Question:
The two main constituents of Portland cement are
The two main constituents of Portland cement are
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The major constituents of Portland cement are lime \((CaO)\) and silica \((SiO_2)\). Excess \(MgO\) in cement is undesirable because it causes cracking.
Updated On: Jun 22, 2026
- \(CaO,\ SiO_2\)
- \(CaO,\ Al_2O_3\)
- \(SiO_2,\ MgO\)
- \(CaO,\ MgO\)
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The Correct Option is A
Solution and Explanation
Step 1: Recall the composition of Portland cement.
Portland cement is mainly prepared from limestone and clay.
The major constituents present in Portland cement are: \[ CaO,\ SiO_2,\ Al_2O_3,\ Fe_2O_3 \] Among these, the largest proportion is of: \[ CaO \] and \[ SiO_2 \]
Step 2: Role of the constituents.
\[ CaO \] provides strength and hardness to cement.
\[ SiO_2 \] is responsible for durability and setting properties.
Therefore, these are considered the two principal constituents of Portland cement.
Step 3: Analyze the options.
(1) \(CaO,\ SiO_2\): Correct.
(2) \(CaO,\ Al_2O_3\): Incorrect, because \(Al_2O_3\) is present in smaller amount.
(3) \(SiO_2,\ MgO\): Incorrect, because \(MgO\) is only a minor constituent.
(4) \(CaO,\ MgO\): Incorrect, because \(MgO\) is not a major constituent.
Step 4: Final conclusion.
Hence, the two main constituents of Portland cement are \[ \boxed{CaO,\ SiO_2} \]
Portland cement is mainly prepared from limestone and clay.
The major constituents present in Portland cement are: \[ CaO,\ SiO_2,\ Al_2O_3,\ Fe_2O_3 \] Among these, the largest proportion is of: \[ CaO \] and \[ SiO_2 \]
Step 2: Role of the constituents.
\[ CaO \] provides strength and hardness to cement.
\[ SiO_2 \] is responsible for durability and setting properties.
Therefore, these are considered the two principal constituents of Portland cement.
Step 3: Analyze the options.
(1) \(CaO,\ SiO_2\): Correct.
(2) \(CaO,\ Al_2O_3\): Incorrect, because \(Al_2O_3\) is present in smaller amount.
(3) \(SiO_2,\ MgO\): Incorrect, because \(MgO\) is only a minor constituent.
(4) \(CaO,\ MgO\): Incorrect, because \(MgO\) is not a major constituent.
Step 4: Final conclusion.
Hence, the two main constituents of Portland cement are \[ \boxed{CaO,\ SiO_2} \]
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