Poor execution of the floor slab?

Good morning everyone,

first, some general information:

- Bad Segeberg, Schleswig-Holstein
- Timber frame construction + clinker facade
- KfW40+
- Ground slab 130 sqm - 25 cm waterproof concrete, strip foundation 90 cm, 12 cm perimeter insulation

There is probably still some information missing, I will provide it later

Last week, starting Monday, our ground slab was made, planned completion Wednesday. On Tuesday, due to a torn foil over the strip foundation, concrete apparently came up. This was corrected accordingly and preparations for the actual slab continued, but we were already told that there would no longer be enough time and the ground slab would be poured on Monday (25.05.2020).

This also happened in the morning, my father-in-law was on site and was able to somewhat observe the work while he was busy digging the soakaway pits. When I went to the construction site yesterday afternoon to check the result, I was somewhat negatively surprised. Now, I am not an expert but to me the ground slab looks poorly done and the occasional gravel pockets (I did not photograph all) do suggest that the compaction was not done thoroughly, right? The guys were/are actually scheduled for a construction site in Bielefeld and left immediately when they finished, so I also suspect time pressure here, overall they were on site for just over 2 hours.

I can gladly provide more pictures this evening, I am only interested in an initial opinion. The construction manager will come tomorrow for the acceptance.

Thanks in advance!

Beautiful is different. The base slab will still work.

Thank you for the feedback, then I am a bit more reassured and it is merely somewhat sloppy work. Our acquaintance is an expert, he had now advised against an acceptance solely based on the pictures. He may perhaps also be a bit overcautious, I cannot assess that 100%.

Clean work...

Can you check if the DIN is being adhered to? (I hope I quoted the correct part)

Angular Tolerances
Limit values for angular deviations apply, just like all other dimensional tolerances according to DIN 18202, both for the concrete components themselves and for the position of in-situ concrete components and the installation of precast concrete parts. In the surface of concrete components, according to DIN 18202, the angular deviation is not to be checked, but only the flatness of the surface.
Limit values for angular deviations are described by spot measurements. For example, for a nominal dimension > 1 = 3 m, such as a typical wall or column height or a beam with a span in this range according to Table 2 of DIN 18202, the spot measurement as a limit value may be up to 8 mm, for a corresponding nominal dimension > 3 = 6 m, 16 mm. A floor slab whose length and width each > 6 m = 15 m, may have a maximum spot measurement of 16 mm.

Hello Woboter, may I ask who you are building with? Greetings to the neighborhood

Phew, it looks really, really bad. Honestly, the worst base slab I have seen so far. And there have been many. The main question for me is whether watertightness is even guaranteed here. WU concrete is useless if it is processed incorrectly. And that's exactly what it looks like to me here. You will never get access to it again, and if it were to leak, you'd have a serious problem.