@Article{fdmp.2023.027877,
AUTHOR = {Jing Yu, Jie Ren, Guangming Shen, Weixiang Sun, Hui Wang},
TITLE = {Influence of Erosion Induced by NaCl on the Mechanical Performances of Alkali-Activated Mineral Admixtures},
JOURNAL = {Fluid Dynamics \& Materials Processing},
VOLUME = {19},
YEAR = {2023},
NUMBER = {9},
PAGES = {2385--2398},
URL = {http://www.techscience.com/fdmp/v19n9/52765},
ISSN = {1555-2578},
ABSTRACT = {In this paper, the influence of NaCl freeze-thaw (F-T) cycles and dry-wet (D-W) alternations on the flexural, compressive and bonding strengths of alkali-activated fly ash (FA) and a blast furnace slag powder (BFS) is investigated. The considered NaCl concentration is 3%. The effect of polypropylene fibers on the mechanical strengths is
also examined. Scanning electron microscopy (SEM), thermogravimetry (TG) and X-ray diffraction (XRD) are
selected to discern the mechanisms underpinning the NaCl-induced erosion. The obtained results indicate that
the best results in terms of material resistance are obtained with admixtures containing 60% BFS and 40% FA
in terms of mass ratio and 3% polypropylene fibers in terms of volume ratio. The maximum rates of decrease
of the flexural, compressive and bonding strengths after 300 NaCl F-T cycles are 21.5%, 20.3% and 22.6%, respectively. The corresponding rates of decrease due to NaCl D-W alternations are 28.1%, 26.1% and 31.5%, respectively. The TG curves show that the alkali-activating activity of BFS is higher than that of FA. Moreover, in the
first case, the microstructure of the hydration products is more compact. The results also show that NaCl F-T
cycles lead to increasing cracks in the alkali-activated BFS.},
DOI = {10.32604/fdmp.2023.027877}
}