Top Interview Questions for Fresher Civil Engineers 2021 ?

Does Water damage concrete ?

Plain concrete is not affected or damaged by water but Reinforced Concrete (RCC) can be damaged due to water. This is because the water may seep into the concrete and corrode the steel reinforcement inside and Detroit the steel .

What is chuting of concrete ?

Chute is used to transporting the concrete from where the mixing is done. Usually, it transports the concrete from the ground where the mixer machine is installed to a lower lever like foundation. 

How long can concrete last in a ready mix truck ? What happens when the driver can’t unload it on time ?

That depends largely on the temperature, the water/cement ratio, admixtures present, the sort of cement and supplementary cementitious materials present and their quantities etc. While some might think reference to initial setting time is relevant for either cement or concrete, it is not. Both those tests are done on static specimens in rigid moulds. A transit mixer is designed to mix concrete, not leave it sit still. Adding a lot of extra water will keep the concrete alive longer. There are admixtures designed to put concrete to sleep stop it setting. 

How will u measure the workability of concrete on site ?

  1. Slump Test
  2. Compacting Factor Test
  3. Flow Test
  4. Vee-Bee Consist meter Test
  5. Kelly Ball Test

 what is quick sand condition and how will you rectify it ?

Quicksand condition is the floatation of particles of cohesionless soil, like fine gravel and sand, due to vertical upward seepage flow. As sand boiling occurs, the bearing capacity and shear strength of the cohesionless soil decrease and the agitations of soil particles become apparent.

  • Excavations in granular materials behind cofferdams alongside rivers.
  • Any place where artesian pressures exist i.e. where head of water is greater than the usual static water pressure.
  • Behind river embankments to protect floods.
  • It can be prevented by lowering the water table at the site before excavation or alternatively, by increasing the length of upward flow. Boiling condition is also common when a pervious sand stratum underlying a clay soil is in an artesian pressure condition.

What is Green Buildings and materials to make green building ?

A ‘green’ building is a building that, in its design, construction or operation, reduces or eliminates negative impacts, and can create positive impacts, on our climate and natural environment. Green buildings preserve precious natural resources and improve our quality of life.

Components of Green Building

  1. Energy Efficiency and Renewable Energy.
  2. Water Efficiency.
  3. Environmentally Preferable Building Materials and Specifications.
  4. Waste Reduction.
  5. Toxics Reduction.
  6. Indoor Air Quality.
  7. Smart Growth and Sustainable Development.

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