Which type of concrete is used for high-temperature applications like boilers?

Refractory concrete is specifically designed to withstand high temperatures and is thus the most appropriate choice for applications like boilers, which operate under extreme heat. This type of concrete is formulated with special aggregates and additives that provide heat resistance, ensuring structural integrity even when exposed to high levels of thermal stress.

In comparison, lightweight insulating concrete is primarily used for reducing structural load and improving insulation properties, making it unsuitable for high-temperature environments. Precast concrete is utilized for its convenience in construction but does not have the necessary thermal resistance for such applications. Architectural concrete, while aesthetically pleasing and used for design purposes, does not possess the high-temperature resistance characteristics required for boilers. Therefore, refractory concrete's unique properties make it the ideal choice for applications demanding durability under elevated temperatures.