Question 1. What are the methods of concrete curing?
Answer:
- Shading concrete work
- Covering concrete surfaces with hessian or gunny bags
- Sprinkling of water
- Ponding method
- Membrane curing
- Steam curing
Source:- Methods of concrete curing.
Question 2. Why are steel plates inserted inside bearings in elastomeric bearings?
Answer:
For elastomeric bearing to function as a soft spring, the bearing should be allowed for bulging laterally and the compression stiffness can be increased by limiting the amount of lateral bulging. To increase the compression stiffness of elastomeric bearings, metal plates are inserted.
After the addition of steel plates, the freedom to bulge is restricted and the deflection is reduced when compared with bearings without any steel plates under the same load. Tensile stresses are induced in these steel plates during their action in limiting the bulging of the elastomer. This, in turn, would limit the thickness of the steel plates.
Source: Why are steel plates inserted inside bearings in elastomeric bearings?
Question 3. What are the major types of reinforcement used in prestressing?
Answer:
(i) Spalling reinforcement
(ii) Equilibrium reinforcement
(iii) Bursting Reinforcement
Question 4. How to determine the number of cells for concrete box girder bridges?
Answer:
If the depth of a concrete box girder bridge exceeds 1/6 or 1/5 of the total bridge width then the single-cell box girder bridge is recommended. But if the depth of the bridge is lower than 1/6 of the total bridge width then it is preferable to choose a twin-cell or in some cases multiple cells.
Read details: Determine the Number of Cells for Concrete Box Girder Bridges
Question 5. What are the disadvantages of curing by ponding and polythene sheets?
Answer:
Disadvantages of Curing by Ponding & Polythene Sheet
Question 6. What are the types of concrete slump?
Answer:
- True slump
- Shear slump
- Collapse slump
Read details: Types of Concrete Slump
Question 7. Why Is Propping Required For Long Structures Once The Form Work Is Removed?
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