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Meso-structural modelling in recycled aggregate concrete 469

Table 15.4 gives the elastic modulus values used for each matrix, which were practi-
cally constant throughout.

15.3.3.3 Results
Figs. 15.13 15.15 depict the stress distribution in the ITZs between the cement
matrix and the natural, unglazed ceramic and glazed ceramic aggregate,

Table 15.4 Elastic modulus for the cement matrices
Cementitious matrix Elastic modulus (GPa) Poisson’s ratio

Gravel 33.4 0.2
Ceramic aggregate 33.3 0.2
Ceramic glaze 34.1 0.2

Figure 15.13 Stress distribution in the natural aggregate/cement matrix ITZ (numerical
model). ITZ, Interfacial transition zone.

Figure 15.14 Stress distribution in the unglazed ceramic aggregate/cement matrix ITZ
(numerical model). ITZ, Interfacial transition zone.