Fig. 4 shows the relationships between dry unit weight (γd) and
water content (WC) of the compacted 100% RAP, RAP + 20%FA blend,
and between total unit weight (γt) and L content of the compacted
RAP + 20%FA geopolymer at various NaOH/Na2SiO3 ratios. It was observed
that the γd of 100% RAP (without FA) is not sensitive to WC
(Fig. 4a) while γd of RAP + 20%FA blend tends is more sensitive to
WC and γdmax is at Optimum Water Content (OWC), indicating the
role of FA as filters on the compactability.