Bitumen in solid stale, is called asphalt semi fluid state, is called mineral ta

Question

Bitumen in solid stale, is called asphalt semi fluid state, is called mineral tar fluid state, is called petroleum all the above. A badly mixed cement concrete results in segregation bleeding phoney combing none to these. Inner part of a timber log surrounding the pitch, is called sapwood cambium layer heart wood none to these. A lab lest for specific gravity, on two samples of lumber indicate that sample A has G-0.4 and sample B has G-0.9. Based on this information alone, which wood sample would you choose as a structural member for your construction project? Please explain why.

Explanation / Answer

8 D

9 C

10 C

2)

specific gravity of sample A = 0.4

specific gravity of sample B= 0.9

some properties of wood increase directly with increase in specific gravity while others increase more rapidly .Crushing strength parallel to grain and shrinkag are examples of properties that vary directly with specific gravity

i would use the wood sample B with G =0.9 because it has more compressive strength compared to A

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