Use of Construction and Demolition Waste as Aggregate: Properties of Concrete - Recycled Aggregate in Concrete - page 300

Fig. 5.57 Drying shrinkage of NAC and RCAC versus time (Domingo-Cabo et al. 2010 )

the RCA than the NA. Moreover, the shrinkage strain of concrete containing
coarse RCA with low water absorption capacity was lower than that of concrete
containing coarse RCA with higher water absorption capacity or concrete con-
taining fine RCA with higher water absorption capacity. The authors also observed
an increasing trend of long-term shrinkage strain of the RCAC as the water
absorption capacity of RCA increased (Fig. 5.58 ).
Corinaldesi ( 2010 ) reported that the 180-day shrinkage of concrete containing
NA and RCAC prepared by replacing 30 % NA by fine and coarse RCA at the w/c
ratios of 0.4-0.5 were almost the same and then shrinkage gradually increased for
the w/c ratio of 0.60 (Fig. 5.59 ). The difference in shrinkage between conventional
concrete and RCAC was also higher at low w/c ratio. On the other hand, for equal
CS, the 180-day shrinkage of RCAC containing fine and coarse RCA were
respectively 23 and 14 % lower than the conventional concrete (Fig. 5.60 ).

Fig. 5.58 10- and 90-day
shrinkage strain of concrete
with various w/c ratios
(Yang et al. 2008 )