The Shotcrete Process — Wet & Dry Mix

The Shotcrete ProcessUnderstanding the science and artistry behind wet-mix and dry-mix shotcrete installation methods.OUR SERVICESVIEW PROJECTSA Century of InnovationCarl Akely invents the "cement gun" — shooting dry material through a hose with compressed air and water at the nozzle.Akely receives a patent for the installation method. The Cement Gun Company later patents the process as "gunite."Introduction of coarse aggregate to the mix creates the term "shotcrete" — a stronger, more versatile material.The rotary gun enables higher volume, more controlled dry-process installations. The wet-mix process is also introduced."Shotcrete" is the accepted industry term encompassing both wet and dry processes for precision concrete placement.Wet-Mix vs Dry-MixTwo proven methods — each with distinct advantages for different project requirementsAir-Driven PrecisionPre-dampening systems pre-wet the dry material, initiating crystallization before nozzle exit. This ensures even mixing and superior bonding when the material impacts the substrate.Large lay-down area needed for material storageProtection from weather and moisture requiredPrecise water volume monitoring at nozzleLarge CFM compressor storage spaceMay require additional labor to operateTransportable to hard-access areasConcrete mixed on demandMinimal equipment cleanup when stoppingMore maneuverable hosesPrecise patching capabilityAdmixes activated just before installationHydraulic PowerPre-mixed concrete with water is transported via ready-mix trucks, documented with batch tickets tracking material weights and mixing time. Hydraulic pumps push the material through hoses with air acceleration at the nozzle.Concrete setting time constraintsDelivery distance limitationsMaterial separation in hosesConcrete hardening in hosesDifficulty reaching hard-access areasHeavier hoses than dry processConsistent material proportionsConsistent water contentHigh daily volume placementDocumented via batch ticketsAdditional material acquired quicklyThe Right Process for Every ProjectBoth wet and dry shotcrete processes have their strengths. It is the professional shotcrete contractor that assesses the challenges of each project and determines the optimal process. Both methods deliver solid, effective concrete installation — knowing when one process suits a particular project better than another is what separates expertise from execution.5,000+PSI Mix Designs15M+Sq Ft InstalledACICertified Nozzlemen-10° to 120°FOperating Range