What is the ratio of the building material that is named for the Latin word "crushed" and sand used to stabilize buildings?
Sandcrete Sandcrete is a yellow-white building material made from a binder (typically Portland cement), sand in a ratio of circa 1:8, and water. Sometimes other ingredients may be added to reduce the amount of expensive Portland cement such as pozzolanas and rice husk ash. Sandcrete is similar but weaker than mortar, for which the ratio is circa 1:5. "Soil cement" and "landcrete" are similar materials but use other types of soil and hydraform blocks which are compressed, stabilized, earth blocks.
Surficial aquifer Surficial aquifers are shallow aquifers typically less than 50 ft thick, but larger surficial aquifers of about 60 ft have been mapped. They mostly consist of unconsolidated sand enclosed by layers of limestone, sandstone or clay and the water is commonly extracted for urban use. The aquifers are replenished by streams and from precipitation and can vary in volume considerably as the water table fluctuates. Being shallow,they are liable to contamination by fuel spills, industrial discharge, landfills, and saltwater. Parts of southeastern United States are dependent on surficial aquifers for their water supplies.