Then when later the subsequent shrinkage to original volume may actually result in height shrinkage. I envision that especially if the base plate is stout, and the equipment is heavy, The vertical expansion is restrained during the expansion phase and the grout will plastically "upset" outward. The frequently mentioned ASTM C827 says this about itself - "However, the specimen used in this test method is not completely unrestrained so that the measurements are primarily useful for comparative purposes rather than as absolute values." The expansion curve of many "non-shrink" grouts includes a some pretty severe early expansion (up to at least 4%, or over 1/16" for a 2" inch thick space) followed by shrinking to close to original size. If the under plate nuts are left in place, when the top nuts are tightened they do not clamp the base against the grout. And hard shimming in place of the under-plate leveling nuts.
#Worktime with self leveling grout plus
That requires flowable grout, plus millwrights with experience and integrity, and base plates designed to facilitate complete filling. Structural base plates, and especially rotating machinery base plates and bed plates require 100% filling and support. The American Concrete Institute even reports dry-packing operations require nearly constant inspection to ensure that the proper layer thickness and compactive effort are being used. Dry-packing requires an almost unobstructed space and must be installed by skilled workers. That is due to the difficulties in achieving I'd say dry-pack used on/under "structural" base plates is best only used when expectations are aesthetic and a modicum of sealing. The firm I work for always calls out leveling nuts.ĮIT RE: Non-Shrink grout and leveling nuts SwinnyGG (Mechanical) 20 Jun 16 20:55 Then we tapped the plate down until it was at the correct elevation and level. How do you make sure that the plate gets solid bearing on grout? I used to work as a carpenter and we always used leveling plates on a thick bed of grout. I have never seen or heard of a "flowable" non-shrink grout or a pencil vibrator for that matter. I feel bad and I think it will be next to impossible to remove the existing grout.įYI, the vertical forces are in the neighborhood of 110 kips service load.ġ. They also told me to include in my report that the grout shall be removed and new "flowable" grout installed. When I brought my concerns to the attention of my superior, the E.O.R., they said that it should have been a "flowable" non-shrink grout installed with a pencil vibrator. The only access for the dude installing the grout was pretty much from the vertical direction with only a couple inches of horizontal movement for his trowel. The access to these base plates is also severely hindered by the surrounding slab-on-grade.
I am questioning how big of a void is under the base plates (18"x18" plates). Stamp Overlay MixAllows 2 to 6 hours of working time for stamping and carving. Contact CMP for product extension recommendations when thickness exceeds maximum neat placement allowable.How do you all specify the application of non-shrink grout under steel column base plates when the steel was erected utilizing leveling nuts? I observed the contractor "packing" the grout in with a mason's trowel. Using a polishable self-leveling concrete overlay is an excellent option. The Coverage Calculator provides a net number, it is advisable to estimate an additional 10% for waste and variations.
Ideal for health care environments – Will not support the growth of mold or mildew.Compatible with all adhesives approved for concrete.Fast return to service walkable in just 2-3 hours.Maintains healing and pour merging properties for up to 25 minutes.Can be installed from 1/4″ – 3″ Neat and to 5″ properly extended.Can be left open to normal construction traffic for up to 12 months.Ideal for barrel mixing or pumping applications.Level-1™ produces a hard durable surface that can be left open to normal construction traffic for up to one year before the installation of finished flooring and it can be feather-edged to meet existing transitions. Its extended working time, low shrinkage and superior leveling properties make it the ideal product for renovation and new construction projects where next day flooring installations are not critical. Level-1™ is a cement based, interior, self leveling underlayment that can be used to create a smooth, flat or level surface prior to the installation of floor coverings.
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