Thesis (PhD) - Cyprus International University. Institute of Graduate Studies and Research Civil Engineering

This thesis investigates the optimization of alkali-activated mortar by integrating nano
silica, various fibers, and refining mix formulations. The study evaluates the impact of
these components on the mechanical performance, durability, and chemical resistance
of alkali activated mortar (AAM) through empirical methodology. Initial literature
review identifies optimal proportions of fibers and nano materials for incorporation
into concrete and mortar mixtures. Experimental work explores into the effects of mix
parameters on mortar's performance, highlighting enhancements in mechanical
strength and chemical resistance with the inclusion of fibers and nano silica.
Optimizing mix proportions, especially the sodium silicate to sodium hydroxide ratio
(SS/SH) and sodium hydroxide molarity, is crucial for enhancing AAM properties.
The research also investigates the impact of various superplasticizers and the
significance of precursor combination and content in achieving superior material
qualities. Advanced statistical and machine learning analyses are utilized to uncover
detailed relationships between mix components and AAM performance, informing the
creation of optimized formulations. These analyses highlight the intricate interactions
within AAM mixes and demonstrate that precise adjustments can lead to substantial
improvements in material properties. Moreover, the thesis explores the impact of
different curing conditions and chemical exposures on AAM, shedding light on its
durability and resistance to environmental stress. By utilizing the CONCRETop
optimization method, the research determines ideal mix designs for specific
applications, striking a balance between mechanical properties, durability, costeffectiveness,
and environmental impact. This approach not only demonstrates the
adaptability of AAM in addressing various construction requirements but also presents
opportunities for sustainable development in the construction industry. In conclusion,
the thesis provides a comprehensive perspective on AAM development, highlighting
the important influence of nano silica, fibers (basalt fiber, polypropylene fiber, carbon
fiber, steel fiber, polyvinyl alcohol PVA fiber and polyester fiber), and optimized mix
formulations in improving the material's performance. The discoveries make a
substantial contribution to the construction materials field by suggesting a way to
create more resilient, environmentally friendly, and high-performance building
solutions. This study lays the groundwork for further progress in AAM technology
with the goal of expanding its application potential and encouraging sustainable
construction practices globally.