, ~ Sub-or ade Rei nforcement: 2.05.1 Mate ial for Sub-Qrac e PreDaralion The materials used for Sub-grade Preparation 3hall comply with the criteria de sc ribed be low: As per tf)eSoliInvestigationReport, mostof the existing sUb-grade soils in the projectarea are loo esoils,whichlackstabilityunderwheel load. Theref ore the existing sub-grade :50ilsshould be reinforced b) two geogrid layers to gain uniformityandbondingabilityandasdirectedbythe Engineer. A Geo Composite Mode l (5540 G) will be used on top of the loose soils, then an aggregatebase course layer of minimum 30cm thick and maximum 50 mm course size will be -used,and then a scil stabilizerGeogrid(S530)will be placed above the course layerandunder theI:mbankmentand the roadstructure .The specificationsofthe twogeogr.id lay ers ar e as follows: ../ A. Geo ComPCSi~ Model (55 4OG).Specifications 1. The reinforc:ing elementshall beareinforc nggrid/fabnc composite manufactufladinaccordancewithaQualityManagement Systemwhich . complies withthe requirements BSEN ISO 9001:2000. If requiredby the Engineer, the Contractorshall provide evidence 't hatthe manufactun~r sQualityAssurance System has been certified toconform withBSENISO 9001:2000by an external authen1ica1ing authority .approved by the Department of Trade and Industry. 2. Thereinforc:inggrid lfabriccompos ite hal consist of a reinforcing grid thermally biJnde.dto eoge.ot~)ct\\~at \ht; grit \iodes. 3. The geote:xjle shallbea non-wovenn90textile manufactured from polypropylene. It shall have a mlnjmu~ mean weight (BS EN 965:1995) of 0.16 kglm It shall have a minimum CER puncture resistance of 1500N (BS EN ISO 12236:1996). Effe ctiv. opening size (000) shallhave
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