Electronic Theses and Dissertation

Abstrak. Peningkatan jumlah limbah plastik multilayer yang sulit didaur ulang menjadi salah satu permasalahan lingkungan yang memerlukan solusi pemanfaatan yang berkelanjutan. Salah satu alternatif yang dapat dilakukan adalah mengolah limbah plastik multilayer menjadi paving block. Namun, penggunaan pasir sebagai pengisi dapat menimbulkan dampak terhadap lingkungan. Penelitian ini bertujuan menganalisis karakteristik limbah plastik multilayer, pengaruh rasio pasir dan ampas tebu terhadap sifat fisik dan mekanik paving block menggunakan analisis regresi, serta mengevaluasi kelayakan ekonomi prosespaving block menggunakan analisis regresi, serta mengevaluasi kelayakan ekonomi produksinya. Penelitian dilakukan dalam dua tahap. Tahap pertama menggunakan variasi rasio plastik multilayer dan pasir sebesar 100:0, 80:20, 60:40, 50:50, dan 40:60. Rasio terbaik dari tahap pertama kemudian digunakan pada tahap kedua dengan substitusi sebagian pasir menggunakan ampas tebu sebesar 0,5%; 1%; 2%; 3%; 4%; dan 5%. Karakterisasi limbah plastic menggunakan FTIR dan TGA, sedangkan paving block di uji kuat tekan, penyerapan air, densitas, porositas, dan SEM. Data dianalisis menggunakan ANOVA, regresi polinomial kuadratik, serta analisis kelayakan ekonomi melalui HPP, BEP, B/C Ratio, dan Payback Period. Hasil penelitian menunjukkan Rasio pasir dan ampas tebu berpengaruh sangat signifikan terhadap kuat tekan. Nilai kuat tekan tertinggi sebesar 15,15MPa diperoleh pada rasio 50:50, sedangkan penambahan ampas tebu meningkatkan porositas dengan seluruh sampel penyerapan airmemenuhi persyaratan mutu A pada SNI 03-0691-1996. Berdasarkan analisis ekonomi, HPP paving block sebesar Rp. 4.667,81 dengan harga jual Rp 6.068,15 per unit. Nilai BEP sebanyak 34.615 unit, Payback Period selama 7,1 bulan dan B/C Ratio sebesar 1,3 sehingga usaha produksi paving block berbahan lmbah plastik multilayer layak dan berpotensi dikembangkan.

Abstract. The increasing volume of multilayer plastic waste, which is difficult to recycle, has become an environmental problem that requires a sustainable utilization solution. One possible alternative is to process multilayer plastic waste into paving blocks. However, the use of sand as a filler can have an impact on the environment. This study aims to analyze the characteristics of multilayer plastic waste, examine the effect of the ratio of sand to sugarcane bagasse on the physical and mechanical properties of paving blocks using regression analysis, and evaluate the economic feasibility of the paving block production process. The study was conducted in two stages. The first stage used variations in the ratio of multilayer plastic to sand of 100:0, 80:20, 60:40, 50:50, and 40:60. The optimal ratio from the first stage was then used in the second stage, with partial substitution of sand with sugarcane bagasse at levels of 0.5%, 1%, 2%, 3%, 4%, and 5%. Plastic waste was characterized using FTIR and TGA, while the paving blocks were tested for compressive strength, water absorption, density, porosity, and SEM. The data were analyzed using ANOVA, quadratic polynomial regression, and economic feasibility analysis through HPP, BEP, B/C Ratio, and Payback Period. The results showed that the ratio of sand to sugarcane bagasse had a highly significant effect on compressive strength. The highest compressive strength value of 15.15 MPa was obtained at a 50:50 ratio, while the addition of bagasse increased porosity, with all samples’ water absorption meeting quality requirement A in SNI 03-0691-1996. Based on the economic analysis, the production cost (HPP) of the paving blocks was Rp 4,667.81, with a selling price of Rp 6,068.15 per unit. The break-even point (BEP) was 34,615 units, the payback period was 7.1 months, and the B/C ratio was 1.3 therefore, the production of paving blocks made from multilayer plastic waste is feasible and has the potential for further development. Keywords: Multilayer plastic waste, sugarcane bagasse, paving blocks, economic feasibility.