Civil Engineering Reference
In-Depth Information
Fig. 4.4 Density of two different types of hardened concrete. a Normal (Kim and Lee
2011
);
b Autoclaved aerated (Kurama et al.
2009
)
4.2.2.2 Compressive Strength
Variations in compressive strength of concrete due to the incorporation of CBA
aggregate were observed depending on the method of preparation of concrete.
Bai et al. (
2005
) observed lower compressive strength of concrete with CBA
aggregate than that of conventional concrete at constant w/c ratio, while the two
types of concrete exhibited almost similar compressive strength at constant slump
(Fig.
4.5
).
The same authors concluded that 30 % of natural sand could be replaced with
CBA aggregate to produce concrete in the 40-60 N/mm
2
compressive strength
range without detrimentally affecting the permeation and drying shrinkage prop-
erties of structural concrete. Yüksel et al. (
2011
) also observed a decreasing trend
Fig. 4.5
Compressive strength of concrete with CBA at constant w/c and slump values (Bai et al.
2005
)
