Microstructural evolution and mechanical behaviour of alkali activated fly ash binder treated clay
نویسندگان
چکیده
This work focuses on the use of alkali activated fly ash-based binder to enhance engineering characteristics soft clay-rich soils and as a substitute standard stabilisers (e.g., lime or cement). Especially, it examines microstructural evolution calcium-rich ash from coal combustion-based by sodium-based alkaline solution. To this end, processes generating microstructure pore network over time are investigated. A second point addressed study is how presence kaolin particles affects features binder. The has therefore been investigated considering alone mixed with kaolin. effects have observed at macroscopic level means one-dimensional compression tests. combination completing techniques used including Optical microscopy, Scanning Electron Microscopy Mercury Intrusion Porosimetry in order gain an overview complex structure. Microstructural changes occur around calcium-containing phases derived which reactive system. Namely, dissolution grains leads formation new compounds that first cover grain surfaces then further grow into available space. Furthermore, characterized progressive filling capillary pores while small nanometric being formed associated newly silicate-calcium chains. Similar tendencies when soil although general porosity lesser due small-sized kaolinite platelets. Experimental evidences microscale linked behaviour treated soil.
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ژورنال
عنوان ژورنال: Construction and Building Materials
سال: 2021
ISSN: ['1879-0526', '0950-0618']
DOI: https://doi.org/10.1016/j.conbuildmat.2021.122917