Electronic Theses and Dissertation

ABSTRAK
Intrusi air asin yaitu proses masuknya air asin ke lapisan air tanah yang dapat meningkatkan kadar garam pada air tanah. Kadar garam terlarut dalam air atau dikenal dengan salinitas menjadi salah satu penyebab korosi pada tulangan beton bertulang penelitian ini untuk mengetahui pemetaan intrusi air asin dan pengaruhnya terhadap laju korosi dan sisa umur bangunan kantor pemerintah di zona timur Krueng Lamnyong. Kantor pemerintah yang menggunakan beton bertulang pada struktur utama bangunannya menjadi rentan terhadap dampak korosi ini. Pengukuran laju korosi menggunakan benda uji BjTP 280 diameter 10 mm (P10) dan diameter 12 mm (P12) ini dipotong ±5 cm dan ditimbang beratnya, kemudian ditanam selama 30 hari kedalam 1 lubang di masing-masing zona klasifikasi air tanah berdasarkan salinitas. Setiap lubangnya berisi 3 P10 dan 3 P12. Pemetaan intrusi air asin berdasarkan nilai salinitas menggunakan ArcGIS dari 20 titik sampel air tanah didapatkan zona timur Krueng Lamnyong terbagi menjadi 3 zona tingkatan salinitas yaitu zona II (3000-35000 ppm), zona III (1000-3000 ppm), dan zona IV (

ABSTRACT Saltwater intrusion is the process of saline water infiltrating the groundwater layer, which can elevate the groundwater's salt content, known as salinity. Elevated salinity is one of the leading causes of corrosion in reinforced concrete structures. This study aimed to map saltwater intrusion and understand its influence on the corrosion rate and remaining lifespan of government office buildings in the eastern zone of Krueng Lamnyong. Government office buildings with reinforced concrete in their main structures are particularly susceptible to the corrosive effects of saltwater intrusion. Corrosion rate measurements were conducted using BjTP 280 test specimens with diameters of 10 mm (P10) and 12 mm (P12). These specimens were cut to approximately ±5 cm in length, weighed, and then buried for 30 days in individual boreholes within each groundwater salinity classification zone. Each borehole contained 3 P10 and 3 P12 specimens. Mapping of saltwater intrusion based on salinity values was performed using ArcGIS with data collected from 20 groundwater sample points. The eastern zone of Krueng Lamnyong was divided into three salinity levels: Zone II (3000-35000 ppm), Zone III (1000-3000 ppm), and Zone IV (