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| 1
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Which
is the more popular process for manufacturing of cement: Wet/Dry? , Why?
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| 2
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How
does incomplete hydration affect the strength of concrete?
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| 3
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How
long does hydration continue? |
| 4 |
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| 5 |
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| 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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| 1
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What
is the difference between “Maximum Size” and
“Nominal Maximum Size” of
aggregates? |
| 2
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Why
the surface area of aggregate increases as the particle size decreases?
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| 3
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What
is the significance of aggregate grading? |
| 4
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What
is significance of specifying the maximum size of aggregates?
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| 5
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What
is the significance of specifying the amount of material passing the
300µm and
150 µm (ASTM No. 50 and 100) sieves? |
| 6
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Why
richer mix requires a lower content of fine sand?
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| 7
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Why
is presence (in excess) of Flaky or Elongated particles in
concrete considered undesirable? |
| 8
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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
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| 1
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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
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| 1
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What
is the difference between conventional water-reducing admixtures
& the
super plasticizers? |
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Concrete
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| 1
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What
is the difference between “High Strength Concrete”
& “High Performance
Concrete”? |
| 2
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What
is “No Fines” Concrete? |
| 3
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Bleeding
results is reduction of Water-Cement ratio. Then why is it considered
harmful? |
| 4
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How
is the mix for Roller Compacted Concrete different from the mix of
Conventional
Concrete? |
| 5
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How
is Self Compacting Concrete (SCC) different from High Slump
Concrete? |
| 6
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What
is the significance of Mixing time of concrete? |
| 7
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Why
do concrete specifications recommend a rate of withdrawal for immersion
vibrators? |
| 8
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Why
“slicing” along the form is required to be done?
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| 9
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Why
vibration improves strength of Concrete? |
| 10
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How
does Revibration help? What happens during Revibration?
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| 11
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What
are the causes for formation of bug holes &
honeycombing? How can
their formation be avoided? |
| 12
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How
can Fire Performance of High Strength Concrete be improved?
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| 13
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What
is the difference between Prestressing Tendons & Prestressing
Strands? |
| 14
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What
is the difference between Prestressing Duct & Prestressing
Sheathing? |
| 15
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What
is the difference between Entrapped air & Entrained air?
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| 16
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Does
the Portland stone really resemble the concrete made with Portland
Cement? |
| 17
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Why
cylindrical specimens are required to be capped for compression testing
whereas
there is no such requirement for cubical specimens?
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| 18
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Does
strength of capping material (in case of cylindrical specimens) affect
the
measured strength of concrete? |
| 19
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Why
grinding is not done in lieu of capping for preparation of cylinderical
specimens for compression test grinding method? |
| 20
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What
are the Tetrapods; which we see lying in the Marine drive, Mumbai?
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| 21
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What
is “Fly Ash” & why is it called so?
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| 22
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It
is said that for Fly Ash Concrete there is a need for extending
strength
specifications to beyond 28 days. Why? |
| 23
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What
do we mean by High Volume Fly Ash (HVFA) in reference to Concrete
Structures? |
| 24
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What
are the restraints on the use of Fly Ash Concrete in Highway
Constructions? |
| 25 |
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Shotcrete
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| 1
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What
is the significance of Coarse Aggregate to Fine aggregate ratio in
Shotcrete
mix design? |
| 2
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How
do we simultaneously satisfy the conflicting requirements of
“Pumpablity” &
“Shootability” of Shotcrete? |
| 3
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Does
usage of accelerators in Shotcrete affect its strength adversely?
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Reinforcement
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| 1
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What
are the advantages that TMT Bars offer? |
| 2
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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? |
