10 wt% dry wastepaper sludge. The results demonstrate that
wastepaper sludge can absorb significant quantities of water in the
mix, causing a remarkable reduction in mortar flow properties. As
previously mentioned, nearly 52 wt% of the organic matter of the
dry wastepaper sludge is comprised of cellulose fibres (Pera and
Amrouz, 1998; Vegas et al., 2009), which are known to readily
absorb water (Yan et al., 2011; Neagu et al., 2005; Ahmadi and Al-