A couple of other pieces of information will be useful:

What is the overall size of the slab? Are their any construction joints
in it or is it one monolithic piece?

Dan

> -----Original Message-----
> From: B-P Golden Oldies: "Authentic Replicants Converge" 
> [mailto:[log in to unmask]] On Behalf Of 
> [log in to unmask]
> Sent: Thursday, July 13, 2006 9:10 AM
> To: [log in to unmask]
> Subject: [BP] Fwd: [BP] Concrete Epoxy Repair
> 
> 
> To All CONCRETE Repair Experts,
>  
> In an attempt to address interspersed thoughts and questions. 
>  The slab in question is about 8 months old.  The control 
> joints have not been cut at all yet.  Neither the slab nor 
> the non-existent joints have been sealed.  There is still not 
> any perimeter drainage in place.  The slab is 6" thick with 
> approx 4" below grade.  There is heavy gauge 6" reinforcing 
> mat set on cinder block bricks with radiant heating pipes 
> tied to it.  The pipes are pex-al-pex meaning plastic 
> extruded over aluminum inside and out.  The concrete is 
> poured over Barrier brand insulation which is high density 
> eps foam with poly on either side and is, in theory, a vapor 
> barrier.  There is no indication of water infiltration in the 
> concrete.  No wet spots at crack or anywhere else.  I intend 
> to cut control joints between the piers on which the building 
> trusses sit.  They are located on 12' centers in a 48' 
> structure.  Also intend to cut control joints longitudinally 
> to divide slab into 3 section across the 30' width.  These 
> joints all connect piers for structural posts which are 
> isolated from the slab by the same insulation, but cause the 
> slab to have nasty inside corners cast into it.  The single 
> crack goes from one post at the mid point of the building 
> length to the corresponding post pier on the other side.  It 
> winds several feet off course in the middle of the floor.  
> The crack is about 1.5 mm on the one end and narrows to a 
> closed but visible crack in about 6 feet.  It showed up all 
> at once the day after turning some heavy timbers which were 
> on stickers on the floor.  I could feel the vibration from 
> the timbers slamming about 100' away in the separate office 
> building.  There is a set of pipes and conduit coming in 
> under the slab right next to the post at the wide end of the 
> crack which may have provided a route for water under the 
> slab.  The shop is used fro timber work ad the principal 
> contaminate is sawdust  I think the crack is pretty clean so 
> far, but I would like to do what I can to stabilize it ASAP.  
> My concern is fro the well being of the pipes , as they 
> cannot take heaving and cycling if they are not sleeved.  The 
> crack in the slab itself is of little or no concern as my 
> work will not abuse the concrete in general as long as I get 
> the drainage issue addressed.  Even a full load of timbers 
> would only be 20 to 30 tons spread over most of the floor.  
> Again, I feel that I can probably drill holes as deep as 1'" 
> to 1 1/2" relatively safely if that is necessary.  I hope 
> that addresses all of the major variables. 
>  
> Thanks,
>  
> David J. Dauerty
> To The Line Timber Frames  
> 


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