True but special materials/additives are used against time, for example concrete/cement reaches near-peak performance 28 days after being dried/cured, it can be worked on after 7 days (if workers cure it well after it starts "sweating" the hot water), now the thing is some companies or situations don't have 7 days so they use special additives to cut time and thus all the lateral costs like insurance, machinery and such.
In domestic civilian cases it usually helps with the payment of workers, for example having 3 dudes taking care of a concrete roof or cement floor for 7 days can be cut down to even 2 days only if you add a strong drying chemical, that's a good chunk of savings although if the construction boss is a jew/dumb he will have the workers do nothing or very little for the next 5 days so you get charged more for the same thing.
The trick with cutting time is using the savings to work other stuff like walling or detailing curbs and such, this taking into consideration they won't have to detail the concrete/cement thing because, for example, a cement floor without any additives will take a while to dry but the sweating of the hot water and dusty particles can be used to create a natural polish which can be also painted and extra polished with acid, that detailing cannot be done with added chemicals; if they decide to not use then they will have to remove that excess liquid.
As a side note, just like bricklaying, the art of polishing cement is being lost because construction workers are some of the most retarded members of society, they are hard working no doubt but they forget techniques and do not care at all to nurture themselves with knowledge; as long as something can be done quicker and without breaking their backs they will use it, and the construction masters who rather hide those cheap details with expensive masonry or wood rather than use the well-worked structural material itself as ornament.
>at least 100 square meters of space taken up by building material
That's really not much for construction, it is a big house for a civilian and probably would need 3 dudes working on it if most of it has air surface (aka floors or roofs) now imagine cutting down half the wages of 3 or 4 guys if you dare to pay for a couple of bottles of drying material. Even small-sized grinded gravel can work wonders with time in things like columns or beams, you shouldn't support something on top of those until 7 days have passed but small-gravel makes it stronger and you can put shit over it after 4 or 5 days.
Some croatian anon posted very good info time ago in i don't remember well, i think it was /fascism/, he had good experience in the construction area and had a better idea around time and costs. The biggest enemy in construction costs is time... and the client trying to jew the structural costs and cheaping out on materials.
>giant inflatable bladder serves as the support for a formed pour of concrete onto it
I think you can save more money using shot concrete than pouring the cream on top, also it depends on the dome: There's thick and or irregular domes that need a strong rebar structure and then there's ultra-thin domes on catenary forces that need retarded amounts of beams and top-tier workers to build those.
For example a rebar hemisphere can have some concrete poured into it but shot concrete, as in a high-pressurized hoses that splurts cement, is much more effective as it can save time and material but it needs the machinery and someone who knows what they are doing, nowadays they can be found small enough and most concrete workers know how to use it or know someone who does so you will almost always save money hiring a shooter and fixing a thin rebar than planning a perfect structure and finding a bunch of dudes who are not dumb and also are masters of jenga... only for the thing to be taken down after 14 days.