Convert loose fill into bound fill using wallpaper paste?

Many thanks to nordanney and superzapp

I also pour water into the cement-bound aggregate from the hardware store and stir everything into a moist paste. The water must first evaporate here as well before the next layer is applied. There are also no miraculous additives here that ensure uniform drying of the top and bottom layers.

The crime scene is the upper floor and we have all half-timbered construction. So it is well ventilated, and I also have time to wait. Since I have already completed a similar project many years ago, creating a lightweight concrete ceiling by binding Styrofoam beads/bean bag fillings with cement (which was very successful and which I could alternatively do again here), I have no fear or anything similar with this new project, but rather I am mostly anticipating a new positive AHA effect.

I would have only sprayed everything with hairspray anyway; where else should the granulate go after the ceiling is closed? It will retain its intended property 100% and thereby fully fulfill its purpose. If everything is dry and no deformation is observed, one can certainly sincerely argue that innovative endeavors are still almost always rewarded nowadays.

Thanks to all the users following along

Again about the costs... how much does the wallpaper paste cost you in total, how much do you need for the 10,000 L of filling? Just make a wheelbarrow full of this mixture... I want to know now too.

By the way, I once read a tip for stone carpets DIY... To try it out, you should just mash the pebbles with wallpaper paste and practice, practice, practice the processing first... Then wash it out again and only then work with the real chemicals. I liked that tip..

Oh... pebble carpet is of course a hit! There is also glass granulate in many colors, under the application you then lay high-quality waterproof LED strips and the floor or the stairs then glow from the inside. Just google and be amazed.

It will still take a little while before my first attempt starts, but I think the adhesive consumption will not be excessively high, because the stuff initially swells enormously and with only slight wetting of the aggregate, the consumption remains limited. I have already found offers at €3 per kg of dry powder, 1kg dissolved in water already yields quite a lot...

I also pour water into the cement-bound loose fill from the hardware store and stir everything into a moist paste. Here, the water likewise has to come out again before the next layer is added.

Cement sets, it’s a chemical reaction.
In paste, drying indeed has to take place to get rid of the moisture.

Does paste actually dry completely through at the desired thickness?

Is the final product of your dried paste really comparable in properties to a bound loose fill, at least in the relevant properties?

Why don’t you just pour sand on it? Much cheaper, fills the gap, can be compacted and smoothed out.

Just the thought of mixing 10m³ of bulk material in a bucket gives me sore arms. Just use dry bulk material and that’s that. For the further construction, I see no need for a bonded bulk material.

All the following work for the underfloor heating based on dry screed takes place on a 3cm thick EPS board, into which grooves are then cut so that the pipes fit there. This means that where the grooves are, we only have 1.5cm residual thickness of the EPS afterwards. So everything is extremely thin-walled and the point-like knee and foot load goes directly through the EPS to the substructure (filling). If this filling is LOOSE or I pour sand in, the loose fill underneath walks sideways when stepped on. Place a styrofoam board on flat leveled sand and then walk back and forth on it. Everyone knows what happens then. That is why it only works with a firm subfloor. An advantage of a filling is also the >insulation value