Pengaruh Penambahan Serat Limbah Plastik HDPE terhadap Kuat Tekan pada Mortar
Authors: Harsoyo Yoga Aprianto , Fauzi Muhammad Rifqi 
Published: October 2021

Mortar merupakan bahan konstruksi yang umum digunakan pada gedung maupun jalan. Beberapa konstruksi yang menggunakan mortar antara lain Lane Concrete (LC), spesi, perekat bata ringan, plester dinding, acian instan, pemasangan kramik, dan lain-lain. Serat limbah plastik HDPE (High Density Polyethylene) pada penelitian ini adalah bahan campuran sebagai pengikat dan pengganti semen. Plastik HDPE merupakan salah satu jenis plastik yang jika dilihat secara visual tergolong pekat, dimana pemakaian jenis plastik ini biasanya digunakan  untuk botol minuman. Jenis plastik HDPE mudah untuk di daur ulang. Penelitian ini diharapkan dapat mengurangi jumlah limbah plastik yang ada di Indonesia. Tujuan penelitian ini adalah untuk mengkaji pengaruh pencampuran serat limbah plastik HDPE dengan variasi terhadap kuat tekan dan berat mortar. Serat yang digunakan sebanyak 0%, 2%, 4%, dan 6% terhadap berat semennya. Penelitian ini dilakukan untuk memperoleh kuat tekan mortar pada umur 7 hari dan 28 hari dengan menggunakan benda uji kubus dengan dimensi 15 cm × 15 cm × 15 cm. Hasil pengujian menunjukkan bahwa kuat tekan tertinggi untuk mortar serat pada variasi serat 2% di umur 28 hari yaitu sebesar 14,47 MPa. Kuat tekan mortar pada umur 7 dan 28 hari berturut-turut mengalami kenaikan sekitar 11%. Sedangkan pada penambahan serat, kuat tekan mortar mengalami penurunan seiring dengan semakin banyaknya campuran serat. Mortar serat mengalami penurunan berat dari 7696 gram menjadi 7640 gram, 7422 gram, dan 7280 gram, masing-masing untuk 2%, 4%, dan 6% serat pada umur 28 hari. Mortar is a construction material commonly used in building and road infrastructure. Some constructions that use mortar include Lane Concrete (LC), species, light brick adhesives, wall plaster, mechanical installation, and others. HDPE plastic waste fiber (High density polyethylene) in this study is a mixture of materials as binders and cement substitutes. HDPE plastic is one type of plastic that when viewed visually is classified as concentrated, where the use of this type of plastic is usually used for beverage bottles. The HDPE plastic type is easy to recycle. In 2015, global plastic waste in the world was recorded at 2.5 billion tons per year, so this research is expected to reduce the amount of plastic waste in Indonesia. The purpose of this study was to analyze the  effect of mixing HDPE plastic waste fibers on compressive strength and mortar weight. This HDPE variations of 0%, 2%, 4%, and 6% is used from the weight of the cement. This study was carried out to obtain the compressive strength at the ages of 7 days and 28 days using cube specimens with dimensions of 15 cm × 15 cm × 15 cm. Based on the results of the test, the highest compressive strength for mortar at of 2% fiber variation at 28 days is 14.47 MPa. The compressive strength of mortar at the age of 7 and 28 consecutive days increased by 11%. While the addition of fibers, compressive strength of mortar decreases with the increasing number of fiber mixtures. Fiber mortar decreased in weight from 7696 grams to 7640 grams, 7422 grams, and 7280 grams, for fiber of 2%, 4%, and 6% respectively. Mortar is a construction material commonly used in building and road infrastructure. Some constructions that use mortar include Lane Concrete (LC), species, light brick adhesives, wall plaster, mechanical installation, and others. HDPE plastic waste fiber (High density polyethylene) in this study is a mixture of materials as binders and cement substitutes. HDPE plastic is one type of plastic that when viewed visually is classified as concentrated, where the use of this type of plastic is usually used for beverage bottles. The HDPE plastic type is easy to recycle. In 2015, global plastic waste in the world was recorded at 2.5 billion tons per year, so this research is expected to reduce the amount of plastic waste in Indonesia. The purpose of this study was to analyze the  effect of mixing HDPE plastic waste fibers on compressive strength and mortar weight. This HDPE variations of 0%, 2%, 4%, and 6% is used from the weight of the cement. This study was carried out to obtain the compressive strength at the ages of 7 days and 28 days using cube specimens with dimensions of 15 cm × 15 cm × 15 cm. Based on the results of the test, the highest compressive strength for mortar at of 2% fiber variation at 28 days is 14.47 MPa. The compressive strength of mortar at the age of 7 and 28 consecutive days increased by 11%. While the addition of fibers, compressive strength of mortar decreases with the increasing number of fiber mixtures. Fiber mortar decreased in weight from 7696 grams to 7640 grams, 7422 grams, and 7280 grams, for fiber of 2%, 4%, and 6% respectively.