Geogrids

A geogrid comprising an integral, mesh structure, the integral, mesh structure comprising polymeric material and comprising elongate tensile elements interconnected by junctions in the integral, mesh structure, wherein the junctions and the elongate tensile elements have a same mean thickness, the molecular orientation of the integral, mesh structure being uniform throughout an extent thereof, and

• said geogrid having a uniform thickness of 0.1 to 3 mm.

A geogrid comprising an integral, mesh structure, the integral, mesh structure comprising molecularly orientated polymeric material and comprising elongate tensile elements interconnected by junctions in the mesh structure, wherein there is no thickening of the junctions caused by stretching of the polymeric material, the molecular orientation of the integral, mesh structure being uniform throughout an extent thereof, and

• said geogrid having a uniform thickness of 0.1 to 3 mm.

A uniax geogrid comprising an integral, mesh structure, the integral, mesh structure comprising polymeric material which is uniaxially oriented, the molecular orientation of the integral, mesh structure being uniform throughout an extent thereof, and the uniax geogrid having a Creep Reduction Factor (RFCR) determined in accordance with PD ISO/TR 20432:2007 based on a Static Creep Test in accordance with BE EN ISO 13431:1999 and Stepped Isothermal Method creep testing in accordance with ASTM D6992-03 of at least 55%.

A method of producing a geogrid, the method comprising the steps of:

• (a) stretching an elongate polymeric starting sheet having a thickness of from 2 to 12 mm to form a geogrid precursor comprising molecularly orientated polymer, the geogrid precursor being of essentially uniform thickness and having a thickness of 0.1 to 3 mm, and
• (b) converting the geogrid precursor into a geogrid by forming apertures in the geogrid precursor to define an integral mesh structure formed of interconnecting mesh defining elements including elongate tensile elements, the molecular orientation of the integral mesh structure being uniform throughout an extent thereof.

A method of producing a geogrid, the method comprising the steps of:

• (a) providing a geogrid precursor as a polymeric starting sheet comprising polymeric material uniformly molecularly orientated throughout an extent of the sheet, the geogrid precursor being of essentially uniform thickness and having a thickness of 0.1 to 3 mm, and
• (b) converting the geogrid precursor into a geogrid by forming apertures in the geogrid precursor to define an integral mesh structure formed of interconnecting mesh defining elements including elongate tensile elements, the molecular orientation of the integral mesh structure being uniform throughout an extent thereof.