Pengaruh Komposisi Expanded Polystyrene Dan Agregat Vulkanik Terhadap Karakteristik Fisis Dan Morfologi Mortar Ringan Hibrida Sebagai Dinding Pengisi

Samawa, Girdane Daelintang (2026) Pengaruh Komposisi Expanded Polystyrene Dan Agregat Vulkanik Terhadap Karakteristik Fisis Dan Morfologi Mortar Ringan Hibrida Sebagai Dinding Pengisi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pemanfaatan Expanded Polystyrene (EPS) sebagai agregat ringan pada mortar kerap memicu segregasi akibat gaya apung (buoyancy) dan lemahnya ikatan Interfacial Transition Zone (ITZ). Penelitian ini menyintesis mortar ringan hibrida dengan mengintegrasikan EPS dan batuan vulkanik (lava rock) guna menciptakan kuncian mekanis (mechanical interlocking) untuk mengompensasi kelemahan tersebut. Stabilitas suspensi adonan dikendalikan melalui pembatasan Faktor Air Semen (FAS) 0,25 dan penambahan superplasticizer PCE 0,25%. Variasi campuran dieksekusi berdasarkan persentase substitusi lava rock terhadap pasir. Hasil penelitian menunjukkan bahwa rekayasa reologi sukses memicu struktur tiksotropik yang mematikan gaya apung EPS sehingga segregasi absolut berhasil dicegah. Integrasi material hibrida menurunkan massa jenis mortar secara proporsional di bawah ambang batas maksimal 1680 kg/m³ (ASTM C90 dan C129), dengan seluruh varian melampaui syarat kuat tekan minimum dinding nonstruktural (4,14 MPa). Proporsi optimal secara definitif dicapai oleh varian E-P75-LR25 yang menyeimbangkan target reduksi densitas sebesar 1526,96 kg/m³ dengan retensi kuat tekan tinggi 33,72 MPa, kekerasan permukaan 82,80 HD, dan penyerapan air 2,83%. Analisis Scanning Electron Microscope (SEM) memvalidasi bahwa kelemahan mikro berupa loose bonding area pada antarmuka polimer EPS berhasil dikompensasi secara mekanis oleh lava rock. Gel C-S-H terbukti berpenetrasi dan memadat ke dalam rongga vesikular batuan vulkanik, menciptakan mechanical interlocking persisten yang secara efektif menjaga integritas kapasitas dukung beban matriks mortar hibrida.
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The utilization of Expanded Polystyrene (EPS) as a lightweight aggregate in mortar frequently induces segregation due to buoyancy forces and weak Interfacial Transition Zone (ITZ) bonding. This study synthesizes a hybrid lightweight mortar by integrating EPS and lava rock to generate mechanical interlocking that compensates for these deficiencies. Suspension stability of the fresh mixture was controlled through a restricted Water-to-Cement Ratio (W/C) of 0.25 combined with 0.25% PCE superplasticizer. Mix variations were executed based on the percentage substitution of lava rock for sand. The results indicate that rheological engineering successfully induced a thixotropic structure that neutralized the buoyancy force of EPS, thereby preventing absolute segregation. The integration of hybrid materials proportionally reduced the mortar's density below the maximum threshold of 1680 kg/m³ (ASTM C90 and C129), with all variants exceeding the minimum compressive strength requirement for nonstructural walls (4.14 MPa). The optimal proportion was definitively achieved by the E-P75-LR25 variant, which balanced a density reduction target of 1526.96 kg/m³ with a high compressive strength retention of 33.72 MPa, a surface hardness of 82.80 HD, and a water absorption of 2.83%. Scanning Electron Microscope (SEM) analysis validated that the microscale weakness of loose bonding areas at the EPS-polymer interface was mechanically compensated by the lava rock. C-S-H gel was shown to penetrate and consolidate into the vesicular cavities of the volcanic rock, creating persistent mechanical interlocking that effectively preserved the load-bearing capacity integrity of the hybrid mortar matrix.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Expanded Polystyrene (EPS), Kuat Tekan, Lava rock, Mechanical interlocking, Mortar Ringan. Compressive Strength, Expanded Polystyrene (EPS), Lava rock, Lightweight Mortar, Mechanical interlocking.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA439 Lightweight concrete. High strength concrete.
Divisions:	Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Girdane Daelintang Samawa
Date Deposited:	27 Jul 2026 02:49
Last Modified:	27 Jul 2026 02:49
URI:	http://repository.its.ac.id/id/eprint/137756

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