Fuzhou grouting material is used for pouring and repairing cracks with a crack width of more than 3mm in concrete structures and steel clad reinforcement

 

1、 Material introduction

CGM polymer cement grouting material is a cement-based grouting material with high-strength cement, polycarboxylic acid superplasticizer and multi mineral materials as the main modified components
It has the characteristics of good fluidity, micro expansion, certain toughness, strong adhesion with concrete, anti-corrosion and durability, It is applicable to the pouring repair and steel clad reinforcement of cracks with a crack width of more than 3mm in concrete structures

2、 Performance index

Table 1 performance indexes of polymer cement grouting material

Serial number	Inspection items	performance index
one	Vertical expansion rate (%)	3h	& ge; zero point one zero
Difference between 4H and 3H	& ge; zero point zero two zero
two	Fluidity (mm)	Initial value	& ge; three hundred and eighty
30min retention (%)	& ge; ninety
three	Compressive strength (MPA)	3d	& ge; twenty-five
7d	& ge; thirty-five
28d	& ge; fifty-five
four	Flexural strength (MPA)	7d	& ge; five
28d	& ge; eight
five	Splitting tensile strength (MPA)	7d	& ge; three
28d	& ge; four
six	Bleeding rate (%)	0
seven	Normal tensile bond strength with concrete (MPA)	28d	& ge; 1 5, and it is concrete cohesive failure

 

3、 Construction technology

1
Pretreatment: blow out the ash and pollutants in the concrete cracks with compressed air

2
Embedding grouting pipe: one grouting pipe is embedded every 500mm along the crack length

3
Joint sealing: use inorganic fast sealing materials or seal all the crack surfaces

4
Pressure test: seal the grouting pipe, conduct water pressure or air pressure test with the pressure of 0
2 ~ 0
3MPa, and observe whether the joint is sealed , There is no water in the joint, but there is no water in the concrete surface

5
Ingredients: the quality ratio of CGM polymer cement grouting material is: polymer cement grouting material: water = 10: (2
5 ~ 2
8)
Use forced mixer or modified impact electric drill for mixing, and use after mixing evenly
The mixed slurry shall be uniform in color, free of powder, sedimentation, white material, bleeding, etc
, and its fluidity shall meet the requirements of grouting consistency
After the grouting material is prepared, it shall be used immediately to avoid solidification

6
Grouting: put the mixed grouting material into the special pressure grouting tank, and use the pressure of about 0
3MPa to inject the slurry , Continuous injection of cracks
The vertical cracks shall be grouted one by one from bottom to top, and the filled grouting nozzles shall be closed immediately
During grouting, pay attention to eliminate the air in the crack
The latter grouting pipe is an exhaust hole and shall not be blocked to avoid affecting the air discharge

7
Curing: after grouting, the grouting part shall be maintained for water curing for more than 7 days