Building Materials
The compound of Portland cement which contributes to the strength after two to three years is

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

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Building Materials
Rapid hardening cement attains early strength due to

Excess percentage of gypsum
Lesser proportion of lime grounded finer than normal cement
Lesser proportion of lime grounded coarser than normal cement
Larger proportion of lime grounded finer than normal cement

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