- Natural masonry blocks/Bricks are
produced hydraulically using an Earth Block press. A wide range of
soils can be used for the production of these blocks with the key
ingredients being clay and sand. These blocks are laid in standard
masonry fashion and can be laid in mortar, a clay slurry, or dry
stacked.
- Soils suitable for block/bricks making
require a clay content between 15-30% with the remainder being
primarily sand and silt. If a soil is too high in clay or sand, it
can be amended with the addition of sand or clay respectively.
Sometimes the soil requires screening if there is large aggregate
like rocks present. Organic matter is not used for block production,
so the precious topsoil can be used for growing flowers, grass, or
veggies.
- Prior to block making the soil is
prepared by mixing in a stabilizer such as lime, RHA and other
materials available
- The soil mixture is dumped into the
hopper of the block machine with a front-end loader. It feeds into a
4” x 14” mold in which the soil is hydraulically pressed from two
sides. The block width can quickly be adjusted for sizes between
2-10 inches to meet architectural needs.
- Blocks require a minimum of two weeks
curing time during which they are covered to maintain high humidity
and temperature.
- Once curing is complete, the
bricks/blocks have a compressive strength of approximately
700-1,500 pounds per square inch. These blocks are load-bearing, and
are
appropriate for above grade/ground exterior and interior wall
construction. On the exterior earth blocks are finished with a
stucco, plaster, render, or even siding.
- The soil, raw or stabilized, for a
compressed earth block is slightly moistened, poured into a steel
press (with or without stabiliser) and then compressed either with a
manual or motorized press and can be compressed in many different
shapes and sizes.
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