Discussion
State whether the following is true or false.
Calcium hydroxide is the main source of strength in hardened cement paste.
Answer: D
Correct answer: False
Strength comes from calcium silicate hydrate, the poorly crystalline gel that makes up roughly half the volume of hardened paste and binds everything together. Calcium hydroxide is a by-product, forming perhaps a quarter of the solids as large crystals that contribute little strength and are the phase most readily leached or attacked. Its real value is keeping the pore water alkaline enough to passivate the reinforcement.
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