Very favorably. Think of how big a bag of cement is. Using a timber mold like the one used in the video you can leave 100s (if not 1000s) of bricks to dry in one day. You need some materials like clay soil, straw and sand, some which might be sourced on-site. It might take a day or two in hot sun for the bricks to dry, but this can be done in large batches with enough space. They also can be fired in a kiln for extra strength, but that would forgo some CO2 benefits.

You know cement is not used to make the bricks right?

On one hand I'll refer you to the comment I was replying to:

https://news.ycombinator.com/item?id=37927320

On the other I'll point you to this common structural building material:

https://en.wikipedia.org/wiki/Concrete_block

25kg of cement is roughly 12L of 'concrete. 12L is 20cmx30x20cm (8x12x8 inches for the freedom loving folks)

From a quick Google search: 1m3 of concrete = 150l water + 250kg cement + 700kg sand + 1200kg aggregates.

Even if you used just cement and water I think you would get more than 12L from 25kg.

True, I meant pre-mixed bag of cement + sand.

>Even if you used just cement and water I think you would get more than 12L from 25kg.

The thing will crack very soon. The density of concrete is around 2.4g/cm3

I think a bag of cement would go a very long way for making mortar for a rock wall. Why make bricks when you can just use rocks and stick them together with a little bit of cement.

Bricks were made for uniformity so you could have it as a known quantity and spit them out of an assembly line. If you're making bricks, you've already lost this game.

The video at 6:11 briefly touches on making mortar and stone construction (along with visuals):

> binding material or mortar should be of the same constituency as the brick or stone white gypsum and sand mortar go well with sandstone mortar made of lime clay and sand is suitable for our newly developed mud bricks

https://youtu.be/f_q1pYl80pc?si=sP1GwbWT3UfFVsBW&t=371