Re: Grout under a steel column plate. The purpose of grout is to ensure that the base plate makes good contact with the concrete over its entire area. The thickness of grout needs to be only as thick as you require for placing it.
What is the purpose of grout under steel columns?
Why is there grout under steel columns? Concrete grout is used in most column base connections to facilitate the construction process and to ensure that full contact is achieved between the steel plate and the concrete pedestal. Click to see full answer. Likewise, people ask, what is the purpose of grout under base plates?
How thick should Grout be under steel column plate?
Re: Grout under a steel column plate. The purpose of grout is to ensure that the base plate makes good contact with the concrete over its entire area. The thickness of grout needs to be only as thick as you require for placing it. Probably one inch would be about right in your case.
Why is it important to select the right grout material?
Selecting the right grout material and using the correct placement technique is critical to machine alignment, integrity, and longevity. Furthermore, is grout required under base plates?
What is the purpose of the grout on the base plate?
The grout allows a little play in the as-cast foundation height as gives you space for leveling. On exterior base plates the grout keeps water from sitting in the plate/pier joint.
Why do you grout steel base plates?
What Is the Purpose of Grout Under Base Plates? Grout acts like a liquid shim between two surfaces and is used to secure the base plates of heavy machinery to the foundation which allows the machinery to function properly.
What is grout in steel structure?
Grout is a composite material generally consisting of water, cement, and sand. It is typically used for filling voids under machines or other structural elements, sealing joints and openings in surfaces and reinforcing existing structures.
What is structural grout used for?
Structural grout is often used in reinforced masonry to fill voids in masonry housing reinforcing steel, securing the steel in place and bonding it to the masonry.
Why do you grout pump bases?
In addition to strength and stiffness, grouting locks the pump base to the foundation, making it heavier. This helps maintain the shaft-to-shaft alignment, reducing wear on the moving parts. Proper alignment minimizes wear on parts, which helps reduce the repair cost down the road for the end user.
Is grout as strong as concrete?
Concrete and grout typically similar in strength, with the exception of the instance that of Ultra-High Performance Concrete, which is a new product and is 10 times as strong than traditional grout or concrete. Concrete has a higher compression strength (7,500 psi) than grout (5,000 psi).
How do you grout under steel columns?
grouting underneath steelwork and steel baseplatesStep 0 - Shims used to temporarily level baseplate & steelwork.Step 1 - create a formwork around the baseplate. ... step 2 - use a hopper and pour in the grout. ... Step 3 - Wait for non-shrink grout to go off then remove formwork. ... step 4 - chamfer off corners on exposed edges.
How strong is structural grout?
Typical compressive strength values are 8,000 psi to 14,000 psi at 28 days, with 1 day strengths in excess of 3,000 psi.
What is grouting in building maintenance?
Grouting in civil engineering refers to the injection of pumpable materials into a soil or rock formation to change its physical characteristics. Grout may also be used in the formation of pile foundations, ground anchors, under-reaming, underpinning, in road construction, dam construction, and other applications.
What is pump grout?
Grout pumps can be used to fill small voids and door jams and they are available in either manual, electric, gas, hydraulic and air powered. Concrete pumps are strong enough to lift up many stories and even lift slabs of concrete.
How do you grout under equipment?
0:053:32How to Create a Deep Pour Grout under Base Plates with Belzona 7211YouTubeStart of suggested clipEnd of suggested clipFirst we clean the base plate and application area with the wire brush to remove any dirt grease orMoreFirst we clean the base plate and application area with the wire brush to remove any dirt grease or loose surface material. We then decrease the base plate and application area with those ona 9111.
What is epoxy grouting?
Unlike cement grout which is made from a cementitious powder mix , epoxy grout is made from epoxy resins and a filler powder. Epoxy grout is extremely durable and almost completely stain proof. Regular cement grout is not waterproof, so unlike epoxy grout , it can absorb water when wet and stain easily.
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Re: Grout under a steel column plate
The purpose of grout is to ensure that the base plate makes good contact with the concrete over its entire area. The thickness of grout needs to be only as thick as you require for placing it. Probably one inch would be about right in your case. It should be high strength expanding (non-shrink) grout similar to the product shown here.
Re: Grout under a steel column plate
Good afternoon ba/ael, thx for your post. I changed my spec to 1" of grout. Called for leveling nuts under the plate. Kept the 1/4" plate thickness, because your assumption about minimal moments is correct.
Re: Grout under a steel column plate
You can do it that way if you wish, but I would prefer to install the column in one piece. The contractor places the column, snugs it up to the underside of beam, connects column to beam then places grout under the baseplate and waits a couple of days until it cures.
Re: Grout under a steel column plate
Good evening ba/ael, I like your way better, but with cast-in-place anchor bolts I don't see how it'd work. If there's 7'-6" between the beam and the footing, and you subtract the one inch of grout, the column weldment would be 7'-5" long, but with 2" of anchor bolt protruding, you might not be able to get it in place over the bolts.
Re: Grout under a steel column plate
Yes, if the anchor bolts are cast-in-place, they will get in the way of placing the column. Probably the best solution is to drill and epoxy the bolts in place after the column has been plumbed. If they are going into new concrete, drilling is not difficult.
Re: Grout under a steel column plate
Good morning, ba/ael, now I'm thinking a good way would be to cast in place the 2 far anchor bolts. Slot the base plate for these two bolts and swing the column into place. Mate the column firmly under the beam, plumb it, bolt it.
What is grout in concrete?
Grout makes up for any discrepancy in elevation and flatness in the concrete. It fills the void to provide precise and level bearing for the column. Try building a form around the column and pouring premixed pourable grout from one side. When it builds up to the same level on the other side, it's full.
What happens if grout doesn't carry the load?
Hopefully - and usually it really does happens - the grout is stuffed far enough under the plate and with enough pressure so enough grout connects top-of-concrete and bottom-of-baseplate to carry the load. If it doesn't carry the load, you find out when the column collapses years later. Or hours later.
What happens if you choose the wrong grout?
Choosing the wrong grout can lead to failure of the bearing grout; for example, most cement grouts are not able to resist continuous impact loading such as under vibrating machinery.
Why does cement grout crack?
Cement grouts rely on expansion to provide the non-shrink properties required of a precision bearing grout. This expansion needs to be confined under the baseplate, but if allowed to expand freely, the grout may crack due to shrinkage. This cracking is often seen where a cement grout has not been finished properly.
What is peristaltic grout pump?
A peristaltic pump is used for resin grouts and a diaphragm or worm pump for cement grouts. Alternatively, for large grouting areas, a grout lance is placed through the gap to the other side and withdrawn slowly as pumping proceeds.
What is grout EBA?
The support provided by a grout is the Effective Bearing Area (EBA). This can be affected by grout leakage, unlevel plate, shrinkage of grout, inadequate mixing of grout, wrong placement method, poor grout flow or entrapped air voids. EBA can lead to point loading on the grout which in turn can result in cracking and crumbling of the grout under the baseplate. This could have disastrous consequences on the machine.
How high should a grout hopper be?
The hopper must be a minimum height of 100mm and have a ratio of 1:3 (height of hopper: length of pour).
Does grout flow under baseplate?
Grout not flowing under the baseplate. Rapid installation of machinery is essential. A grout with poor flow will slow down the process. Some inferior epoxy grouts are cut back with diluents to improve flow, but this can lead to excess shrinkage and loss of EBA.
Why do independent shims need to be welded?
Independent shims must have a reasonable aspect ratio to prevent instability of the stack. In some instances shim stacks are tack welded to maintain the integrity of the stacks. When shim stacks are used, care must be taken to ensure that the stacks cannot topple, shift or become dislodged until grouting.
Do you grout columns before placing concrete on a metal deck?
Also, it is likely that the column bases would have to be grouted prior to placing concrete on metal floor deck. Properly installed shim stacks can support significant vertical load. There are two types of shims: those placed on (washer) or around (horseshoe) the anchor rods.
Do you need shims on grout?
From a construction standpoint, those shims or leveling nuts hold the load while the grout cures. Their presence after the grout is structural and does not reduce strength.
