A mobile volumetric concrete mixing system includes a suction system that vacuums up trench spoils while a trench is being cut. These trench spoils are then screened on-site for particle size to be reused and mixed with water, cement, and/or other admixtures at an auger mixer to form a backfill mixture. This backfill mixture may then be loaded into a hopper that continuously agitates the mixture so that the mixture does not harden before pouring. The agitating hopper is coupled to a discharge chute of the auger mixer and includes one or more augers disposed at various orientations that the backfill mixture is channeled through. From the agitating hopper, the backfill mixture is channeled to an applicator that moves along the trench and that enables the mixture to be quickly poured into the trench with little clean-up required.

There is provided an apparatus (100) for manufacturing a cementitious slurry comprising foam, the apparatus (100) comprising: a mixing chamber (101) for mixing a cementitious material and water to form a cementitious slurry, a channel (103) fluidly connected to the mixing chamber (101) at a first end (111), the channel (103) for receiving the cementitious slurry from the mixing chamber (101), the channel (103) extending from the first end (111) and terminating at a second end (112); the channel (103) comprising a foam inlet (106) for introducing foam into the channel (103); wherein the channel (103) comprises a mixing cross section, the mixing cross section comprising a first dimension and a second dimension; the first dimension perpendicular to the second dimension; the first dimension being longer than the second dimension; wherein the foam inlet (106) is configured to introduce foam into the channel (103) in a direction generally parallel to the second dimension. A channel (103) for a cementitious slurry and a method are also provided.

There is provided an apparatus (100) for manufacturing a cementitious slurry comprising foam, the apparatus (100) comprising: a mixing chamber (101) for mixing a cementitious material and water to form a cementitious slurry, a channel (103) fluidly connected to the mixing chamber (101) at a first end (111), the channel (103) for receiving the cementitious slurry from the mixing chamber (101), the channel (103) extending from the first end (111) and terminating at a second end (112); the channel (103) comprising a foam inlet (106) for introducing foam into the channel (103); wherein the channel (103) comprises a mixing cross section, the mixing cross section comprising a first dimension and a second dimension; the first dimension perpendicular to the second dimension; the first dimension being longer than the second dimension; wherein the foam inlet (106) is configured to introduce foam into the channel (103) in a direction generally parallel to the second dimension. A channel (103) for a cementitious slurry and a method are also provided.

According to the present invention, there is provided an apparatus (100) for manufacturing a cementitious slurry comprising foam, the apparatus comprising: a mixing chamber (101) for mixing a cementitious material and water to form a cementitious slurry, a channel (103) fluidly connected to the mixing chamber (101) at a first end (111), the channel (103) for receiving a cementitious slurry from the mixing chamber (101). In the apparatus (100), the channel (103) extends from the first end (111) and terminates at at least one second end (112). The channel (103) comprises a first foam inlet (106) for introducing foam into the channel (103). The channel (103) further comprises a second foam inlet for introducing foam into the channel (103). The first foam inlet (106) and the second foam inlet are offset along the length of the channel (103). A method using the apparatus (100) is also described.

According to the present invention, there is provided an apparatus (100) for manufacturing a cementitious slurry comprising foam, the apparatus comprising: a mixing chamber (101) for mixing a cementitious material and water to form a cementitious slurry, a channel (103) fluidly connected to the mixing chamber (101) at a first end (111), the channel (103) for receiving a cementitious slurry from the mixing chamber (101). In the apparatus (100), the channel (103) extends from the first end (111) and terminates at at least one second end (112). The channel (103) comprises a first foam inlet (106) for introducing foam into the channel (103). The channel (103) further comprises a second foam inlet for introducing foam into the channel (103). The first foam inlet (106) and the second foam inlet are offset along the length of the channel (103). A method using the apparatus (100) is also described.

There is provided an apparatus (100) for manufacturing a cementitious slurry comprising foam, the apparatus (100) comprising: a mixing chamber (101) for mixing a cementitious material and water to form a cementitious slurry, a channel (103) fluidly connected to the mixing chamber (101) at a first end, the channel (103) for receiving the cementitious slurry from the mixing chamber (101), the channel (103) extending from the first end and terminating a second end; the channel (103) comprising a foam inlet (106) for introducing foam into the channel (103); wherein the portion of the channel (103) between the foam inlet (106) and the second end has a length from 400 mm to 1200 mm inclusive, wherein said foam inlet (106) is positioned such that the distance between said first end of said channel (103) and said foam inlet (106) is less than 25% of the distance between said first end of said channel (103) and said second end of said channel (103). A cementitious slurry channel (103) and a method of manufacturing a cementitious slurry are also provided.

There is provided an apparatus (100) for manufacturing a cementitious slurry comprising foam, the apparatus (100) comprising: a mixing chamber (101) for mixing a cementitious material and water to form a cementitious slurry, a channel (103) fluidly connected to the mixing chamber (101) at a first end, the channel (103) for receiving the cementitious slurry from the mixing chamber (101), the channel (103) extending from the first end and terminating a second end; the channel (103) comprising a foam inlet (106) for introducing foam into the channel (103); wherein the portion of the channel (103) between the foam inlet (106) and the second end has a length from 400 mm to 1200 mm inclusive, wherein said foam inlet (106) is positioned such that the distance between said first end of said channel (103) and said foam inlet (106) is less than 25% of the distance between said first end of said channel (103) and said second end of said channel (103). A cementitious slurry channel (103) and a method of manufacturing a cementitious slurry are also provided.

A modular concrete production system includes individual units for the production of concrete that may be individually transported to a construction site and set up for on-site concrete production. The system includes a portable concrete mixing unit, a portable power supply unit, and a portable water supply unit. The system also includes modular bins for cement and aggregate. The bins are pre-loaded with cement and aggregate off-site and then transported to the work site for use. The bins can be stacked onto hoppers to supply cement and aggregate to a concrete mixer on the concrete mixing unit and then replaced when the contents of the bins are depleted to operate the mixer continuously.

An agitator for a gypsum wallboard mixer is provided and includes a circular disc with an upper surface, a drive shaft extending vertically from the upper surface, a lump ring secured to the upper surface, the lump ring being provided in a plurality of spaced, adjacent arcuate segments.

A three-dimensional printing head including a dynamic mixer comprising a mixer casing, which delimits a mixing chamber, a supply inlet configured to supply the mixing chamber with a mineral composition and a discharge outlet; and an injector for injecting a building material admixture in the mixing chamber. The injector includes a tubular injecting member being flexible and having an injection outlet, the tubular injecting member being elastically deformable between a first state in which the tubular injecting member is configured to allow a flow of the building material admixture through the tubular injecting member and towards the injection outlet, and a second state in which the tubular injecting member is configured to prevent a flow of the mineral composition from the mixing chamber and through the tubular injecting member.