Figs. 8–10 show the stress–strain relationships in unconfined compression
tests of samples with different air contents and cement contents
but with the same V/C values of 30 and 10, at 14 days of curing.
Fig. 8 is for the lightweight cemented kaolin at water content of 88%.
Fig. 9 is for the lightweight cemented Bangkok clay at water contents
of 136 and 241%. Fig. 10 is for the lightweight cemented bentonite at
water contents of 170 and 280%. It is noted that as V/C decreases, the cementation
bond strength increases and hence the strength. The lightweight
cemented samples with the same void/cement exhibit the
similar stress–strain behavior. To conclude, V/C controls compressive
strength and compression characteristic in pre-yield state for a particular
water content, while the unit weight does not, which is different
from natural clays.