Abstract
An analytical and experimental investigation is made on the compression index equation for remolded clays.
Choosing plasticity index Ip and liquidity index IL as indices for sort and condition of clays and using Ip×IL (= w0-wp) as a parameter, compression index for remolded clays Cc' is expressed by the following function, Cc' = F (w0-wp), where w0 and wp are initial water content and plastic limit, respectively.
Since the relationship between water content w and void ratio e for perfectly saturated clays is expressed as w = 100eρw/ρs, and Gs=ρs/ρw, where ρw, ρs and Gs are density of water, density of soil particle and specific gravity of soil particle, respectively, Cc'-(w0-wp) relationship can be transformed as Cc'= F [(e0-ep)/Gs], where e0 and ep are initial void ratio and void ratio at plastic limit, respectively. The above equation can be expressed simply as Cc' = F (e0-ep).
Experimental equation C, ' applicable to sorts of remolded clays is given for each parameter as follow:
1. For (w0-wp): Cc'=0.007 (w0-wp) +0.099 (coefficient of correlation γ= 0.981), or
Cc'=0.700 [(e0-ep)/ Gs] + 0.099
2. For (e0-ep): Cc' = 0.302 (e0-ep) + 0.064 (γ=0.976)
