You can make homemade concrete. Ancient people made homemade concrete and you can, too. Making concrete at home without buying a bag of concrete. Learn how to create your own concrete mix for home improvement, or green living.
Learn how to identify limestone. it's whitish rock that's available from a quarry or from your local hardware store or garden shop. It's often used in the garden. It's available just about everywhere on the planet.
Cook the limestones over fire, they will change completely, they will swell up, becoming less dense.
Allow the cooked stones to cool off completely
Pour water over top of the cooled stones and they will hiss and crack, the solid parts will turn into an absorbent powder. They will mush and then you're almost done making homemade concrete.
Add sand and small pebbles (but not soil) to the homemade concrete cement. Mix it all thoroughly.