A) keeping it cool
B) developing interlocking needle-like crystals of hydrated silicates
C) hydrating sand and gravel mixed with cement
D) converting sand into silicic acid
Correct Answer: B
Solution :
The most important requirement in curing cement plaster is the presence of sufficient water in the mortar (gravel) to hydrate the cement paste. \[CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O+l\frac{1}{2}{{H}_{2}}O\xrightarrow{Setting}\] \[CaS{{O}_{4}}.2{{H}_{2}}O\] Gypsum (orthorhombic)] \[\downarrow \] Hardening \[CaS{{O}_{4}}.\,\,2{{H}_{2}}O\] Gypsum (mono clinic)
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