Soil Density - Standard vs Modified Proctor

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2003 Keystone Retaining Wall Systems912/30/03Soil Density - Standard vs Modified ProctorReinforced soil structures routinely specify that all soils be compacted to 95% of the maximumdensity determined by ASTM D698 - Standard Proctor Densityfor conformance with thedesign. However, Standard Proctordensity criteria is typically utilized in the Eastern US where-asModified Proctordensity criteria is typically utilized in the Western US which can createsome conflicting specification has been done showing the relationship betweenStandardandModified Proctordensi-ty testing for different soils types as indicated below:140130120110100908070 , water content in %05101520253035A1B1C1A2B2C2A3B3C3A- Modified ProctorB- Standard ProctorC- 15 blow ProctorSoil 2(Sand) soil 1(Silty Sand)So il 3(Clay)Moisture- Density Relationships(Ref.)

Soil 2 - Sand 113 110 108 ind ind ind Soil 3 - Clay 102 88 83 20 28 31 Summary of Data Type Standard 95% Standard % of Modified Soil 1 - Silty Sand 125 119 90% Soil 2 - Sand 110 105 93% Soil 3 - Clay 88 84 82% 95% Standard vs Modified Proctor Comparison It is obvious from this limited data that a simple conclusion can not be drawn but some general

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