Page 234 - New Trends in Eco efficient and Recycled Concrete

202 New Trends in Eco-efficient and Recycled Concrete

20% Yang05 A
Change tensile resistance at 7 days (%) –10% Yang05 B
10%

0%
Nguyen VA

Nguyen VB
Nguyen CA
–20%
–30%
Nguyen CC
–40% Nguyen CB
Nor Hazurina
0 10 20 30 40 50 60 70
% Aggregate substitution

Oyster Scallop Crepidula Cockle

Figure 8.7 Variation of tensile strength at 7 days in concrete with marine shells as
aggregates.

Figure 8.8 Broken specimen of mussel shell concrete (Martı ´nez-Garcı ´a et al., 2017).

orientation in the concrete matrix. Secondly, porosity has a strong presence
throughout the concrete mass with apparently uniform distribution.
However, the outstanding effect is the reduction in the paste mussel shell aggre-
gate bond. This phenomenon is especially enhanced with coarse aggregates. It
should also be noted that this reduced bond of the aggregate with cement paste