Crack in Ground Beam

Looks like a common settling crack, grind it out, patch it up....

I agree with SolarEagle, as it appears to be a settlement-induced crack.

Rout it out as far as you can. I recommend at least 2-inches minimum rout depth, unless the rebar interferes with the depth cut.

Use a cementiuous-based epoxy compound.

You will be doing this time and again until the long-term settlement of the foundation subsides.....

Currently, it's just an eyesore, but left as is the cracking will most likely widen.

Good luck with your repairs!

Have you had any tremors, (earthquakes)?

no earthquake.it's a new building. from the look of the horizontal crack,is it possible it is caused by cold joint?poor workmanship?

the ground there has high soil bearing value.so im not quite sure it is because of ground settling.is it?

Even if the underlying soil has a high bearing capacity, it may have been disturbed enough by the Contractor prior to the concrete foundation being placed to promote settlement. Also, if the Contractor had over-cut the insitu soil material(s) and laid down a subbase of gravel, etc. and didn't compact that layer sufficiently prior to placing the concrete, then settlement will likely occur.

Nearly all soils will compact no matter how well they are prepared (compacted), especially under heavy loads such as those imparted by reinforced concrete buildings. Typically, a minimum targeted 95% Proctor Density for compacted soil is utilized under structural foundations. That means, basically in layman's terms, that if you have 100-inch thickness of a certain granular soil (say a subbase) then you can expect at least an additional 5% consolidation (short and long term, depending on the underlying soil type, including groundwater influence) of that material......roughly 5-inches of settlement!

I think its just the crack in the plaster, can u investigate its depth by any means?