ANSWER $6\mathrm{.}23$

$6\mathrm{.}23$ Estimate the swelling potential of soils A$-$F$,$ Problems $2\mathrm{.}56$ and $2\mathrm{.}58.$ Use both Table $6\mathrm{.}2$ and Fig. $6\mathrm{.}21.$

$2\mathrm{.}56$ On five$-$cycle semilogarithmic paper, plot the grain$-$size distribution curves from the following mechanical analysis data on six soils; A through F$.$ For each soil determine the effective size as well as the uniformity coefficient and the coefficient of curvature. Determine also the percentages of gravel, sand silt, and clay according to $($a$)$ ASTM, $($b$)$ AASHTO, $($c$)$ USCS; and $($d$)$ the British Standard.

$2\mathrm{.}58$ The soils in Problem $2\mathrm{.}56$ have the following Atterberg limits and natural water contents. Determine the PI and LI for each soil and comment on their general activity.

$\backslash$table$[[$Property$,$Soil A$,$Soil B$,$Soil C$,$Soil D$,$Soil E$,$Soil F$],[w_n,\%,27,14,14,11,8,72],[$LL$,13,35,35,-,28,60],[$PL$,8,29,18,$NP$,$NP$,28]]$

TABLE $6\mathrm{.}2$ Expansion Potential from Classification Test Data

$\backslash$table$[[$Degree of Expansion,Probable Expansion as a Percent of Total Volume Change $($Dry to Saturated Condition$){?}^{},$Colloidal Content $(\%-1m),\backslash$table$[[$Plasticity$],[$Index$,$ PI$]],\backslash$table$[[$Shrinkage$],[$Limit$,$ SL$]]],[$Very high,$(7.)>30,>28,>35,<mn>1</mn><mn>1</mn>$