PP Biaxial Geogrid

What a PP biaxial geogrid is

A biaxial geogrid starts life as a solid polypropylene sheet. The sheet is punched with a regular pattern of holes, then drawn in the machine direction and again across it. Drawing aligns the polymer chains along every rib, so the finished polypropylene geogrid is far stiffer and stronger than the sheet it came from, while the junctions where ribs meet are never cut or joined — they are part of the original sheet. That is why this type is also called an integral or bidirectional geogrid, and why its junction efficiency is rated at 93% rather than the lower figures typical of bonded or knitted constructions.

How it stabilizes a subgrade

Lay the grid on a prepared subgrade and place aggregate over it, and stone particles push down into the square apertures and lock there. Once confined, the fill can no longer spread sideways under a wheel load, so the layer behaves as a stiffer slab and spreads pressure over a wider area of soft soil below. This is the whole mechanism behind geogrid subgrade stabilization: less rutting, a higher effective bearing capacity, and in most designs a measurably thinner base for the same service life. Because the reinforcement acts in both directions, it suits wide areas — yards, platforms, formation layers — as much as linear works.

Grades and how to pick one

Seven standard grades cover 15-15 to 50-50 kN/m ultimate tensile. Designers rarely work from the ultimate figure, though: the load a stabilization layer actually sees keeps strain small, so the tensile strength at 2% and 5% strain is the number that matters, and we publish both for every grade. As a rough guide, 15-15 and 20-20 suit light-traffic access roads, car parks and landscaping platforms; 30-30 is the common highway and yard grade; 40-40 through 50-50 go under heavy axle loads, container handling and railway formation. A 35-35 grade and a large-aperture 57 × 57 mm range are available on request where coarse fill needs a bigger opening to interlock.

Geogrid for roads and other jobs

Most of what we ship is geogrid for road construction — a single layer at the subgrade interface, sometimes a second within the base. It also goes into unpaved haul and gravel roads, embankment bases, and load-transfer platforms over piles. For geogrid for soil stabilization on weak or waterlogged ground, pair it with a separation fabric: our woven geotextile keeps the aggregate out of the soft soil while the grid supplies the tensile restraint, and a nonwoven geotextile is used where filtration and drainage matter more than strength.

Not the same as a ground grid or gravel grid

Buyers in North America often say "geo grid" when they mean the honeycomb cellular panels used to hold gravel or grass in a driveway. Those are a different product with a different job — the cells hold surface material in place from above, rather than reinforcing a structural layer from within. If that is what you are after, go to our gravel grid panels or the deeper HDPE geocell used for confinement under load. A biaxial geogrid is the flat mesh that goes under the base course.

Supply, rolls and the rest of the range

Rolls come 3.95 m or 5.95 m wide by 50 m long, with 75 m rolls on the 15-15 grade; a 40HC container takes roughly 180 rolls of 15-15 or 90 rolls of 40-40, so shipping cost per square metre stays low on export orders. Where reinforcement is only needed in one direction — retaining walls and steep slopes — use our uniaxial geogrid. For asphalt overlays there is fiberglass geogrid, for high-strength flexible reinforcement polyester geogrid, and for soft-soil embankments steel-plastic geogrid. The full product range lists the geotextiles and drainage materials that go with them.