Learning Center

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Cement

1.

Which is the more popular process for manufacturing of cement: Wet/Dry? Why?

2.

How does incomplete hydration affect the strength of concrete?

3.

How long does hydration continue?

4.

Can PPC used for concreting of heavy RCC structures? If “Yes”, for which grades? If “No”, Why?

5.

What are the grades of PPC?

6.

We found that  one plaster sample whose pH value was 8- the strength was found alright. To the other sample of the same bldg. where plastering was done about one month back -found stregnth poor- surface scratchable when the plaster gets dry-the ph was about 11. Does increase in pH value have any relation with decrease in strength ? Pl. note the water source was same for both the plasters.can you please give any direction /answer to proceed in this regard.

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Aggregate

1.

What is the difference between “Maximum Size” and “Nominal Maximum Size” of aggregates?

2.

Why the surface area of aggregate increases as the particle size decreases?

3.

What is the significance of aggregate grading?

4.

What is significance of specifying the maximum size of aggregates?

5.

What is the significance of specifying the amount of material passing the 300µm and 150 µm (ASTM No. 50 and 100) sieves?

6.

Why richer mix requires a lower content of fine sand?

7.

Why is presence (in excess) of Flaky or Elongated particles in concrete considered undesirable?

8.

Why aggregates of low/moderate strength & modulus of elasticity can be valuable in preserving the durability of concrete?

9.

In India -Delhi the sand available is Fine Jamuna. In the Sand  mica particles are found  Pl. tell,what will be the affect of mica particles on the strength especially for plaster work. Can we measure the quanity of the mica particles?.

10.

Around Delhi (India),now a these days in place of Sand,Stone dust is being used. Can you please tell us ,what are the parameters for checking the quality of the stone dust at Field-site. Give us the Quality checks as per I.S. standards. Give us Tests as per I.S. 383. & their limits. Limit for Deleterious Materials–75 micron sieve.

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Water

1.

In many specifications, quality of water is covered by a clause saying that mixing water  should be fit for drinking. What is its significance? Will  drinking water always be  suitable as mixing water?

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Admixture

1.

What is the difference between conventional water-reducing admixtures & the super plasticizers?

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Concrete

1.

What is the difference between “High Strength Concrete” & “High Performance Concrete”?

2.

What is “No Fines” Concrete?

3.

Bleeding results is reduction of Water-Cement ratio. Then why is it considered harmful?

4.

How is the mix for Roller Compacted Concrete different from the mix of Conventional Concrete?

5.

What is the significance of Mixing time of concrete?

6.

What are the Tetrapods; which we see lying in the Marine drive, Mumbai?

7.

What is “Fly Ash” & why is it called so?

8.

It is said that for Fly Ash Concrete there is a need for extending strength specifications to beyond 28 days. Why?

9.

What do we mean by High Volume Fly Ash (HVFA) in reference to Concrete Structures?

10.

What are the restraints on the use of Fly Ash Concrete in Highway Constructions?

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Shotcrete

1.

What is the significance of Coarse Aggregate to Fine aggregate ratio in Shotcrete mix design?

2.

How do we simultaneously satisfy the conflicting requirements of “Pumpablity” & “Shootability” of Shotcrete?

3.

Does usage of accelerators in Shotcrete affect its strength adversely?

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Reinforcement

1.

What are the advantages that TMT Bars offer?

2.

It is often said that a significant quantity of TMT Bar that we purchase is actually not the TMT Bar that we want; its in fact the same old Tor bar. Is that true?

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Miscellaneous

1.

What should be the length and width of river for morphology study?

2.

What is post tensioned slab and what are its advantages?

3.

What are the various methods for “Rehabilitation” and “Repair” of bridges?

4.

What do we mean by “Basic Properties”, “Index Properties” & “Engineering Properties” in Geotechnical Engineering?

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