Technical Resources National Precast Concrete Association / Plant Resources / Contact Technical Department / Technical ResourcesThe following technical publications are free to use. Additional resources on the precast concrete industry are available for NPCA members. Looking for technical resources specific to certain products? Please visit the Precast Products page. Guide to Hiring an Engineer or ConsultantBuoyancy White PaperBuoyancy Calc. - Rectangular and Round StructuresBuoyancy Soil Values Reference SheetGuide to Implementing Self Consolidating ConcreteExample Ready-Mix Batch Ticket CalculatorTechBrief: Air-Entraining AdmixturesTechNote: Concrete Sampling and TestingTechNote: Proper Application of Form ReleaseTechNote: Wet-Cast Curing PropertiesTechNote: Water-Reducing AdmixturesNPCA Fibers White PaperFiber Reinforcement Best PracticesWhite Paper on Ultra-High Performance ConcreteManhole Sizing Recommendations