Building Materials
The constituent of cement which is responsible for all the undesirable properties of cement is

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

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Building Materials
Sapwood consists of

Portion of timber between heartwood and cambium layer
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

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