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"Expanded Polystyrene (EPS) merupakan material berbahan dasar plastik yang memiliki dampak buruk terhadap lingkungan karena sifatnya yang sulit terurai. Sifat EPS yang sangat ringan tentu dapat mereduksi kekuatan tekan dan berat isi dari beton, oleh karena itu dilakukan pre-treatment berupa pemanasan dengan oven pada suhu 130oC untuk menghasilkan sifat baru dengan sebutan Modifed Expanded Polystyrene dengan kekuatan yang lebih baik. Campuran beton khususnya agregat kasar akan disubtitusi menggunakan MEPS sebanyak 10%, 20%, dan 25% dari total volume agregat kasar pada beton. Sampel yang akan digunakan antara lain adalah beton silinder dengan ukuran 10x20 cm dan beton kubus dengan ukuran 15x15x15 cm. Hasil penelitian menunjukkan beton dengan MEPS sebagai subtitusi agregat kasar dapat mereduksi berat isi dan kekuatan tekan tetapi mengalami kenaikan pada kada subtitusi MEPS 20%. Hasil lainnya yang dilakukan melalui pengujian Digital Image Correlation (DIC) Analysis dan Ultrasonic Pulse Velocity (UPV) menunjukkan nilai stiffness dan cepat rambat gelombang meningkat pada kadar subtitusi MEPS 20%. Sedangkan, nilai poisson ratio menurun seiring bertambahnya kadar MEPS. Nilai modulus elastisitas belum setara dengan perhitungan teoritis akan tetapi pada kadar MEPS 20% memiliki nilai yang paling mendekati. Penggunaan MEPS sebagai subtitusi agregat kasar memiliki potensi dan bisa digunakan sebagai alternatif beton pengganti agregat kasar alami pada kadar 20%.

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Expanded Polystyrene (EPS) is a plastic-based material that has a bad impact on the environment because it is difficult to decompose. The very light nature of EPS can certainly reduce the compressive strength and bulk density of concrete, therefore pre-treatment is carried out in the form of heating in an oven at 130oC to produce new properties called Modified Expanded Polystyrene with better strength. The concrete mixture, especially coarse aggregate, will be substituted using MEPS as much as 10%, 20% and 25% of the total volume of coarse aggregate in the concrete. The samples to be used include cylindrical concrete with a size of 10x20 cm and concrete cubes with a size of 15x15x15 cm. The results showed that concrete with MEPS as a coarse aggregate substitute could reduce the unit weight and compressive strength but increased at 20% MEPS substitution. Other results carried out through Digital Image Correlation (DIC) Analysis and Ultrasonic Pulse Velocity (UPV) tests showed that the value of stiffness and wave propagation speed increased at a 20% MEPS substitution level. Meanwhile, the value of the Poisson ratio decreased with increasing levels of MEPS. The value of the elastic modulus is not equivalent to theoretical calculations but at 20% MEPS content it has the closest value. The use of MEPS as a substitute for coarse aggregate has potential and can be used as an alternative to natural coarse aggregate at a content of 20%."

"Penggunaan Expanded Polystyrene (EPS) daur ulang sebagai agregat dalam pembuatan beton ringan akan membuka potensi penanganan sampah EPS. Campuran beton dan mortar kemudian dilakukan substitusi menggunakan EPS sebesar 15%, 20%, dan 25% dari volume beton pada agregat. Sampel uji yang digunakan berupa beton silinder 15x30cm dan kubus 15x15x15cm serta mortar berupa kubus 5x5x5cm. Hasil penelitian yang didapat menunjukkan penambahan kadar EPS daur ulang mereduksi kuat tekan yang diiringi dengan penurunan berat isi beton dan mortar. Melalui pengujian menggunakan instrument strain gauge, didapatkan modulus elastisitas beton menurun dengan penambahan kadar persentase EPS daur ulang. Digital Image Correlation Analysis (DIC) menunjukkan bahwa nilai stiffness dan poisson ratio beton menurun dengan penambahan kadar persentase EPS daur ulang. Selain itu, nilai stiffness dan poisson ratio yang didapat menggunakan DIC analysis dipengaruhi oleh faktor bentuk dan dimensi dari benda uji.

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The use of recycled Expanded Polystyrene (EPS) as an aggregate in lightweight concrete will open up the potential for handling EPS waste. The mixture of concrete and mortar was then substituted using EPS of 15%, 20%, and 25% of the concrete volume in the aggregate; the test samples were used in the form of cylindrical concrete 15x30cm and cubes 15x15x15cm and mortar in the form of cubes 5x5x5cm. The results showed that the addition of recycled EPS content reduced the compressive strength, accompanied by a decrease in the density of concrete and mortar. Through testing using a strain gauge instrument, it was found that the modulus of elasticity of concrete decreased with the addition of recycled EPS percentage levels. Digital Image Correlation Analysis (DIC) showed that the stiffness and poisson ratio of concrete decreased with the addition of recycled EPS percentage. In addition, the stiffness and poisson ratio values obtained using DIC analysis are influenced by the shape and dimensions of the test object."