This report reviews the findings of the field studies undertaken by the Transport and Road Research Laboratory (TRRL), now the Transport Research Laboratory (TRL), on the degradation of metallic and non-metallic strips and anchors used for reinforcing soils. Different methods of assessing the degree of corrosion of metallic reinforcements are discussed and the measured rates of corrosion are compared to the current requirements of the Department of the Environment, Transport and the Regions (DETR) for both reinforced soils and corrugated steel buried structures (CSBS). Data are also provided on the loss in strength of non-metallic reinforcements. Opportunities for future work in the light of this review are also discussed. It is concluded that, at this stage, there are no grounds for changing the present requirements covering the durability of buried metallic components. However many more data than are currently available are required to establish the degree of non-uniformity of corrosion, and the relation between loss in tensile strength and loss of thickness, and how both of these vary with time and with the type of soil. The data for the non-metallic reinforcements suggest that current practice provides an adequate margin of safety against their rupture over the design life of a structure. (A)

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