<![CDATA[Abstract Concrete is one of the most widely used construction materials due to its strength and durability. The quality of concrete largely depends on the physical and mechanical properties of its aggregates. This study aims to evaluate the effect of coarse and fine aggregates from the Cilegon Quarry on the compressive strength of K-250 concrete. Aggregate tests were conducted according to Indonesian National Standards (SNI), including sieve analysis, moisture content, bulk density, specific gravity, water absorption, mud content, abrasion, and organic content. Concrete cylinder specimens were prepared and tested at 28 days. The results show that parameters such as gradation, compacted bulk density, water absorption, abrasion resistance, and organic content met SNI requirements, while moisture content, specific gravity, and mud content did not. The average compressive strength obtained was 175 kN (11.36 MPa), lower than the target strength for K-250 concrete. It can be concluded that aggregates from the Cilegon Quarry are not yet suitable for K-250 concrete without proper pre-treatment and mix proportion adjustments. Abstrak Beton merupakan salah satu material konstruksi yang paling banyak digunakan karena memiliki kekuatan dan durabilitas yang tinggi. Kualitas beton sangat dipengaruhi oleh sifat fisik dan mekanik agregat penyusunnya. Penelitian ini bertujuan untuk mengevaluasi pengaruh agregat kasar dan halus yang berasal dari Quarry Cilegon terhadap kuat tekan beton mutu K-250. Pengujian agregat dilakukan sesuai dengan Standar Nasional Indonesia (SNI), meliputi analisis saringan, kadar air, berat isi, berat jenis, penyerapan air, kandungan lumpur, keausan, dan kadar zat organik. Benda uji berbentuk silinder kemudian diuji kuat tekannya pada umur 28 hari. Hasil penelitian menunjukkan bahwa parameter seperti gradasi, berat isi padat, penyerapan air, keausan, dan kadar zat organik memenuhi standar SNI, sedangkan kadar air, berat jenis, dan kandungan lumpur belum memenuhi. Nilai kuat tekan rata-rata sebesar 175 kN atau 11,36 MPa, lebih rendah dari kuat tekan rencana beton mutu K-250. Dengan demikian, agregat dari Quarry Cilegon belum sepenuhnya layak digunakan untuk beton K-250 tanpa perlakuan awal dan penyesuaian proporsi campuran.]]>
