Zharfandy, Naufal Rafi (2026) Pengaruh Konsentrasi Polystyrene Microsphere Dan Durasi Penyemprotan Coating Berbasis Silika Termodifikasi Hexamethyldisilazane Terhadap Sifat Hidrofobik Pada Beton Lightweight Aggregate Concrete. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penggunaan Lightweight Aggregate Concrete (LWAC) dengan agregat expanded perlite memiliki kelemahan berupa tingginya porositas berjenjang yang rentan terhadap penyerapan air kapiler. Penelitian ini memodifikasi permukaan beton LWAC menjadi hidrofobik menggunakan pelapis sol-gel berbasis silika dari prekursor Tetraethyl orthosilicate (TEOS) dan Hexamethyldisilazane (HMDS) sebagai penurun energi permukaan, serta penambahan Polystyrene Microsphere (PSMS) sebagai pengisi pori. Aplikasi pada spesimen 5×5×5 cm menggunakan electric spray gun dilakukan dalam dua tahap: optimasi durasi penyemprotan larutan dasar (4, 6, 8, dan 10 detik) dan variasi konsentrasi PSMS (0,5 wt%, 1 wt%, 1,5 wt%, dan 2 wt%) pada durasi terbaik. Pengeringan dilakukan melalui proses curing pada suhu 60°C selama 1 jam dan drying pada 110°C selama 2 jam. Karakterisasi material melalui uji FTIR, PSA, XRD, SEM-EDX Mapping, dan Cross Section-EDX Mapping mengonfirmasi keberhasilan substitusi gugus silanol menjadi gugus metil serta dispersi partikel polimer yang merata di dalam matriks. Hasil pengujian fungsional menunjukkan durasi penyemprotan 10 detik memberikan performa optimal. Selanjutnya, pelapis silika termodifikasi HMDS dengan campuran PSMS pada konsentrasi 2 wt% mampu meningkatkan hidrofobisitas permukaan beton LWAC hingga menyentuh nilai Uji WCA tertinggi 130,09° dan laju Uji Water Absorption terendah 0,4681 kg/m². Pada Uji Sandpaper Abrasion, pelapis silika termodifikasi HMDS dengan campuran PSMS terbukti tangguh mempertahankan sifat hidrofobiknya dengan WCA stabil di angka 115,44°. Secara keseluruhan, pelapis silika termodifikasi HMDS dengan campuran PSMS efektif memblokir jalur air kapiler serta melindungi keawetan struktural beton LWAC.
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The application of Lightweight Aggregate Concrete (LWAC) with expanded perlite is hindered by its highly hierarchical porosity, making it susceptible to capillary water absorption. This study modified the LWAC surface to be hydrophobic using a silica-based sol-gel coating prepared from Tetraethyl orthosilicate (TEOS) and Hexamethyldisilazane (HMDS) to lower surface energy, alongside Polystyrene Microsphere (PSMS) as a pore-filler. The coating was applied onto 5×5×5 cm specimens using an electric spray gun in two phases: optimizing the base solution spraying duration (4, 6, 8, and 10 seconds) and testing PSMS concentrations (0.5 wt%, 1 wt%, 1.5 wt%, and 2 wt%) at the optimal duration. Specimens were cured at 60°C for 1 hour and dried at 110°C for 2 hours. Material characterizations via FTIR, PSA, XRD, SEM-EDX Mapping, and Cross Section-EDX Mapping confirmed the successful substitution of silanol with methyl groups and a uniform dispersion of polymer particles within the matrix. Functional test results revealed that the 10-second spraying duration yielded optimal performance. Furthermore, the HMDS-modified silica coating mixed with PSMS at 2 wt% concentration enhanced the LWAC surface hydrophobicity, reaching the highest WCA test result of 130.09° and the lowest Water Absorption test rate of 0.4681 kg/m². In the Sandpaper Abrasion test, the HMDS-modified silica coating mixed with PSMS proved resilient in retaining its hydrophobic properties, stabilizing at a WCA of 115.44°. Overall, the HMDS-modified silica coating mixed with PSMS proved effective in blocking capillary water pathways and preserving the structural durability of the LWAC.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Beton LWAC, Coating, Hexamethyldisilazane, Polystyrene Microsphere, Hidrofobik, LWAC Concrete, Coating, Hexamethyldisilazane, Polystyrene Microsphere, Hydrophobic |
| Subjects: | Q Science Q Science > QC Physics > QC162 Adsorption and absorption Q Science > QC Physics > QC173.4.C63 Composite materials Q Science > QD Chemistry > QD117 Absorption Q Science > QD Chemistry > QD471 Chemical compounds - Structure and formulas Q Science > QD Chemistry > QD481 Chemical structure. Q Science > QD Chemistry > QD75.2 Chemistry, Analytic |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Naufal Rafi Zharfandy |
| Date Deposited: | 24 Jul 2026 02:24 |
| Last Modified: | 24 Jul 2026 02:24 |
| URI: | http://repository.its.ac.id/id/eprint/136691 |
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