Resources for the Future Pizer and Kopp. 3. cost to the economy.5 This is the notion of cost most often described by economists (e.g., Harberger 1971; Diamond and Mirrlees 1971). Defining and estimating Ci ()az, is far from trivial.
For stepping stones that are going to see a lot of use, you should consider using reinforced concrete so that your stepping stones are more durable. This type of concrete also sells at most hardware stores, often under the names gravel mix reinforced or fiber reinforced premixed concrete..
11. Sweep coarse masonry sand into the cracks between the stones after the concrete cures. You can also use polymeric sand and spray it gently with a mist of water; the polymers in the sand cause it to harden as it dries. For a more casual look, fill in the cracks with soil and sow grass seed in the soil.1  Dig This.. Scoop the colored concrete mix onto the walkway mold and use a small hand tool such as a mason's trowel to push it into each of the holes that comprise the mold. One 80-pound bag of concrete mix fills one 2-by-2-foot stone walkway mold.