Use of Industrial Waste as Aggregate: Properties of Concrete - Recycled Aggregate in Concrete - page 122

Fig. 4.9 Splitting tensile strength of normal and CBA concrete (Ghafoori and Bucholc 1996 ).
a Cement content: 500 lb/yd 3 ; b Cement content: 600 lb/yd 3

Table 4.2 Modulus of elasticity of different types of concrete (Ghafoori and Bucholc 1996 )
Cement content (lb/yd 3 ) Modulus of elasticity, (psi) of concrete (9 10 6 )

C CBA ADM1 ADM2

500 5.02 3.32 3.64 3.83

600 5.58 3.80 4.04 4.36

700 5.80 3.86 4.32 5.05

800 5.74 4.25 4.47 5.20

Details about concrete mix proportions are presented in Table 4.1

aggregate. Their results are presented in Table 4.2 . The authors achieved a sig-
nificant improvement of the modulus of elasticity for CBA concrete by using a
higher amount of cement along with the addition of an admixture.
Kim and Lee ( 2011 ) also observed a similar modulus of elasticity of high-
strength concrete (HSC) prepared by replacing 50 % by volume of aggregate with
CBA, beyond which it dropped quickly (Fig. 4.10 ). The authors observed a higher
reduction in the modulus of elasticity using coarse CBA aggregate than for fine
CBA. The reduction in modulus of elasticity of concrete due to 100 % replacement
of fine natural aggregate (NA) by fine CBA was about 15 %, whereas these values

Fig. 4.10 Modulus of
elasticity of concrete with
various amounts of CBA
aggregates (Kim and Lee
2011 )