Wood Flashcards
(45 cards)
wood has [] compressive and tensile strength
high
wood has relatively [] density
low
wood is readily [] and [] cost
available
low cost
wood has good [] properties and [] fire behaviour
thermal
predictable
wood can be sustainable if it harvested from a [] forest
sustainable forest
what does it mean when the properties of wood vary in different directions?
it is anisotropic
wood often contains inherent []
flaws
the harvesting of wood is often associated with
high transport costs
wood is susceptible to attack from
insects, bacteria and fungi
wood must be [] before use
dried
wood has [] embodied energy consumption
low
What do we mean when we say wood has a low embodied energy?
converting timber into a usable material takes far less energy and generates far fewer greenhouse gases than other mainstream alternatives
wood is a good [] material
insulating
what does FSC stand for?
forest stewardship council
what does the FSC do?
promote responsible management of the world’s forests
combat illegal and unethical logging
timber is an [],[] and naturally [] building material
organic
non-toxic
renewable
forests act as
carbon sinks
what are the components of dry wood and their proportions?
cellulose 50%
hemicellulose and pectin 20%
lignin 25%
extractives 5%
50% of the dry weight of earth’s biomass is in the form of
glucose polymers
glucose has a [] structure
ring
glucose has a [] structure
ring
cellulose has a [] structure, held together with [] bonds
crystalline structure
hydrogen bonds
lignin is a massive random [] of []
polymer
phenylpropane alcohol
as cut wood has a moisture content of
85%
