What are the primary components of cementitious materials used in fireproofing?

The primary components of cementitious materials used in fireproofing are cement, aggregates, and additives. Cement acts as the binding agent that hardens and strengthens the material, providing essential structural integrity. Aggregates, which can include various types of sand and gravel, contribute to the bulk and improve the physical properties of the mixture. Additives are included to enhance specific characteristics, such as fire resistance, workability, and curing properties.

In fireproofing applications, these components work together to create a material that can effectively insulate structural elements from high temperatures and improve their overall fire resistance. The combination ensures that the fireproofing layer adheres well and provides the necessary protective qualities required for safety in building designs. This composition is fundamental to ensuring that the fireproofing meets code requirements and performs adequately under fire conditions.

The other choices refer to materials that do not generally constitute cementitious fireproofing. For instance, PVC and resins, while they are used in some fireproofing materials, are not the primary constituents of traditional cementitious fireproofing. Sand, clay, and water are part of some construction mixtures but do not encompass the full scope of cementitious fireproofing materials.