Answer Posted / khanna

One of the most important test conducted on cement is soundness test. This test certifies how the concrete prepared with that cement will behave in the next 80 years, when subjected to weathering, I.e., hot days cool nights, summers and winters etc.
Two methods of testing is prescribed by BIS. First one Le-chatlier method is old, crude but cheap and is available in all the labs, and second one autoclave method is modern and costly, therefore not available in all the labs.
My experience says 99% cement samples passed in le chatliers expansion shows poor results in autoclave expansion.
To generalise RCC age as 80 years is wrong, as even the building is ideally constructed, following all building code, but the cement is not tested as per autoclave expansion than the life of RCC may be reduced considerably.
Looking at the present constructions the safe life of RCC may be taken as 80 years, if constructed as per NBC of BIS.
Even the IS-456 is modified again in 2000.
A small house is constructed on word of mouth assurance of material vendors that material is in order, of labour contractor that every material is properly mixed and placed in position, of architect and structural engineers that sufficient factor of safety has been considered, but who will be alive after half life of building, to see different type of failures of RCC.

Suggest how many column, beem, etc required for 30 mtrs x 21 mtrs width x 8mtrs height for industrial shed of ground floor. I want to know the quantity of tmt steel consumption and Concrete consumption for budgeting

1755

---

cement and sand required for one block of size 0.23*0.15*0.46

1775

---

What is the difference between absorption & adsorption and sorption?

1141

---

There are two buildings one taller and one shorter whose time period will be grater and similarly the frequency ?

1612

---

Form where IS456 is adopted in 1978?

1924

---

hi guys what happens if you are absent for a supplymentry exam?

1787

---

what is Brest Wall?

1289

---

can stub column take the load as main column

1862

---

Define What is the origin of name Railway Sleepers?

1241

---

How are freeway bridges built?

1206

---

very simple or less time consuming formula for reinforcement calculation by moment

1431

---

1. What is coefficient use for calculation of shuttering. 2. What is coefficient use for calculation of reinforcement in one cum of concrete.

8056

---

how do you calculate the quantity of steel,cement for plinth beam. (example size 41'*0.58'*1.08')

2577

---

HOW MUCH STEEL REQUIRED FOR SLAB OF AREA 23'3"*18.3"? FOR SLAB HOW MUCH DIAMETER BAR WILL USE?

2149

---

what is that one cub metre plaster in cemant and fine sand

1975

---