Question

Compaction 1. Why do we compact soils to 90 or 95% Standard Proctor (.e. maximum dry unit weight) instead of 100% Standard Proctor? 2. At what saturation is the theoretical minimum void ratio achieved? 3. The following data were determined from a compaction test for a soil with a specific gravity of solids = 2.65 Water content Total Unit Weight (lb/ft) 10 98 106 119 125 128 124 119 (%) Graph the compaction curve (dry unit weight versus water content), and find the maximum dry unit weight and optimum water content. Plot the zero air voids curve. If the contractor is required to achieve 90% compaction, what is the range of water contents that is acceptable?

Answer 1

Water content Bulkdensity Dry unit weight 100 % saturation 98 89.09090909 130.7193676 106 93.80530973 122.9899591 119 102.5862069 116.1235955 125 105.9322034 111.9566689 128 106.6666667 108.0784314 124 101.6393443 104.4598863 119 95.2 99.46466165

130.7193676 122.9899591 06.1235955 211.9566689 199 0784314 208.6666667 density in /b/ft 3 105.9322034 104.4598863 102.5862069 102.6393493 99,45466265 95 2 93.80530973 89.09090909 woter content in %

Blue line = Max. Dry density line

Orange line = 100% saturation or Zero air voids line

17 By this you mean 95% relative Compaction. It is the field tested matered after placement and Subgrade improumat must have a density equal on greater than 95% of the laborebry density as determined using standard proctor. for eg: Af Standard procka dusity of material is 121. 7 pcf in the lab, At's field dersity should meet an exceed 115.6 pcf ( 95%, compaction) in the field it is imposible to obtain the max dry dersity Cortes- ponding to 100% as Obrained in laborlelory test. 2 we know that emin = 0.35 (theoritical resuelt) But se= wg (i G = sp.gravity = constart) E is = w for 100% saturation, the theoritical min, vid retio is achieud. 37 from graph max, day wit hot (rd) max = 107 lb / ft² optimum water content = 19.5% for 90% compaction the acceptable reye of water is. 13,9% to 94% water content Corresponding to (rd ± 10%)

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