Protecting concrete usually means shielding it from the elements of nature or from harsh manmade chemicals. But it’s not just concrete that needs such protection. Corrugated metal pipe, steel surfaces, material hoppers, rail cars and masonry all can come in contact with corrosive or abrasive materials or harsh conditions.
The geotechnical needs of DOTs and other agencies responsible for roads and bridges are vast. Issues include: Culvert repair Soil stabilization Void filling Concrete slab lifting Sinkhole remediation Slope control Slough control in tunneling
Injection of large defects in below-grade concrete and/or masonry structures to seal gushing or excessive water leaks.
Problem: A large crack or defect (including a failed joint) in a below-grade concrete or masonry structure that is located in a high groundwater area allows for large volume infiltration creating gushing leaks in the structure.
Locate the places where water is infiltrating the structure. In scenarios where large volumes of water are gushing through the structure, it may be necessary to temporarily dam the defect (see Activated Oakum Technique) in order to precisely identify the type of defect that is present within the structure.
In some cases the actual defect itself may not be conducive for conveying material. Once the defect has been identified, drill a 3/8” diameter hole directly into the defect for installation of the static mixer that will be used to inject material. When injecting wide cracks or joints, it is only necessary to penetrate the crack or joint until water begins leaking through your injection hole. It is not necessary to drill through the structure entirely to the exterior.
PREPARING THE CARTRIDGE SYSTEM
Prime Flex 920 is packaged in a dual 750 mL by 75 mL cartridge system (the 75mL “B” tube contains Kick Fast Kat). The cartridge requires a 10:1 ratio-capable pneumatic gun to dispense the Prime Flex 920.
INJECTING CHEMICAL GROUT
Remove empty cartridge, static mixer and retainer nut from injection gun and discard. Prime Resins recommends using Prime Plug to fill the injection holes to a depth of 1” after injection is complete.
3/8” concrete drill bit
Empty 1 – 2 gallon pails