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Do not use sand. It will wash out on top of concrete use crushed limestone as a base. Intrusion Prepakt /marineconcrete.com

In cases like this I suggest filling the hole with a large grout bag and pumping it full with grout to support the foundation. The grout bag will contain the mix and provide support. If you do not use a bag the mix will flow into all cavities and could plug drain pipes or just keep on flowing...

We have done some permeation grouting with micro-fine grout that flows in cracks like water and sets up.This was to seal leaks around concrete pump structures on river dikes . This will work but its not a low cost process. Intrusion Prepakt /marineconcrete.com

L ooks like they are grouting constantly and the grout is being washed out. Does anyone have any info on what the Italian engineers are proposing to do. Intrusion Prepakt /marineconcrete.com

Use Fabriform grout bags to contain the concrete without polluting he water. Intrusion Prepakt /marineconcrete.com

Grout pressure at the pump is not the same as the pressure at the end of the grout tube it can drop by 75% or more depending on length. Specifying grout pressures is pointless. Grout voids at whatever pressure you think is working its all a matter of the site. Intrusion Prepakt /marineconcrete.com

As you grout you will get pressure spikes. I would say about 50 PSI should be more than reasonable but it will often spike above .Often when you are pumping the pressure will be minimal, depends on the depth and head required. Generally you pump until the grout reaches the surface again.It may...

Grouting large voids underground. You have two major problems. How big is the void and where does the void stop .It may be connected to other voids, usually impossible to tell.The volume of grout needed can be unknown. Is water flowing and how fast. If it is flowing at any more than a crawl...

You can drill into the underlying soil in a regular pattern and compaction grout. This will strengthen the soil base and force the soil up to support the slab in a more consistent manner. This will be a much more expensive project than mud jacking. Mud-jacking is always a compromise as it...

You could place a fabriform filter mat behind the wall .It will permit water to pass but stops all fines. Grouting is also possible. You could fill behind the wall with clear crush and grout the material from the bottom up. You would need also grout tubes installed in the material to permit...

Fabriform concrete mats might be allowed as erosion control.They are not used frequently in BC but BC hydro has occasionally installed fabriform downstreem from their dams. Intrusion Prepakt /marineconcrete.com

I asked around and the answer I received is below. This definitely sounds like an "Oil Well" type of Cementing product, which is available It will require some "Lab work" using a GEL Strength Tester (which is able to test cement slurries at temperatures up to 400°F/204°C and pressures as high...

The only way to evaluate is to drill some test holes. Grouting is not amenable to accurate estimating of quantities required. You try it, see whats working. If your using too much material change grouts, add expanders change methods . You have to decide on the job whats appropriate as you...

Stay away from sand if possible . If there is any slope it will wash out. You could use any size of aggregate to fill the voids or several different size aggregates then grout. If small aggregate is used you will need grout tubes installed and you will pump from the bottom up. If large...

it may be possible to use a metal mesh and a fabriform bag as a form. Just pour concrete normally into the bag. Its an easier method to carry out this type of repair. Works perfectly underwater. If you need a joint use two bags. Intrusion Prepakt /marineconcrete.com

You need to grout any voids and do permeation grouting to the ground around the dam. Not cheap, and probably too expensive for this small a dam. Intrusion Prepakt /marineconcrete.com

You can pour concrete into a fabriform bag and the top will be reasonably smooth . the bag will also accomodate and flow into any large holes below the concrete. To fill deeper narrow holes you will need to use a grout tube and grout through the bags after the bags have been filled, Anchoring...

Mats can be made to any size. Usually sections sizes are multiples of 2.8M or so thats based on a loom width. Section size is usually based on how much concrete the divers are able to pour each time . Normally mat design is based on site drawings . Mats are mostly custom made for the project...

You can use Nylon articulated fabriform concrete mats, provided there is good clearance below the props. The mats also come in various polys but these are much weaker in strength and more subject to sunlight degradation. They come in thicknesses from 4 " to 20 ". The more prop wash, the...

You can use a fabriform concrete mat and colour as necessary to blend into the background. We have done this for a large 14th century heritage bridge where the foundations were exposed at low tide and we did not want to clash with the old structure. Intrusion Prepakt /marineconcrete.com