Mixing concrete powder into the gravel driveway Page 2
#0183;#32;It''s been done many times. Topsoil is stripped away. Portland cement is spread and rototilled into the gravel. It is then tamped down with a plate compactor or roller. Moisture is absorbed from the soil and it sets. One bag of portland cement (94 pounds) is exactly one cubic foot. If you know how deep your tiller tills you can calculate the ratio.