Civil Engineering - Concrete Technology - Discussion
Discussion Forum : Concrete Technology - Section 4 (Q.No. 16)
16.
Ordinary Portland cement is manufactured from
Discussion:
27 comments Page 1 of 3.
Midhun Madhav said:
8 years ago
The answer is B because the cement manufacturing process basically take 3 materials
1. Calcareous
2. Argillaceous
3. Gypsum.
The Limestone and Clay mentioned in Option A is correct but they are only 2 of the materials used for production. Marl, Chalk can also be used as other sources other than limestone. This is the reason it is Option B.
Most important part is Calcareous materials are those which contain lime and not limestone.
1. Calcareous
2. Argillaceous
3. Gypsum.
The Limestone and Clay mentioned in Option A is correct but they are only 2 of the materials used for production. Marl, Chalk can also be used as other sources other than limestone. This is the reason it is Option B.
Most important part is Calcareous materials are those which contain lime and not limestone.
(1)
Ajay nakum said:
8 years ago
The manufacturing process of Ordinary Portland cement is made primarily from calcareous and argillaceous materials, such as limestone or chalk, and from aluminium oxide, silica oxide, ferric oxide and magnesium oxide found as clay or shale.
Bugti Mehdi said:
2 years ago
Option A is correct.
The main constituents of Portland cement are argillaceous and calcareous materials.
Argillaceous materials are clay, shale, etc.
Calcareous materials are limestone, Chalk, etc.
The main constituents of Portland cement are argillaceous and calcareous materials.
Argillaceous materials are clay, shale, etc.
Calcareous materials are limestone, Chalk, etc.
(1)
Muhammad Rafique Rana said:
3 years ago
To make Portland cement, clay, shale and limestone is ground to a powder and baked in a kiln. The baked mixture forms clods (clinkers), which are then ground up and mixed with gypsum.
Vivek said:
1 decade ago
Option B may be correct but one should also bear in the mind that for ordinary cement concrete there are two important ingredients
1) argillaceous.
2) calcareous.
1) argillaceous.
2) calcareous.
Avinash Reddy said:
7 years ago
A is correct lime stone (calcareous) and clay (aluminum, silica, ferric oxides) because 5% of gypsum is added just to overcome quick setting of cement.
Vikki said:
7 years ago
Gypsum is a important part of cement so I think B option is a correct explanation because without gypsum cement set imideatly after mixing water.
(2)
SK ABDUL SURAJ said:
9 years ago
It should be A.
Because 1/3 of argillaceous material as clay & shals and 2/3 of calcareous material as limestone, chalk, marl.
Because 1/3 of argillaceous material as clay & shals and 2/3 of calcareous material as limestone, chalk, marl.
Lucky said:
10 years ago
Option A is correct.
As limestone as calcareous material while clay as argillaceous material used for manufacturing OPC.
As limestone as calcareous material while clay as argillaceous material used for manufacturing OPC.
Rajan pokhrel said:
6 years ago
Option A Gypsum is only a small amount so the correct answer is limestone and clay.
(1)
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