Concrete Questions

1. On what projects are you currently working on?
2. What do you understand by drains previously constructed with inadequate capacity, resulting in
overtopping? Have the drains been incorrectly designed?
3. Methodology for drain design
4. You are supervising the construction of drains and the drain path has to go through a private
property. At design stage, the Client did not ask for wayleave and now the private property owner
is not giving permission to construct the drain on his property. What are the steps to follow?
5. Say at preliminary design stage, you have sized a drain 1m wide and the Client has asked
Contractors to tender for that drain. When you are revising your calculations you find out that the
drain should be 1.5m wide and not 1m wide. What do you do considering invitation for tender has
already been launched?
Concrete Questions
 What do you test with concrete test cubes?
 Suppose you have 2 concrete cubes which fail at 7 days and 1 which passes at 28 days, what do
you do?
 Suppose there is casting at night and the concrete plant has already been closed. When doing the
slump for the 5th lorry out of 7 lorries, the slump fails. What do you do?
 Is a concrete having a slump of 60 stronger than a concrete having a slump of 130?
 When crushing 100 concrete cubes, how many do you expect to pass the test and how many will
fail the test?
 What do you do to ensure that the whole batch passes the test?
 What is a slump test? State the steps taken to conduct a slump test.
 What is usual slump range?
 When do you reject a batch of concrete?
 What are the problems that may have when using a concrete pump?
 What are the possible solutions?
 Methodology to repair honeycombing
 How would you ensure the validity of reparation works conducted?
 State the defects encountered during inspection of concrete structures.
Bending moments and reactions
6. What is soil bearing capacity?
7. How do you design a base?
8. What are the factors you consider when designing a base?
9. How do you design a base with axial load and moment?
10. Draw the bending moment diagram when you have axial load and moment on a base.
11. Why do you check a base at SLS?
12. Detailing of a 3 span beam.
13. Design of columns
14. Detailing of columns
Contract Management
 What is liquidated damages?

 How is liquidated damages applied?
 What is extension of time? How do you assess it?
 What are variations?
Roof Design
 How do you design a mono pitch roof?
 Draw the bending moment and deflected shape of a mono pitch roof.
 How to you call the support at the ridge?
 What is a braced frame?
 How do you design braced and unbraced columns?
 How do you determine the cover to be used?
 Is cover related to bar diameter?
Design of Reinforced Concrete Structures
 How do you design a slab?
 What are the main criteria taken into consideration in the design of a slab?
 Define a one-way spanning and a two-way spanning slab.
 What is a shrinkage crack and explain its occurrence?
 Say you are supervising the casting of a continuous slab and there is shortage of concrete at mid
span. What do you do?
 Difference between ULS and SLS
 How do you design a beam?
 How do you cater for shear?
 Is shear critical in slab or beam and why?
 How do you design deep beams?
 Assume that a slab is two-way spanning and to reduce delays, the contractor is proposing to use
precast slabs. Would you accept it and why?
 When do you use the simplified method for the analysis of beams?
 What is the maximum spacing of bars in a pad footing?
 Define a two-way and one-way spanning slab?
 Why do you size a base at SLS?
 Assume that instead of putting Y12-150 in a base, the contractor has placed Y12-170, what would
you do?
 A slab has been cast and the 28 days concrete cube test has not pass, what would you do?
Contract Management
 Explain the meaning of the term variation.
 What do you do if a Contractor does not complete a project on time?
 Explain the meaning of liquidated damages.
 What is a performance security? Why is it important?
 What documents should the contractor submit after contractor has been awarded to him?
 What happens when a bidder does not submit a bid security as required by the bidding document?
 The contract period has been extended, and the bank is not willing to extend the performance
security of the contractor. What do you do?
 How would you repair honeycombing in columns?
 How do you determine diameter and spacing of links for columns?
 How would you ensure that concrete grade 30 has been used for the reparation work?
 When doing inspection of bases, how do you determine that the base has been designed as pinned
and fixed?
 To what angle does the load distribute to the ground?
 Detailing of above beam with length of top bar.
 Draw the bending moment diagram of a continuous beam supporting uniformly distributed load.
 What is a retention bond?
 What is a bid security?
 What is liquidated damages?
 What is the difference between a bill of quantity and activity schedule?
 When do you use activity schedule?
 What is the difference between Fidic and Conditions of contract from PPO? Which condition of
contract do you use at work?
 What is the difference between a design and build contract and a normal contract?
 When extension of time is granted to contractor?
 List some factors which prevent a contractor from completing the work on time.
 Assuming that it is the contractor’s fault for not achieving the completion date, what do you do?
Do you apply liquidated damages?
 What is the maximum percentage for liquidated damages that can be deducted?
 Do you actually apply liquidated damages when a contractor defaults?
 Which condition of contract do you use at work?
 What is the difference between a design and build contract and a normal contract?
 When extension of time is granted to contractor?
 List some factors which prevent a contractor from completing the work on time.
 Assuming that it is the contractor’s fault for not achieving the completion date, what do you do?
Do you apply liquidated damages?
 What is the maximum percentage for liquidated damages that can be deducted?
 Do you actually apply liquidated damages when a contractor defaults?
 What is the difference between bid security and bid securing declaration?
 What is the percentage for retention bond?
Retaining Wall Structure

 Minimum crack width for a water retaining structure?
 What do you check a base?
Excavation
 How would you protect an existing base when construction is being carried out next to it?
 What checks would you perform on the existing building to ensure that construction can be carried
out next to it?
 How would you process with the excavation work without disturbing the existing footing?
Soil Investigation
 Why do you carry out percolation test?
 Do you think trial pits and percolation tests only are sufficient to assess soil suitability? What
other tests should be carried out?
 Why bases should not be placed on loose soil?

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Concrete Questions

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1. On what projects are you currently working on?

3. Methodology for drain design

6. What is soil bearing capacity?

7. How do you design a base?

8. What are the factors you consider when designing a base?

9. How do you design a base with axial load and moment?

11. Why do you check a base at SLS?

12. Detailing of a 3 span beam.

13. Design of columns

14. Detailing of columns

 What is liquidated damages?

Retaining Wall Structure

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