In the more evolved continued mixing technique, the two liquid adherent details are handed through an automated mixing head behind the pumping simply before exiting the gun. Injection grouting method permits fast-setting cement with short working energy. After the injected epoxy has been fixed, the established part of the consistency seal is removed by rubbing or other appropriate means.
Grouting Procedures
- Drill Ports
Drill short spots, also comprehended as ports, into the cracks/ spaces to be employed as key and venting terminals. The minimum diameter and deep of ports are 2.5cm and 5cm, respectively. Spacing between holes is 150 mm c/c for finer damages to 300 mm c/c for others. The spacing of dockyards is usually kept more significant than the expected depth of grout penetration, but it may be modified based on assessment and conditions for a particular project.
- Seal Cracks Between Ports
The crack /opening covers between ports are closed by applying epoxy, polyester, strippable plastic surface sealer for low injection pressures, or cementitious monograms if surface appearance is important to the surface of the crack. The time needed for developing the seal depends upon the kind of material used. The cracks are usually routed 6 mm in width and 13 mm in depth to strengthen the exterior seal. Occasionally, the damage can be cut out to a depth of 13 mm and width of about 20 mm in a V-shape, which is then sealed with epoxy to wash the surface.
- Cleaning Ports and Cracks
Before grouting, flushing is done with pure water to achieve the following objectives:
- Wet the interior surfaces for more suitable grout flow and penetration.
- To review the effectiveness of the surface sealing and port design.
- To gather details on grout flow patterns and points of interconnections of voids/discontinuities in the mass.
- To introduce the injection grouting crew to the situation.
Full damage cleaning may not be possible in realistic situations, and an assessment must be used to determine the size of this cleaning.
- Make Grouting Hose Connections
When the ports are prepared after sealing the entrances, and the grout pressure is up to 350 kPa, a hand-held, cone-shaped fitting on the grout hose is acceptable. Short pipe nipples are attached to the holes for more extensive grout stresses to obtain grout hose connections. The procedure for establishing entry and vent ports in case of V-grooving of the cracks is to drill holes 20 mm in diameter and 13 to 25 mm deep below the groove at the necessary spacing. A pipe nipple or tire valve stem is connected with an epoxy adhesive.
- Grouting Process
Grouting is formed at one end of a horizontal space or the bottom of a vertical space. It is continued until grout arises at the next port or the surface seals of cracks bulge out, after which the grouting operation is transferred to the next port.The port valves from where the grout reaches out are sealed before moving to the next injection site. Injection Grouting is usually created with moderately thin grout, thickened as fast as feasible to the heaviest surface that can be pumped without backup.Excessive alert must be exercised when injecting cracks that are not visible on all surfaces. Guns are commonly utilized for the injection of epoxy, hydraulic pumps, paint pressure pots, or air-actuated caulking.
- End of Grouting Process
Full filling of the crack shows that the force does not drop. The epoxy injection needs a high degree of skill to use the technique successfully. The atmospheric temperature at the restoration site is also an essential consideration.
