Making and storing lime plasters yourself

Hello,

I intended to make my own mortar but I am not sure if it hardens by itself while packed. Can someone explain to me how to make lime plasters so that they can be filled into bags and stored until use.

The mixture is simple

Lime and sand

Sorry, but the answer is "Not at all." Unless you have the appropriate bags and machines so that you can work airtight.

When doing it yourself, the focus is on doing, not storing. So produce and then consume.

So that means I have to vacuum-seal the lime sand mixture? Possible bags that could be used? Which machines? I meant just put it into the concrete mixer with the lime sand mixture and then into the bag. How do companies do it with their lime plasters Knauf etc.?

Just ask the companies where they get their sacks from and which production machines you need to order.

I can only tell you that the calcium hydroxide (air lime) reacts with the humidity. At first, lumps form and in the end, the sack becomes rock hard. This also happens with sacks from the factory, but it takes much longer (years). It's chemistry and cannot be outsmarted without airtight packaging.

I can already see it's not going to be as easy with the stockpile as I thought, I guess airtight packaging will be the least of the problems (plastic bags and airtight sealing, the sand I mix in has to be 100% dry anyway). It would even be enough for me if I could prepare a stockpile for one week, so a one-week shelf life.

Pure lime plaster is just ridiculously expensive, no one would pay me per square meter for that, but on the other hand, it looks way too good when applied as a base coat. Would anyone have a suggestion on how something like that might be possible?

Pure lime does not harden. Not due to humidity. You can basically mix it with sand and store it in foil bags. Of course dry, that's clear.

As soon as cement is added, it hardens after a certain time.

For example, the adhesive and reinforcement mortar also do not harden. Masonry and screed concrete harden relatively quickly. Lime cement plaster also lasts longer.

The hardware store sacks have a layer of foil in the middle between the paper. Therefore relatively durable.

I once had a sack of lime stored in the barn that had relatively high humidity. It was still perfectly fine after 10 years despite the opened container. That surprised me myself.