FZALFresnel Zone Acoustic Lens
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It is a result of high portlandite occurrence and thus slower carbonation in FZAL and CZAL mortars which is confirmed in their TGA-DTA analysis (Fig.
Substantial increase of [R.sub.c] was reached at 90 days for FZAL and CZAL mortars of about 54 and 72 % when compared to AL, respectively.
The decrease in flexural strength of CZAL in comparison with FZAL is partially due to zeolite-paste interface fragility, especially evident in the bigger particles, following a rupture scheme similar to that of common aggregate/binder interface.
The upward trend in E values with age is evident in AL, FZAL and CZAL mortars (Fig.