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Shotcrete is an all-inclusive term for spraying concrete or mortar with either a dry or wet mix process. However, shotcrete may also sometimes be used to distinguish wet-mix from the dry-mix method. The term shotcrete was first defined by the American Railway Engineers Association (AREA) in the early 1930s. [6]
The volumetric mixer varies in capacity size up to 12 m 3 and has a production rate of around 60m 3 an hour depending on the mix design. Many volumetric concrete mixer manufacturers have innovated the mixer in capacity and design, as well as added features including color, multiple admixes, fiber systems, and the ability to do gunite or shotcrete.
There are two application methods for shotcrete. dry-mix – the dry mixture of cement and aggregates is filled into the machine and conveyed with compressed air through the hoses. The water needed for the hydration is added at the nozzle. wet-mix – the mixes are prepared with all necessary water for hydration. The mixes are pumped through ...
Mix unique to ICON that is integrated with their Magma feeding system and Vulcan printers [22] LafargeHolcim: Switzerland: Tector 3D Build: The first dry mortar product for 3D printing with strengths up to 90 MPa [31] CEMEX: Mexico: D.fab: Has a CO2 footprint 1.5 times lower than mortars typically used in 3D printed concrete available on the ...
Putzmeister was founded by Karl Schlecht in 1958. [3] Schlecht designed a mortar machine based on his diploma thesis at the University of Stuttgart. [4]In 1986, Putzmeister 52Z's were used in the Chernobyl nuclear accident, pumping over 300,000 m 3 (390,000 cu yd) of concrete to entomb reactor number 4, setting a world record at the time for volume pumping.
A typical concrete mixer uses a revolving drum to mix the components. For smaller volume works, portable concrete mixers are often used so that the concrete can be made at the construction site, giving the workers ample time to use the concrete before it hardens. An alternative to a machine is mixing concrete by hand.
It is mainly composed of elevator, premix bin, stock bin, mixing engine, finished product warehouse, automatic packing machine, dust collector and electric control cabinet. Dry mortar mixer can be vertical or horizontal type and there are many models for choosing according to customer's actual conditions.
Dry mix plants typically see more break strength standard deviation and variation from load to load because of inconsistencies in mix times, truck blade and drum conditions, traffic conditions, etc. With a central mix plant, all loads see the same mixing action and there is an initial quality control point when discharging from the central mixer.