Civil Engineering - Concrete Technology - Discussion

The correct answer is: **low heat cement**.

Explanation:

For the construction of *thin reinforced concrete (R.C.C.) structures*, the *type of cement to be avoided* is *low heat cement*.

Here's why:
*Low heat cement** is designed to produce *less heat of hydration* during the setting and hardening process. This is useful for large structures (like massive foundations or dams) where excessive heat generation could lead to cracking due to thermal expansion.

However, *thin R.C.C. structures* typically do not have the same concerns about heat buildup, and the slower rate of strength development associated with low-heat cement may be disadvantageous for these applications.

Lower Heat of Hydration.

Option D is correct.

Where the minimum dimension of the concrete to be placed at a single time is greater than 500 mm and especially where the cement content is 400 kg/m3 or more, measures to reduce the temperature such as using a material with a slower release of heat hydration should be considered. Cement generates a large amount of heat during the hydration process. Slag hydration is an exothermic reaction but it does not react as quickly as OPC and thus generates heat more slowly. Peak concrete temperatures are reduced. This is an advantage when thermal cracking would be a problem.

Blast Furnace Slag Cement (BFSC) is a good option for thin R.C.C. structures!

BFSC has:
- Lower heat of hydration
- Reduced shrinkage
- Improved durability
- Resistance to sulfate attack

It's a suitable choice for thin R.C.C. structures because it:
- Reduces the risk of cracking
- Provides better workability
- Offers improved long-term performance

So, to correct my previous response, Blast Furnace Slag Cement is a suitable option for thin R.C.C. structures, whereas Rapid Hardening Cement is the one to be avoided.

Blast furnace slag is suitable to MARINE structures as it has less heat of hydration and suited to MASSIVE constrction.

Since we used granulated blast furnace slag (pozzolona material) it has the property of HYDRAULICITY.

Hence it doesnt the correct answer.

Correct option is LOW HEAT CEMENT.

It attains slow rate of strengthening hence it is mainly suited to the construction of MASSIVE STRUCTURES it is not preferred to thin concrete works.

A blast furnace is a low-heat cement so here diff between a blast furnace and low-heat cement is clear. Blast furnace slag cement and low-heat cement are both used for dams etc massive concrete work and they give low strength in the initial days.

It should be RAPID HARDENING CEMENT because it has high heat of hydration and high shrinkage which renders it unsuitable for construction of thin RCC structures.

No guys, low heat cement is only used for thick RCC structures like dams, retaining walls, bridge abutments, etc. So that's not the correct answer.

It should be low heat cement because low heat cement has coarser particles which are not properly spread in thin RCC structure.

The correct answer is D because we only use blast furnace slag cement for thick so we will avoid it for thin RCC structures.

The Low Heat cement is correct.

It is only used for Thick RCC (dams, bridge abutments).

Not used in Thin RCC.