ACI 318-19 Changes to the Concrete Design Standard-Shotcrete

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Video Summary

The 318.19 code explicitly recognizes shotcrete as a valid concrete placement method, clarifying its inclusion in structural building codes. Shotcrete is concrete propelled at high velocity onto surfaces, differing only in application from traditional cast-in-place concrete. Its flexibility in construction, both new and in repairs, makes it economically advantageous, especially in areas where formwork is challenging, like basement or building walls. It demonstrates strong performance, comparable to cast concrete, with two main processes: dry mix, where water is added at the nozzle, and wet mix, where materials are pre-mixed. The code outlines specific requirements for reinforcement spacing, freeze-thaw exposure, and curing processes. Certified nozzle operators are essential for quality shotcrete application, with mock-up panels used to ensure skill. Test panels validate material strength and operator proficiency, maintaining standards akin to regular concrete.

Keywords

shotcrete

concrete placement

structural building codes

reinforcement spacing

certified nozzle operators