Civil Engineering Interview Questions and Answers
Question - 31 : - What reinforcements are used in the process of prestressing?
Answer - 31 : -
The major types of reinforcements used in prestressing are:
Spalling Reinforcement: The spalling stresses leads to stress behind the loaded area of the anchor blocks. This results in the breaking off of the surface concrete. The most likely causes of such types of stresses are Poisson`s effects strain interoperability or by the stress trajectory shapes.
Equilibrium reinforcements: This type of reinforcements are required where several anchorages exist where the prestressing loads are applied in a sequential manner.
Bursting Reinforcements: These kinds of stresses occur in cases where the stress trajectories are concave towards the line of action of load. In order to reduce such stresses, reinforcements in the form of bursting are required.
Question - 32 : - What are the common ways of demolition?
Answer - 32 : -
• Hydro-demolition
• Pressure Bursting
• Dismantling
Question - 33 : - What are the main reasons for conducting pull-out tests for soil nails?
Answer - 33 : -
There are mainly four reasons for this test:
- To check and verify the bond strength between soil and grout adopted during the design of soil nails. This is the main objective of conducting soil nail pull-out test.
- To determine the bond strength between soil and grout for future design purpose. However, if this target is to be achieved, the test nails should be loaded to determine the ultimate soil/grout bond with an upper limit of 80% of the ultimate tensile strength of steel bars.
- To check if there is any slippage or creep occurrence.
- To check the elastic and plastic deformations of test nails. This is observed during the repeated loading and unloading cycles of soil nails.
Question - 34 : - Explain QA&QC ?
Answer - 34 : -
Quality Assurance (QA): Quality Assurance is a set of activities for ensuring quality in the processes by which works are done. Quality Assurance is the process of managing for quality.
Quality Control (QC): Quality Control is a set of activities for ensuring quality in works. The activities focus on identifying defects in the actual products produced. Quality Control is used to verify the quality of the output.
Question - 35 : - What Is The Ratio Of Grades M5, M7.5, M10, M15, M20, M25, M30, M35, M40?
Answer - 35 : -
M5 – 1:5:10
M7.5 – 1:4:8
M10 – 1:3:6
M15 – 1:2:4
M20 – 1:1.5:3
M25 – 1:1:2
M30, M35, M40 – Design Mix Followed