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CALL *******5950 Show number
Price NZD $100,000
Listing Type Used
Refcode DIY1118081

This process is designed to make blocks where a structure is to be built, eliminating material transport costs.
The raw material for the production of Cement Stabilised Compressed Earth Blocks is primarily sub soil earth, the earth must be free of vegetable matter, and consistent in its nature.
Taranaki sub soils are primarily products of layers of volcanic ash, they are friable (easily broken down into smaller and finer particles) consistent in make-up, and under pressure they have an extremely high angle of repose. Clear evidence of this is seen throughout the province where roads have been cut into a hillside, banks remain vertical.
Dry bulk cement is added to the subsoil at a rate of 10-15%, and the natural moisture in the sub soil sets off the chemical reaction of the cement, binding with the soil under the pressure created within the press.
Moisture content in Taranaki sub soils is generally not a problem as they are usually damp. A simple test for suitable condition of sub soil is to squeeze a handful of soil into a ball and drop it from waist height. If the soil scatters upon impact the soil is too dry, if it tends to stay together in large pieces, the moisture content is sufficient to initiate the cement reaction.
New Zealand has a standard for using earth as a medium for building, so an initial run of blocks is used for the tests described in NZS 4297 (Materials and workmanship for Earth Buildings), and building techniques and methods must comply with NZS 4298 (requiring specific design) and 4299 (Not requiring specific design). 30 days drying time is required before the blocks can be laid in the direction of compression.

The equipment includes the following:

(Photo#1) David Brown 990 Diesel Tractor. Complete with hydraulic bucket with crowd ram, hydraulic fork lift, and power steering.
The tractor is used to reduce manual handling of raw material and finished product. Sub soil earth is tipped into a hopper and delivered to a rotating hydraulically driven tumble sieve to assist in supplying a consistent product to the compressing machine.

The first hopper (photo 2) has grating to prevent large objects getting through and also to act as a barrier in the unlikely event that someone would try and access it during operation. The auger is hydraulically driven and delivers sub soil to the rotating tumble sieve at the required rate.

The tumble sieve (photo 3) is in line with the auger and ensures that a consistently sized raw material is delivered to the compressing machine.

The conveyor (photo 4), delivering sub soil to the top of the compressing machine is also hydraulically driven, however the motor is independent of the tumble sieve, so the delivery rates can be adjusted appropriately.

The hydraulic power (photo 5)for the hopper/sieve and the conveyor is produced by an air cooled two-cylinder Deutz diesel, fully reconditioned, with two hydraulic pumps matched to the motors on the hopper/sieve, and the conveyor.

The heart of the process is the portable press (photo 6) mounted on a Tandem axle trailer. It is designed for small scale on-site production of compressed stabilised earth blocks. It is driven by a four-cylinder diesel engine which in turn drives the hydraulics. A small computer or CPU directs the operation. The machine is fully automated and can be operated by 2-3 people
The machine has a cycle capacity of approximately 2 cycles per minute, therefore 2 blocks per minute when all conditions for successful block making are met.
The designed overall size of the produced block is 135 mm X 135 mm X 285 mm. This is intended to make a block that makes a double block wall of 320 mm width with a 50 mm void space.
The blocks are adjustable on one plane, and can be reduced down from 135 to 90 mm if desired.
The machine is a complete system with sub soil loaded into the large hopper and dry cement loaded into the smaller one.
The machine ratios product according to a desired recipe and is currently set at 8-1 soil to cement. This is done by rotary valves with the soil and cement mix dropping down onto a high-speed flail mill which pulverises the soil to finer particles as well as mixes the dry cement with the soil.
The mixture is then picked up by a broken fluted auger which continues the mixing action and delivers the mix to a metering bin above the compression chamber. A proximity switch in the metering box triggers the mixing and loading process, turning rotary valves on and off as the machine requires A Just in Time process.
The compression chamber is filled, the gate shuts, the block is pressed, the exit gate opens, and the block is ejected. The block is hard enough to be stacked on a pallet ready for curing. The blocks are solid within 2-3 days but require 28 days to cure. They should be protected from the weather during this time.

Cement is added through a smaller hopper, and the two raw materials are mixed through rotating valves which deliver measured amounts of each. These combined products fall through a high-speed rotating flail mill and drop onto a fluted auger which delivers the combined and mixed raw materials to a metering box.

When the metering box is filled with material, a paddle switch initiates a proximity switch sending a signal to the CPU, the delivery side of the compressing machine stops. A slide door opens allowing the product in the metering box to drop through to the compression chamber, the slide door closes, which allows the delivery side to begin again and simultaneously the compression ram engages and compresses the product to 2000 psi. A pressure switch causes the ram to stop, a gate opens to allow the formed block to be pushed out, the ram extends further ensuring the newly formed block is completely out, and then the ram fully retracts, the gate closes, the metering box fills and so on and so on.

The blocks are stacked on a pallet, which is picked up by the forklift on the tractor and deposited around the building site. The pallets of blocks are stored according to the standard and after 30 days can be laid in the direction of compression
This machine has built blocks for 5 houses in Opotiki, using a double block method of wall building, using brick ties and reinforced columns within the void space at specified intervals, primarily wherever there is a door or window. The columns have reinforcing bar that is tied back to the block courses, the columns are boxed as the courses are laid and poured with concrete once the height of the wall is reached, Boxing is only necessary on two sides and can remain in place if required.
The operation of the machine requires two -three people. Theoretically the machine can produce 120 blocks per hour, however realistically 600 blocks per day can be expected.

These blocks were made in Taranaki in 2021 using local sub soil. That was available at the site of storage of the machine.
The last time a machine like this was advertised in NZ, the asking price was $100,000, and it didnt include a hydraulically driven delivery system. This complete system is for sale. It has been 90% refurbished and is operating correctly.

The information contained within classified listings on is generated by the private and dealer advertisers. Please confirm listing details including price and specifications directly with the seller.

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Hillsborough, Taranaki
New Zealand

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