What does PCI MNL-130 refer to?

PCI MNL-130 specifically focuses on guidelines for Glass Fiber Reinforced Concrete (GFRC), detailing the design, manufacturing, and installation processes unique to this material. GFRC is known for its durability, lightweight properties, and aesthetic versatility, making it an important subject within the precast concrete industry. The guidelines provided in PCI MNL-130 ensure that the standards for quality and performance are upheld during the use and application of GFRC in various construction projects.

The other options pertain to different aspects of concrete and precast systems but do not align with the specific focus of PCI MNL-130. For example, the standard manual for precast concrete installation and the quality system manual for concrete testing cover broader topics or different materials, while the standard practice for sampling concrete relates specifically to sampling procedures, rather than detailing the specific considerations for GFRC. This distinction solidifies why C is the correct choice regarding PCI MNL-130.