Title:
Curing of Concrete Specimens Containing Metakaolin, Zeolite, and Micro-/Nanobubble Water in Seawater
Author(s):
P. Mohsenzadeh Tochahi, G. Asadollahfardi, S. F. Saghravani, and N. Mohammadzadeh
Publication:
Materials Journal
Volume:
121
Issue:
3
Appears on pages(s):
81-90
Keywords:
curing; metakaolin; micro-/nanobubble; seawater; zeolite
DOI:
10.14359/51740567
Date:
5/1/2024
Abstract:
In marine structures, concrete requires adequate resistance against
chloride-ion penetration. As a result, numerous studies have been
conducted to enhance the mechanical properties and durability
of concrete by incorporating various pozzolans. This research
investigated the curing conditions of samples including zeolite
and metakaolin mixed with micro-/nanobubble water in artificial
seawater and standard conditions. The results indicated that incorporating zeolite and metakaolin mixed with micro-/nanobubble
water, cured in artificial seawater conditions, compared to similar
samples that were cured in standard conditions, improved the
mechanical properties and durability of concrete samples. The
28-day compressive strength of the concrete samples containing
10% metakaolin mixed with 100% micro-/nanobubble water and
10% zeolite blended with 100% micro-/nanobubble water cured in
seawater increased by 25.06% and 20.9%, respectively, compared
to the control sample cured in standard conditions. The most significant
results were obtained with a compound of 10% metakaolin
and 10% zeolite with 100% micro-/nanobubble water cured in
seawater (MK10Z10NB100CS), which significantly increased the
compressive, tensile, and flexural strengths by 11.13, 14, and 9.1%,
respectively, compared with the MK10Z10NB100 sample cured in
standard conditions. Furthermore, it considerably decreased the
24-hour water absorption and chloride penetration at 90 days—
by 27.70 and 82.89%, respectively—compared with the control
sample cured in standard conditions.