Building Materials
The compound of Portland cement which reacts immediately with water and also sets first is

Di-calcium silicate
Tri-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite

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Building Materials
Acrylic sheets

Possess the light transmission rate of 93%
Possess 10 to 17 times greater breakage resistance than that of glass of equivalent thickness
All of these
Are generally unaffected by most household detergents

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Building Materials
Sapwood consists of

Thin fibre which extends from the pith outwards and holds the annular rings together
Portion of timber between heartwood and cambium layer
Thin layers below the bark
Innermost annular rings around the pith

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