CIVIL ENGINEERING QUESTIONS AND ANSWER
TWO MARK QUESTION AND ANSWERS UNIT-I CONCRETE MAKING MATERIALS 1. What is meant by Surkhi? Surkhi is fine powdered under burnt bricks. It is also known as artificial pozzolona 2. Define hydration of cement? Cement in dry state has no bonding property. When mixed with water react Chemically and becomes a bonding agent. These reactions are called hydration. 3. Define setting of cement When water is added to cement, hydration takes place immediately as it continuous, cement paste which is plastic becomes stiff and rigid known as setting of cement. 4. What are pozzolonas? These are siliceous materials which, while having no cementations values within themselves, will chemically react with calcium hydroxide at ordinary temperature and in the presence of moisture to form compounds possessing cementitious properties. 5. Name any 2 natural pozzolonas. Clay and shales, opalinc cherts, diatomaceous earth, volcanic tuffs and pumicites. 6. Name