Evaluasi Penggunaan Nano SiO2 Diekstrak dari Fly Ash dan Lumpur Sidoarjo terhadap Mekanisme Self-Healing Concrete secara Autogenous

Murdianto, Satria Ahmadsyah (2026) Evaluasi Penggunaan Nano SiO2 Diekstrak dari Fly Ash dan Lumpur Sidoarjo terhadap Mekanisme Self-Healing Concrete secara Autogenous. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penambahan nano SiO2 yang diekstrak dari Lumpur Sidoarjo (Lusi), dan Fly Ash (FA) berpengaruh terhadap mekanisme Self-Healing Concrete (SHC) secara autogenous. Proses ekstraksi dilakukan melalui metode leaching menggunakan asam sitrat dan basa NaOH, diikuti dengan pembakaran pada suhu 800°C untuk memperoleh struktur kristalin nano SiO2. Karakterisasi dilakukan menggunakan XRD, SEM, dan FTIR untuk menentukan ukuran partikel, morfologi, serta gugus fungsi nano SiO2 dan nanopartikel C-S-H. Hasil uji menunjukkan, bahwa nano SiO2 amorf dari Lusi dan FA memiliki ukuran partikel 0,6727 nm dan 0,6707 nm. Sedangkan, setelah dimodifikasi menjadi kristalin meningkat menjadi 31,742 nm dan 39,246 nm. Uji kuat tekan pada pasta semen menunjukkan bahwa penambahan nano SiO2 mampu meningkatkan kemampuan penyembuhan retak secara autogenus dengan tingkat penutupan mencapai 71–97% untuk FA dan 66–77% untuk Lusi. Mekanisme peningkatan ini dikaitkan dengan peran kristalinitas nano SiO2 sebagai tempat nukleasi bagi pembentukan senyawa C-S-H dan CaCO3 yang mempercepat proses penyembuhan. Serta, peningkatan kuat tekan dengan perbedaan cukup signifikan saat diberi tambahan material nano SiO2 berstruktur amorf maupun kristalin. Hasil kuat tekan paling tinggi dan hampir sama dimiliki oleh penambahan nano SiO2 amorf tanpa retakan, dengan penambahan nano SiO2 kristalin dengan perlakuan retakan awal dan wet-dry. Mekanisme ini dikaitkan kuat terhadap perbedaan struktur C-S-H (Calcium-Silicate-Hydrate) yang terbentuk.
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The addition of nano SiO2 extracted from Sidoarjo mud (Lusi) and fly ash (FA) was found to influence the autogenous self-healing mechanism of self-healing concrete (SHC). The extraction process was carried out using a leaching method with citric acid and NaOH, followed by calcination at 800 °C to obtain crystalline nano SiO2 structures. Characterization was performed using XRD, SEM, and FTIR to determine the particle size, morphology, and functional groups of nano SiO2 as well as C-S-H nanoparticles. The results showed that amorphous nano SiO2 derived from Lusi and FA exhibited grain sizes of 0.6727 nm and 0.6707 nm, respectively. After modification into the crystalline form, the particle sizes increased to 31.742 nm and 39.246 nm. Compressive strength tests on cement paste indicated that the incorporation of nano SiO2 enhanced the autogenous crack-healing capability, with crack closure levels reaching 71–97% for FA and 66–77% for Lusi. This improvement is attributed to the role of nano SiO2 crystallinity as nucleation sites for the formation of C-S-H and CaCO3 compounds, which accelerate the healing process. In addition, a notable increase in compressive strength was observed for cement paste incorporating both amorphous and crystalline nano-SiO₂. Comparable and highest compressive strength values were achieved by specimens containing amorphous nano SiO2 without pre-cracking and crystalline nano SiO2 subjected to initial cracking and wet-dry cycles. This behavior is strongly associated with differences in the morphology and structural characteristics of the formed calcium–silicate–hydrate (C-S-H).

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Self-healing Concrete, Autogenous, Nano SiO2, Fly Ash, Lumpur Sidoarjo ; Self-healing Concrete, Autogenous, Nano SiO2, Fly Ash, Sidoarjo Mud
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA681 Concrete construction
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Satria Ahmadsyah Murdianto
Date Deposited:	04 Feb 2026 09:10
Last Modified:	04 Feb 2026 09:10
URI:	http://repository.its.ac.id/id/eprint/132140

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