Cracks in the area of inserts.
Cracks in the area of inserts.
(OP)
Columns have been already situated on building place. Columns have got three inserts along those lenght. On columns, in the area od inserts I noticed cracks, which was shown in enclosed pictures.
The question is - Is this type of cracks a result of thermal action (in steel and concrete) from sunny weather?
The question is - Is this type of cracks a result of thermal action (in steel and concrete) from sunny weather?






RE: Cracks in the area of inserts.
RE: Cracks in the area of inserts.
If this is the case, the metal strut will rise to a higher temperature than the concrete, and expand linearly and push upon the column. Those forces must be tremendously high before they will cause a crack. Conversely, if the temperatures drop and the metal shrinks away, you can get a crack at fairly low changes in length.
You say you are wondering about sunny days; I would wonder about cold nights! How much play (ie: space) is present between the angle and strut at the connection? How long is the strut?
More photos, more information, please. An overall shot would be very useful! Hopefully someone can help you out...
Cheers,
YS
B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...
RE: Cracks in the area of inserts.
Any construction history on the location?
What steel is in the column and insert?
How thick is the panel?
Mike McCann
MMC Engineering
RE: Cracks in the area of inserts.
Looking at the picture there could be a number of reasons like the rusting steel behind the concrete flaking.
Have a look at this link I realise its not reinforced concrete as such but it may give you some idea as to what happens when steel and concrete are in close contact
http://en.wikipedia.org/wiki/Reinforced_concrete
Another possible reason is stress raiser's at the edge of the concrete as it was originally drying, the reason I say that is there appears to be no radius on the front of the steel thats in contact with the concrete (although its difficult to tell), however towards the rear there does appear to be a radius.
desertfox
RE: Cracks in the area of inserts.
The insert is better at the center of the column and the weld could extend to the the face of the column to get the horizantal element to bolt with it.
RE: Cracks in the area of inserts.
I will be enought if we repair it using repair-mass for concrete/ epoxy injection?
ad) msquared48
Any construction history on the location? It was assembled 6 mounths ago.
What steel is in the column and insert? B 500 SP, fi 12-25
How thick is the panel? 12 mm (I mean thick of insert)
RE: Cracks in the area of inserts.
2. Plate set directly adjacent to corner chamfer, so the corner comes off easily.
3. Because of easy entry of water around the plate, corrosion initiates at sides and probably under plate, spalling results.
Thermal? I doubt it. Corrosion is the problem. Ferrous oxide occupies much more volume than steel.
RE: Cracks in the area of inserts.
I suggest you look into doing some proper repairs of this e.g. removing rust adding a corrosioon inhibitor and a bonding agent, then covering with non porous repair grout and a sealer
Doing it incorrectly will not last long
RE: Cracks in the area of inserts.
RE: Cracks in the area of inserts.
RE: Cracks in the area of inserts.
Mike McCann
MMC Engineering