Cement reactions

What are the four major compounds found in raw ordinary Portland cement?

• C3S, C2S, C3A, C4AF

• SO3, SiC, CAA, CO2

• FeO, NO2, NaCl, N2

• C-S-H, CH, Ettringite, H

What is the major major hydration product of cement?

• Ettringite

• C3S

• C-S-H

• H

Sulfate attack on concrete can produce cracking and spalling. What is the cause?

• early ettringite formation (EEF)

• delayed ettringite formation (DEF)

• delayed sleeping

• delayed C-S-H formation

Moisture curing of concrete can increase strength. Why?

• delayed ettringite formation

• hydration of unreacted cement grains.

• hydration of gypsum

• hydration of aggregate

Cement hydration is a heat-releasing reaction. To reduce the hydration heat, the best way is to partially replace cement with...

• gypsum

• sand

• pozzolans

• water