What percentage of heat does Type III cement produce compared to Type I cement during the first seven days?

Type III cement, often referred to as high-early-strength cement, is designed to achieve strength more quickly than Type I cement, allowing for faster construction turnaround. During the first seven days of curing, Type III cement generates a higher amount of heat due to its chemical composition and increased surface area, which accelerates the hydration process.

When comparing the heat produced, Type III cement generates around 40-60% more heat than Type I cement in that critical initial week, making it a suitable choice for projects requiring early strength gain. This characteristic is beneficial in environments where swift construction is required or in colder climates where faster hardening can mitigate issues related to low temperatures, such as freezing.

The other options reflect percentages that either exceed realistic values for heat production or are not applicable within the context of comparing these two types of cement's performance in the early stages of curing. Therefore, selecting the range of 40-60% accurately reflects the expected thermal output of Type III cement relative to Type I during the first seven days.