Precast concrete products. General rules for factory production control of glass-fibre reinforced cement|Mixing, Quality assurance, Glass fibres, Type testing, Cements, Sampling methods, Precast concrete, Performance testing, Construction materials, Mechanical testing, Raw materials, Concretes, Water-absorption tests, Certification (approval), Batch production, Storage, Management operations, Environmental testing, Records (documents), Personnel, Reinforcing materials, Sand, Composite materials, Quality control, Process control, Production, Additives, Reinforced materials