KARAKTERISTIK MEKANIK dan DURABILITAS MORTAR POLIMER NANOKOMPOSIT

SEPTRIANSYAH, VERINAZUL and Saloma, Saloma and Nurjannah, Siti Aisyah (2025) KARAKTERISTIK MEKANIK dan DURABILITAS MORTAR POLIMER NANOKOMPOSIT. Doctoral thesis, Sriwijaya University.

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Abstract

This research aims to investigate the effect of nano-silica (SiO₂) incorporation and thermal treatment in polymer mortars on physical, mechanical, and durability characteristics under aggressive environmental conditions. The study focused on optimizing the nanocomposite composition, analyzing the effect of microstructure modification, and evaluating the long-term durability of the material in critical environments including seawater, swamp water, and sulfuric acid solution. The experimental method involved synthesizing epoxy resin-based polymer mortars with a systematic approach. Nanocomposites were prepared through the incorporation of nano silica at varying levels of 0%, 0.3%, 0.4%, and 0.5% by weight with epoxy resin matrix at a 1:1 ratio. To analyze the effect of thermal treatment, the specimens were subjected to 85°C heating for 1 hour. Durability testing was carried out through immersion for 90 days using cyclical and static methods. Material characterization was performed using multi-disciplinary analytical techniques including specific gravity (density) measurement, ASTM C109 standard compressive strength test, micrograph analysis by Scanning Electron Microscope (SEM), crystal phase identification using X-ray diffraction (XRD), and Fourier Transform Infrared (FTIR) spectroscopy analysis for chemical bond identification. The results showed that the addition of 0.4 wt% nano silica resulted in a significant increase in compressive strength up to 45.23 MPa (23.4% increase over the control) with an optimum density of 1573.33 kg/m³. FTIR analysis identified an intensification of Si-O-Si bonds at wave numbers of 1050-1080 cm-¹, confirming the integration of nano silica into the polymer matrix and an increase in the degree of cross-linking. SEM micrographs showed a volumetric reduction in porosity of up to 68% with a homogeneous distribution of nano-silica particles (dispersion coefficient 0.87) in the epoxy matrix. XRD analysis confirmed that the nano-silica was incorporated in amorphous form with a particle size of 54-100 nm, with SiO₂ purity reaching 99%. Thermal treatment at 85°C for 1 hour of specimens with 0.4% nano-silica increased in compressive strength to exceed 50 MPa with superior structural stability after immersion in an aggressive environment. Durability evaluation showed that the specimens with nano silica modification and thermal treatment maintained structural integrity and mechanical properties with minimal degradation after 90 days of exposure to seawater, swamp water, and sulfuric acid. Comprehensive correlation between FTIR, XRD, and SEM analysis revealed a fundamental mechanism of mechanical property enhancement involving: (1) the filling of microstructural voids by nano-silica particles, (2) the enhancement of interfacial bonding between the polymer matrix and aggregate, (3) the structural modification of the silica phase, and (4) the enhancement of crystallinity with a decrease in lattice strain in silica. This study concludes that modification of polymer mortar with 0.4% nano-silica combined with thermal treatment at 85°C produces construction materials with superior performance for applications in aggressive environments. This study makes a significant contribution to the development of high-durability polymer-based construction materials and has important implications for infrastructure applications in coastal areas, swamps, and acid-exposed environments.

Item Type:	Thesis (Doctoral)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials > TA418.9.C6.B538 Composite materials. Polymeric composites. Fibrous composites. Biomass chemicals. TECHNOLOGY & ENGINEERING / Material Science. SCIENCE / Chemistry / General
Divisions:	03-Faculty of Engineering > 21001-Engineering Science (S3)
Depositing User:	Verinazul Septriansyah
Date Deposited:	08 May 2025 07:06
Last Modified:	08 May 2025 07:06
URI:	http://repository.unsri.ac.id/id/eprint/171821

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