Lightweight concrete and heavyweight concrete

[evoline]

Hello,

When and where is hard concrete used, where you need to use a rotary hammer to drill a small hole and a hammer drill is not sufficient?
Is it only in newer buildings, if so from which year?
Is it used both on ceilings and walls or just one?

Thanks in advance

 

[MathiasS]

The Romans did start using concrete, and here in Sweden, it gained momentum in the 19th century?

You find it in all parts of buildings from all times.

 

[krenr09]

I'm guessing the 60s with prefab cast houses in the million program. Apartments from the 50s are usually brick/plastered and easier to drill into. But it can probably vary quite a bit. Sometimes some load-bearing walls are concrete while non-load-bearing walls are brick, etc. But concrete is an old technique as mentioned.

 

[evoline]

So there is no standard for it.
Thank you for the answers.

 

[C.Lundin]

Hard concrete is used on e.g. industrial floors and similar surfaces where there is a risk of heavy surface wear. Ordinary concrete, on the other hand, has been used in most other constructions since the 1950s in Sweden and, as mentioned, has been used for a couple of thousand years with successful results. Light concrete is a new phenomenon that should not be associated with the aforementioned at all.