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Q: Which of the following property of ordinary Portland cement is improved by the pozzolana?
  • A. Bleeding
  • B. Heat of hydration
  • C. Permeability
  • D. Shrinkage
Correct Answer: Option C - Pozzolana reacts with the free lime. The pozzolanic materials are essentially siliceous or aluminous compounds which in itself do not possess any cementous property but when it reacts with Ca(OH)2, released during the hydration of cement, leads to formation of cementous compound. • When use pozzolana the water content is reduced for a given slump, thus the shrinkage after drying is also reduced.
C. Pozzolana reacts with the free lime. The pozzolanic materials are essentially siliceous or aluminous compounds which in itself do not possess any cementous property but when it reacts with Ca(OH)2, released during the hydration of cement, leads to formation of cementous compound. • When use pozzolana the water content is reduced for a given slump, thus the shrinkage after drying is also reduced.

Explanations:

Pozzolana reacts with the free lime. The pozzolanic materials are essentially siliceous or aluminous compounds which in itself do not possess any cementous property but when it reacts with Ca(OH)2, released during the hydration of cement, leads to formation of cementous compound. • When use pozzolana the water content is reduced for a given slump, thus the shrinkage after drying is also reduced.