Fig. 1 The materials used in the
concrete mixes
Table 1 Properties of the aggregates used in the concrete mixes
Properties
NCA (20–5 mm)
NFA (5–0.15 mm)
RCA (14–5 mm)
CFA (5–0.15 mm)
Specific gravity
2.61
2.67
2.76
1.89
Fineness modulus
–
3.27
–
2.66
Abrasion value %
31
–
20
–
Water absorption %
2.8
4.17
4.1
6.56
Moisture content %
0.9
1.3
1.3
2.6
Compacted bulk density t/m
3
1.41
–
1.47
–
Table 2 Mix code and their
descriptions
Mix-code
Mix description
M0
100% OPC-100% NFA-100% NCA-Water-Plasticizer
MRA100
100% OPC-100% NFA-100% RCA-Water-Plasticizer
MRA100-CFA20
100% OPC-80% NFA-20% CFA-100% RCA-Water-Plasticizer
MRA100-CFA20-CWP20
80% OPC-20% CWP-80% NFA-20% CFA-100% RCA-Water-Plasticizer
Table 3 Mix proportions
Mix-code
Materials (kg or L/m
3
)
OPC CWP NCA
20
mm
NCA
10
mm
RCA
14
mm
NFA CFA Water Plasticizer
M0
400
–
740
250
–
840
–
132
5
MRA100
400
–
–
–
827
995
–
132
5
MRA100-CFA20
400
–
–
–
827
796
199
132
5
MRA100-CFA20-CWP20 320
80
–
–
827
796
199
132
5
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