The correct answer is D. All of the above.
Low heat cement is a type of cement that produces less heat during hydration than ordinary Portland cement. This makes it a good choice for use in structures that are sensitive to heat, such as nuclear power plants and bridges.
Low heat cement is made by adding a pozzolanic material, such as fly ash or silica fume, to ordinary Portland cement. These pozzolanic materials react with water to form cementitious compounds that produce less heat than the cement itself.
Low heat cement has several advantages over ordinary Portland cement. It produces less heat, which can reduce cracking and other damage to structures. It also has a slower setting time, which gives workers more time to place and finish concrete. And it has a higher resistance to sulfate attack, which can cause concrete to deteriorate.
However, low heat cement also has some disadvantages. It is more expensive than ordinary Portland cement. It also has a lower compressive strength, which means that it is not as strong as ordinary Portland cement. And it is more difficult to work with, as it has a higher water demand.
Overall, low heat cement is a good choice for use in structures that are sensitive to heat. However, it is important to weigh the advantages and disadvantages of low heat cement before using it in a particular project.
Here is a brief explanation of each option:
- Option A: Low heat cement possesses less compressive strength. This is because the pozzolanic materials added to low heat cement react with water to form cementitious compounds that are not as strong as the cement itself.
- Option B: Its initial setting time is about one hour. This is because the pozzolanic materials added to low heat cement slow down the hydration process.
- Option C: Its final setting time is about 10 hours. This is also because the pozzolanic materials added to low heat cement slow down the hydration process.