الفهرس 
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Abstract
The present investigation aims to evaluate the impact of prepared magnesia nanoparticles
(MNP) and titania nanoparticles (TNP) on engineering properties of Alkali Activated Cements
(AAC) based on granulated blast-furnace slag (GFS). Fresh and hardened properties of AACGFS with or without nanoparticles were evaluated. The results showed that both MNP and TNP
have a positive impact on the physico-mechanical properties: compressive strength, flexural
strength, setting times, dry shrinkage, total porosity and flow rate. Complementary, the M3-
MNP (containing 3wt. % MNP) and M1-TNP (containing 1wt. % TNP) mixes revealed the
highest mechanical strengths, in addition to a significantly reduction in drying shrinkage, total
porosity and flow rate and lower setting times comparing to control samples. This fact can be
due to the synergistic formation of CSH gel in parallel with hydrotalcite CH24O23Mg6Al2
(Hct), CTiSH and C4TiH13 phases, which have a potential impact on the performance of
geopolymerization system. The impact of prepared magnesia and titania nanoparticles at various
dosages (0, 1, 3 and 5 wt.%) on mechanical and durability characteristics of AASMs was
conducted. Specimens were either fully immersed in sulfuric acid (1% concentration) or
subjected to elevated temperatures (250, 500 and 750℃). Optimum performance prior to and
after exposures was achieved for specimens containing 3% magnesia nanoparticles (MNP) and
1% Titania nanoparticles (TNP) in terms of compressive strength, water absorption, weight loss
and compressive strength retention. Different instrumental methods such as XRD, FTIR and
SEM morphology were conducted in order to determine the hydration products, durability
properties and confirm the experimental results.