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 :
\[CaS{{O}_{4}}\cdot \frac{1}{2}{{H}_{2}}O+1\frac{1}{2}{{H}_{2}}O\xrightarrow{setting}\] \[\underset{\begin{smallmatrix} \text{gypsum} \\ \text{(orthorhombic)} \end{smallmatrix}}{\mathop{CaS{{O}_{4}}\cdot 2{{H}_{2}}O}}\,\xrightarrow{hardening}\underset{\begin{smallmatrix} \text{gypsum} \\ \text{(monoclinic)} \end{smallmatrix}}{\mathop{CaS{{O}_{4}}}}\,\cdot 2{{H}_{2}}O\]
You need to login to perform this action.
You will be redirected in
3 sec
