Civil Engineering Reference
In-Depth Information
Fig. 5.61 Relationship
between CS and drying
shrinkage (Kou and Poon
2008
)
Depending upon their hydration behaviour, mixing mineral additions with
cement has positive or negative effect on the drying shrinkages of concrete con-
taining RCA. Regardless of the replacement ratio of coarse NA by RCA, Kou et al.
(
2011b
) reported that the drying shrinkages of concrete containing SF and MK as
10 and 15 % replacement of OPC was higher than that of the conventional con-
crete due to the formation of a higher amount of calcium silicate hydrate gel. On
the other hand, the drying shrinkage of concrete containing FA and ggbfs was
lower than that of the conventional concrete due to the lower hydration rate of FA
and ggbfs as well as the restraining effect of unhydrated powder in cement paste.
Their results are presented in Fig.
5.62
.
Fig. 5.62 Drying shrinkage of concrete containing 0-100 % of coarse RCA and various mineral
additions (Kou et al.
2011b
)
