Materials+Review

Wood Posstive: cheap, lightweight, moderaly strong in compression and tension. Negative: rots, swellls and burns easily · this can be used in bridges, houses etc. Plastic Posstive: flexible, lightweight, strong in comprension and tension Negative: it’s very expensive · can be used at umbrellas roofs etc Aluminium Posstive: doesn’t rust, lightweight, and wasn’t easy to break. Megative: expesive · can be used to airplane wings, cars etc. Bricks This are strong in comprension but u cant crash then when u pulled for bouth sides. Possitive: cheap and strong in compresion Negative: heavy. · can be used in walls ,domes etc Concrete Posstive: cheap fireproof and waterproof, can take any shape. Negative:cracks with temperature changes and weak in tension. · can be used to arch bridges and domes. Reinforced concrete Its made off steel bars hiddem in concrete Possitive: low cost, fireproof and waterproof molds to any shape. Negative: can crack as it cools hardens. · used in beams and columns etc. Cast iron Made off iron with lots of carbon Possitive: molds to any shape and strong in compresion. Negative: breaks withouth warning and very expensive. · used in cannons and historic bridges Steel Made of iron with touch of carbon Posstive: one of the most stronger materials used in construction, Negative: rusts and expensive · used at cables in suspension bridges, trusses etc. 