Concrete Technology Practice Test 6

1. It is observed that 14-34% of the 20 years shrinkage occurs in ________

2. Strength of concrete increase with _____________

3. If the stress is removed, the specimen shows an instantaneous recovery strain ___ the elastic strain on loading.

4. Concentration of water-soluble sulphates in water ___________ ppm for severe exposure.

5. The continuous strain, which the concrete undergoes due to application of external loads, is called __________

6. When the ____________ content is low, most ettringite will be formed in the plastic state.

7. The philosophy of prescribing low ____________ cement to improve resistance to sulphate attack.

8. Concentration of water-soluble sulphates in water ___________ ppm for mild exposure.

9. Carbonic Acid + Ca(OH)₂ ⇨ X. What is the main compound in X?

10. If there is continuous supply of H₂O to the concrete during hydration, concrete expands due to absorption of water by the cement gel.