<![CDATA[AbstractConcrete is one of the most commonly used building materials in infrastructure, including buildings in marine environments. This research aims to provide an overview of the strength of concrete due to exposure to sea water and compare it with protected concrete. The research was carried out experimentally using the SNI 03 - 2834 - 2000 mix design method by testing the compressive strength and permeability of concrete with a total of 30 test objects. The concrete is given a protected treatment and submerged in sea water. The results of research on the compressive strength of protected concrete aged 28, 56 and 90 days were 22, 56 MPa, 24.35 MPa and 25.84 MPa respectively. Meanwhile, the compressive strength of concrete submerged in sea water aged 28, 56 and 90 days is 22.27 MPa, 17.67 MPa and 16.10 MPa. Meanwhile, testing the permeability of concrete using the natural method (immersing the concrete in sea water) showed that the permeability of concrete aged 28, 56 and 90 days was 27.7 mm, 35.0 mm and 40.7 mm. The greater the permeability of the concrete, the smaller the compressive strength of the concrete and the smaller the permeability of the concrete, the greater the compressive strength value. Sea water can reduce the compressive strength of concrete based on the soaking time. In this case it is recommended when building construction in a marine environment to make the concrete watertight. Key words : compressive strength, concrete, concrete permeability, sea water. AbstrakBeton adalah salah satu bahan bangunan yang paling umum digunakan dalam infrastruktur termasuk bangunan yang ada dalam lingkungan laut. Penelitian ini bertujuan untuk mengetahui gambaran mengenai kekuatan beton akibat terpapar oleh air laut dan membandingkan dengan beton terlindung. Penelitian dilakukan secara eksperimental dengan metode mix design SNI 03 – 2834 – 2000 dengan pengujian kuat tekan dan permeabilitas beton dengan jumlah benda uji sebanyak 30 sampel. Beton diberikan perlakuan terlindung dan terendam air laut. Diperoleh hasil penelitian kuat tekan beton terlindung umur 28, 56 dan 90 hari berturut – turut sebesar 22, 56 MPa, 24,35 MPa dan 25,84 MPa. Sedangkankuat tekan beton terendam air laut umur 28, 56 dan 90 hari sebesar 22,27 MPa, 17,67 MPa dan 16,10 MPa. Sedangkan pengujian permeabilitas beton menggunakan metode alami (merendam beton di air laut) diperoleh permeabilitas beton umur 28,56 dan 90 hari sebesar 27,7 mm, 35,0 mm dan 40,7 mm. Semakin besar permeabilitas beton maka akan semakin kecil kuat tekan beton dan semakin kecil permeabilitas beton maka nilai kuat tekan akan semakin besar. Air laut dapat menurunkan kuat tekan beton berdasarkan lama perendaman. Dalam hal ini disarankan dalam pembangunan kontruksi dilingkungan laut untuk membuat beton kedap air.Kata kunci : air laut, beton, kuat tekan, permeabilitas beton.]]>
