Skripsi
ANALISIS MIKROSTRUKTUR MORTAR DENGAN PENAMBAHAN NANOSILIKA HASIL SINTESIS FLY ASH MENGGUNAKAN METODE PRESIPITASI
The development of cement-based materials has been widely pursued to enhance their mechanical performance and durability. Nanosilica is recognized as a promising supplementary material capable of improving mortar performance. This study aims to investigate the microstructural analysis of mortar incorporating fly ash–based nanosilica synthesized via the precipitation method at replacement levels of 0%, 3%, 6%, 9%, and 12%. Microstructural characterization was conducted using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The XRD results revealed that the control sample (N-0%) and NS-6% exhibited calcite, quartz, portlandite, and ettringite phases, with amorphous contents of 71.07% and 71.95%, respectively. NS-3% showed calcite and quartz phases, with an amorphous content of 75.31%. Meanwhile, NS-9% and NS-12% contained calcite, quartz, and portlandite phases, with amorphous contents of 72.29% and 84.84%, respectively. SEM observations indicated that the incorporation of nanosilica reduced pore size and distribution compared to the control sample. However, NS-6% exhibited a moderate pore distribution and the presence of microcracks associated with ettringite formation.
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