Shotcrete is concrete (or sometimes mortar) conveyed through a hose and pneumatically projected at high velocity onto a surface, as a construction technique. Shotcrete is usually an all-inclusive term that can be used for both wet-mix and dry-mix versions. In the pool construction trade however, the term "shotcrete" refers to wet-mix and "gunite" refers to dry-mix; in this context, these two terms are not interchangeable. Shotcrete undergoes placement and compaction at the same time due to the force with which it is projected from the nozzle. It can be impacted onto any type or shape of surface, including vertical or overhead areas.
SCCA works with California local ACI chapters in administering the ACI Shotcrete Nozzleman Certification program which includes both classroom education and practical field education including a Concrete specific Safety class. Contact Shotcrete Concrete Contractors for session dates.
Which may include project specific mock-up's which would demonstrate quality control this would verify the capabilities of the Nozzleman including the support needed by the Contractor.
Starting in the mid 1950’s wet mix Shotcrete was introduced to the construction industry – these primitive attempts proved to be very beneficial to the industry, thru the 1970’s numerous structures have been constructed with Wet Mix Concrete using the Shotcrete process as means and method to place the concrete.
In the early 1980’s the Concrete Industry takes a big step in the quality for mixing and batching ready mixed concrete, computer controlled ready mix plants are installed. Admixtures have become common and proven to increase the placement and durability of the concrete. The equipment used in the Shotcrete (wet mix concrete process) has changed full circle from the start in the mid 50’s.
Today's state of the art equipment is capable of pumping any slump and used in long distance tunnel projects as well as high rise concrete construction.
Material is generally delivered with Ready- mix trucks per ACI 318 - ASTM C94 Standard specification for ready mixed concrete. The Aggregates are a combination of coarse and fine aggregates per ASTM C-33. Concrete is pumped thru a system with air-injected at the nozzle to increase velocity and improve the placement of the concrete. The concrete being placed may be vibrated and placed with or without the nozzle in congested and horizontal applications.
Copyright © Shotcrete Concrete Contractors Association. All rights reserved.