An arena, is a covered or not covered enclosed area, often circular or oval-shaped, designed to showcase theater, musical performances, or sporting events.
 The word derives from Latin "harena", a particularly fine/smooth sand used to absorb blood in ancient arenas such as the Colosseum in Rome, Italy.
 It is composed of a large open space surrounded on most or all sides by tiered seating for spectators.
 The key feature of an arena is that the event space is the lowest point, allowing for maximum visibility.
 Arenas are usually designed to accommodate a large number of spectators.
Rudite is a general name used for a sedimentary rocks that are composed of rounded or angular detrital grains, i.e. granules, pebbles, cobbles, and boulders, which are coarser than sand in size.
 Rudites include sedimentary rocks composed of both siliciclastic, i.e. conglomerate and breccia, and carbonate grains, i.e. calcirudite and rudstone.
 This term is equivalent to the Greek-derived term, psephite.
 Rudite was initially proposed by Grabau as "rudyte."
 It is derived from the Latin word, "rudus," for "crushed stone," "rubbish," "debris," and "rubble."
Silver sand is a fine white sand used in gardening.
 It consists largely of quartz particles that are not coated with iron oxides. Iron oxides colour sand from yellows to rich browns. Silver sand is also used as a constituent of mortar for laying light coloured pavers.
Bungaroosh (also spelt bungeroosh, bungarouche, bungarooge, bunglarooge, bunglarouge and other variations) is a composite building material used almost exclusively in the English seaside resort of Brighton and its attached neighbour Hove between the mid-18th and late 19th centuries, when it grew from a fishing village into a large town.
 Bungaroosh is often found in buildings of that era in the town and in its near neighbours Worthing and Lewes, but is little known elsewhere.
 In this respect, it is similar to mathematical tiles - another localised building material introduced in, and characteristic of, that era.
 It can incorporate any of a wide variety of substances and materials, and is used most often in external walls.
Mortar is a workable paste used to bind building blocks such as stones, bricks, and concrete masonry units together, fill and seal the irregular gaps between them, and sometimes add decorative colors or patterns in masonry walls.
 In its broadest sense mortar includes pitch, asphalt, and soft mud or clay, such as used between mud bricks.
 "Mortar" comes from Latin "mortarium" meaning crushed.
A biocidal natural building material is a natural building material which has biocidal properties.
 The biocidal properties of biocidal natural building materials are inherent to the material, rather than being supplemented afterwards.
 This makes that the material is long lasting and inexpensive, as no additional processing needs to be done.
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.
Building material is any material which is used for construction purposes.
 Many naturally occurring substances, such as clay, rocks, sand, and wood, even twigs and leaves, have been used to construct buildings. Apart from naturally occurring materials, many man-made products are in use, some more and some less synthetic.
 The manufacture of building materials is an established industry in many countries and the use of these materials is typically segmented into specific specialty trades, such as carpentry, insulation, plumbing, and roofing work.
 They provide the make-up of s and structures including homes.
Foam glass is a porous glass foam material.
 Its advantages as a building material include its light weight, high strength and its thermal and acoustic insulating properties.
 It is made by heating a mixture of crushed or granulated glass and a blowing agent (chemical foaming agent) such as carbon or limestone.
 Near the melting point of the glass, the blowing agent releases a gas, producing a foaming effect in the glass.
 After cooling the mixture hardens into a rigid material with gas-filled closed-cell pores comprising a large portion of its volume.
Wattle and daub is a composite building material used for making walls, in which a woven lattice of wooden strips called "wattle" is "daubed" with a sticky material usually made of some combination of wet soil, clay, sand, animal dung and straw.
 Wattle and daub has been used for at least 6,000 years and is still an important construction material in many parts of the world.
 Many historic buildings include wattle and daub construction, and the technique is becoming popular again in more developed areas as a low-impact sustainable building technique.

Question: What is the ratio of the building material that is named for the Latin word "crushed" and sand used to stabilize buildings?
Answer: 1:5