Quiz – 1

Sand is mixed with Cement to make concrete instead of making cement. Materials which we get from these 3 rocks are useful to make healty PC.

Cement Rock comes in Argillocalcareous Rocks. And Calcareous Rocks have Limestone, Marl, Chalk, Marine Shell Deposits.

Portland cement is made by mixing substances containing CaCO3 with substances containing SiO2, Al2O3, Fe2O3 and heating them to a clinker which is subsequently ground to powder and mixed with 2-6 % gypsum.

1300-1600 °C is the best range to melt the raw materials for a healty PC. Below 1300 °C the materials whcih we added to make PC won’t melt perfectly and the result will be unhealty PC.

They are produced in a range of sizes and units with diameters up to 6 m and lengths up to 200 m have been made.

Lime forms nearly two-third (2/3) of the cement. Therefore sufficient quantity of the lime must be in the raw materials for the manufacturing of cement.

Sufficient quantity of lime forms di-calcium silicate (C2SiO2) and tri-calcium silicate in the manufacturing of cement.

Silica gives strength to the cement. Silica in excess causes the cement to set slowly.

There are 2 types of aggregates based on geological origin. They are natural aggregates and artificial aggregates.

There are 4 types of aggregates based on size. They are fine aggregates, coarse aggregates, all in aggregates and single size aggregates.