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This presentation will address how concrete is manufactured and what is done during that manufacturing to enhance durability of precast concrete tanks. We will examine raw material such as aggregates. Why are certain sizes and types of aggregates selected?How are they tested, and how aggregate moisture is determined for mix design adjustments. We will talk about cements.What types of portland cement are used and why.What supplementary cementitious materials are used and how do they contribute to tank watertightness and durability. We will discuss admixtures, what they do, and why certain ones may be needed for septic tanks. We will examine how mix designs are developed and why one mix design does not work for all precast applications. We will use videos to show how ingredients are batched and mixed in precise sequence and quantities. We will also talk about tank reinforcing. Why do we use rebar or welded wire fabric and determine placement. We will discuss fibers and their potential uses in precast concrete wastewater tanks.We will use video to demonstrate placement of concrete in tank forms.We will talk about proper curing of precast concrete tanks and discuss how they are stripped from the forms, inspected and made ready to deliver. A thorough and insightful look inside concrete that will help manufacturers, designers, contractors and inspectors better understand the process of delivering a product that contributes to treatment system resiliency.