Pykrete
Pykrete is a frozen ice alloy, originally made of approximately 14 per cent sawdust or some other form of wood pulp (such as paper) and 86 per cent ice by weight (6 to 1 by weight). During World War II, Geoffrey Pyke proposed it as a candidate material for a supersized aircraft carrier for the British Royal Navy. Pykrete features unusual properties, including a relatively slow melting rate due to its low thermal conductivity, as well as a vastly improved strength and toughness compared to ordinary ice. These physical properties can make the material comparable to concrete, as long as the material is kept frozen.

Pykrete is slightly more difficult to form than concrete, as it expands during the freezing process. However, it can be repaired and maintained using seawater as a raw material. The mixture can be moulded into any shape and frozen, and it will be tough and durable, as long as it is kept at or below freezing temperature. Resistance to gradual creep or sagging is improved by lowering the temperature further, to .
Q816713
sawdust
Concept
Q672506
wood pulp
Concept
Q23392
ice
Concept
Q362
World War II
EVE
Q1822124
Geoffrey Pyke
PER
Q1156392
supersized aircraft carrier
MISC
Q172771
Royal Navy
ORG
Q487005
thermal conductivity
MISC
Q240553
strength
Concept
Q486802
toughness
Concept
Q22657
concrete
Concept
Q184395
seawater
Concept
Q1128830
Pykrete
Concept
Q1128830
Pykrete
Concept
Q1128830
Pykrete
Concept
+14^^http://www.w3.org/2001/XMLSchema#decimal
14
NUMBER
+86^^http://www.w3.org/2001/XMLSchema#decimal
86
NUMBER
+6^^http://www.w3.org/2001/XMLSchema#decimal
6
NUMBER
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
made from material
made from material
named after
conflict