Analisis Unjuk Kerja Self-Healing Pasta Semen Autogenus Dengan Berbagai Polimorfi SiO2 (Cristobalite, Tridymite, Dan Quartz)

Bimatara, Zidan Dani (2026) Analisis Unjuk Kerja Self-Healing Pasta Semen Autogenus Dengan Berbagai Polimorfi SiO2 (Cristobalite, Tridymite, Dan Quartz). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Beton memiliki kelemahan umum berupa terbentuknya retak mikro akibat beban mekanik, penyusutan, serta paparan lingkungan. Retak mikro yang tidak tertangani dapat menurunkan durabilitas struktur dan mempercepat kerusakan material. Penelitian ini menganalisis unjuk kerja self-healing pasta semen autogenus dengan penambahan nanopartikel SiO₂ berbagai polimorfi, yaitu amorf, quartz, tridymite, dan cristobalite. Nano-SiO₂ disintesis menggunakan metode Stöber dari prekursor TEOS, kemudian dimodifikasi melalui perlakuan termal untuk memperoleh variasi struktur kristal. Karakterisasi material dilakukan menggunakan X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX), uji daya serap air, uji porositas, kalorimetri, pengamatan self-healing, serta uji kuat tekan. Hasil karakterisasi menunjukkan bahwa nano-SiO₂ berhasil disintesis dengan variasi fasa amorf, quartz, tridymite, dan cristobalite. Kapasitas serapan air menurun seiring meningkatnya kristalinitas, yaitu amorf sebesar 82%, quartz 34%, tridymite 1,5%, dan cristobalite 0,3%. Penambahan SiO₂ mampu meningkatkan kemampuan pemulihan retak dibandingkan sampel referensi. Sampel quartz menunjukkan pemulihan kuat tekan hingga mendekati kondisi sebelum retak, sedangkan tridymite menghasilkan pemulihan tegangan yang melampaui kondisi awal. Hal ini menunjukkan bahwa polimorfi SiO₂ berperan penting sebagai pusat nukleasi dan pendukung pembentukan produk healing seperti C-S-H dan CaCO₃. Penelitian ini berhubungan dengan SDGs ke-9 (Industry, Innovation and Infrastructure) melalui pengembangan material infrastruktur yang lebih tangguh, serta SDGs ke-11 (Sustainable Cities and Communities) karena mendukung peningkatan durabilitas dan keberlanjutan struktur bangunan.
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Concrete commonly experience microcrack formation due to mechanical loading, shrinkage, and environmental exposure. Untreated microcracks may reduce structural durability and accelerate material degradation. This study analyzes the performance of autogenous self-healing cement paste with the addition of SiO₂ nanoparticles in different polymorphic forms, namely amorphous silica, quartz, tridymite, and cristobalite. The SiO₂ nanoparticles were synthesized using the Stöber method from tetraethyl orthosilicate (TEOS) as the precursor, followed by thermal treatment to obtain different crystalline phases. Material characterization was carried out using X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDX), water absorption testing, porosity analysis, calorimetry, self-healing observation, and compressive strength testing. The characterization results indicate that SiO₂ nanoparticles with different polymorphic structures were successfully obtained. Water absorption capacity decreased with increasing crystallinity, with amorphous silica showing the highest absorption, followed by quartz, tridymite, and cristobalite. The addition of SiO₂ improved the crack recovery ability compared with the reference sample. Quartz showed compressive strength recovery close to the pre-cracking condition, while tridymite exhibited stress recovery exceeding the initial condition. These results indicate that SiO₂ polymorphism plays an important role as a nucleation site and supports the formation of healing products such as C-S-H and CaCO₃. This research is related to SDG 9: Industry, Innovation and Infrastructure, through the development of more durable infrastructure materials, and SDG 11: Sustainable Cities and Communities, by supporting long-term structural sustainability.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	autogenous self-healing, nano-SiO₂, pasta semen, polimorfi SiO₂, autogenous self-healing, cement paste, nano-SiO₂, SiO₂ polymorphism.
Subjects:	Q Science > QD Chemistry > QD905.2 Crystals. T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Zidan Dani Bimatara
Date Deposited:	03 Aug 2026 09:32
Last Modified:	03 Aug 2026 09:32
URI:	http://repository.its.ac.id/id/eprint/142185

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