the mixture can be used as TS-300X .(Suggest ratio: patching agent: cement (52.5) = 1:9 )


Scope of application: 

Concrete structure where requires both high color differences and rapid repair such as subway shield segments, roads, railways, and civil buildings.


Packing and storage: 

Standard package, 25kg/bag. 

The warranty period is 6 months. Product need to be tested before use if storage time exceeds the warranty period.


Product performance

1. Early strength, high strength:

Product strength reaches up to 30Mpa in 24 hours and reaches up to 55Mpa in 28 days.

2. Good bonding performance:

The bonding strength in between the new and old concrete is more than 2.5Mpa, which can ensure the bonding strength reach to the greatest extent;

3. Good crack resistance:

The repaired part would not crack;

4. Strong resistance to water immersion:

The bonding strength in water of the repaired surface is the same as in air;

5. Convenient color matching: 

Use the on-site cement (P52.5) for repair to match the theme color.

6. Adjustable setting time: 

Adjust the setting time by changing the dosage of the agent.


Instructions

1. First take 2 kg powder material(1.8kg cement +0.2kf patching agent) and add 0.4-0.5 kg water into it, then manually stir the repair material for 0.5-1 minutes to make it into toothpaste-like material ;

2. After the base surface is cleaned, wet it with a wet towel;

3. Apply the patching material to the defect and smooth the defected area;

4. After the repair material is hardened, rinse the water twice in one day and avoid the sun exposure;

5. Since the curing time of this patching material is short, each time mixing amount should not be too much and better be used up within half an hour;

6. Water consumption: 20%-25%.


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