What is a key advantage of using a steel stack over a reinforced concrete stack?

The choice indicating that using a steel stack has a lower cost is correct due to several factors associated with the materials and construction methods involved. Steel is often less expensive as a raw material compared to reinforced concrete, leading to reduced initial costs for manufacturing and installation. Additionally, the processes for fabricating steel stacks can be more streamlined and efficient compared to those required for constructing reinforced concrete stacks, which may involve longer curing times and more complex forms and scaffolding.

Steel stacks can also often be erected more quickly, which can contribute to savings in labor costs and project timelines. While reinforced concrete offers great strengths, weather resistance, and thermal mass, the initial financial outlay for steel is generally lower, making it a more cost-effective option in many scenarios.

The other aspects of durability and maintenance are more nuanced, as they can vary significantly based on environmental factors, design, and specific applications. Steel stacks often require protective coatings to resist corrosion, which can introduce additional maintenance considerations over time, while reinforced concrete provides inherent resistance to certain types of environmental damage but may be more expensive initially.