Building Materials
Good quality cement contains higher percentage of

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

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Building Materials
Sapwood consists of

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

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