Analisis Pengaruh Komposisi Pumice Stone dan rHDPE terhadap Sifat Mekanik dan Morfologi Mortar Ringan Komposit Polimer Epoksi

Aqilla, Fariz (2026) Analisis Pengaruh Komposisi Pumice Stone dan rHDPE terhadap Sifat Mekanik dan Morfologi Mortar Ringan Komposit Polimer Epoksi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pengurangan berat elemen nonstruktural penting untuk meminimalkan beban mati bangunan dan meningkatkan ketahanan terhadap gempa. Penelitian ini bertujuan menganalisis pengaruh komposisi agregat ringan batu apung (pumice stone) dan pengisi limbah plastik recycled high-density polyethylene (rHDPE) terhadap sifat fisik, mekanik, dan morfologi mortar komposit polimer bermatriks epoksi. Spesimen dibuat dengan metode open mold casting meliputi variasi sistem biner (E90P10–E50P50), substitusi pasir–batu apung (E60S30P10–E60S10P30), dan sistem kuaterner (E60S10P25R5–E60S10P20R10). Hasil pengujian menunjukkan peningkatan kadar batu apung menurunkan densitas hingga 0,952〖" g/cm" 〗^3Seluruh variabel bebas (E90P10–E60S10P20R10) memenuhi syarat kuat tekan ASTM C90/C129 (≥4,14 MPa) sekaligus Mutu I SNI 03-0349-1989 (≥7 MPa) untuk dinding pasangan, dengan densitas di bawah ambang beton ringan 1.680 kg/m³. Dengan mempertimbangkan keseluruhan sifat serta pemanfaatan limbah daur ulang, formulasi kuaterner E60S10P20R10 ditetapkan sebagai komposisi terbaik karena memadukan densitas ultra-rendah 1,009 g/cm³ (turun 30,1% dari kontrol pasir E60S40), kuat tekan 14,07 MPa, penyerapan air sangat rendah 0,214%, dan mode kegagalan tangguh yang aman terhadap keruntuhan getas. Pada sistem kuaterner, spesimen E60S10P20R10 memperlihatkan peningkatan kuat tekan (14,07" MPa" ) dan kekerasan (49,4" Shore D" ) jika dibandingkan dengan E60S10P25R5. Substitusi batu apung oleh rHDPE yang padat memulihkan volume defisiensi resin serta menghasilkan penyerapan air sangat rendah sebesar 0,214% akibat sifat hidrofobik polimer. Analisis SEM-EDX menunjukkan adanya mechanical interlocking pada pori batu apung serta celah debonding pada antarmuka epoksi–rHDPE. Analisis FTIR memvalidasi ketuntasan derajat curing epoksi melalui hilangnya gugus oksirana pada 915〖" cm" 〗^(-1) dan membuktikan interaksi epoksi–rHDPE murni bersifat fisik. Komposit ini potensial untuk aplikasi panel dinding pracetak insulatif kedap air.
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Reducing the dead load of non-structural elements is essential for minimizing building loads and enhancing earthquake resilience. This study aims to analyze the effects of volcanic pumice and recycled high-density polyethylene (rHDPE) waste filler compositions on the mechanical, physical, and morphological properties of epoxy-matrix composite mortars. Specimens were fabricated using the open mold casting method with binary (E90P10–E50P50), sand–pumice substitution (E60S30P10–E60S10P30), and quaternary (E60S10P25R5–E60S10P20R10) compositions. The results showed that increasing pumice content reduced the bulk density to as low as 0.952 g/cm³ but also decreased compressive strength due to the aggregate percolation threshold and resin starvation. Among the tested formulations, the binary E80P20 composition exhibited the best balance between low density and high compressive strength, achieving a density of 1.066 g/cm³ (26.1% lower than the sand control), a compressive strength of 20.36 MPa, a hardness of 59.0 Shore D, and a water absorption of 0.332%, thereby satisfying the Type M structural mortar standard (>17.2 MPa). In the quaternary system, the E60S10P20R10 composition demonstrated higher compressive strength (14.07 MPa) and hardness (49.4 Shore D) than E60S10P25R5. Replacing porous pumice with solid rHDPE restored the effective resin volume and reduced water absorption to 0.214% due to the hydrophobic nature of the polymer. SEM-EDX analysis confirmed mechanical interlocking within the pumice pores as well as debonding gaps at the weak epoxy–rHDPE interface, while FTIR spectroscopy verified complete matrix curing through the disappearance of the oxirane peak at 915 cm⁻¹ and indicated that the interactions were purely physical. These findings identify lightweight polymer mortar formulations with promising potential for waterproof precast partition panel applications.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Komposit polimer, Batu apung, rHDPE, Epoksi, Kuat tekan.Polymer composite, Pumice stone, rHDPE, Epoxy, Compressive strength.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) 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:	Fariz Nur Aqilla
Date Deposited:	30 Jul 2026 05:07
Last Modified:	30 Jul 2026 05:07
URI:	http://repository.its.ac.id/id/eprint/137831

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