Cement production and constitutes

What are the two major raw materials for ordinary Portland cement production?

• sand, water

• sandstone, glass

• limestone, clay

• meat, rice

What is the required temperature for the calcination of limestone and what is the major emitted gas?

• 1100, NO2

• 1100, CO2

• 100, NO2

• 100, CO2

What are the four major compounds found in Ordinary Portland Cement? (C= CaO, S =SiO2, A=Al2O3, F=Fe2O3)

• C3S, C3S, C3A, C4AF

• C, S, A, F

• CC, SA, FA, SC

• C5S2, C8F, F7S, S2C2F4

The cement clinker (produced after the heat drying process) is mixed and ground with gypsum to make the final produce - Portland cement powder. What is the purpose of adding gypsum?

• increase the strength

• give the color

• reduce the CO2 emission

• prevent flash setting (quickly turning into solid after mixing with water)

Which of the following compound hyrdration dictates the major properties of hydrated cement? Hint: it constitutes about 45-60 % of cement powder.

• C3A

• C4AF

• C

• C3S