Haromaini, Haromaini and Wiyono, Sugeng and Elizar, Elizar (2025) Kajian Pengaruh Rendaman Air Gambut dan Air Laut Terhadap Karakteristik Marshall dan SEM EDS Pada Lapisan Perkerasan AC-WC. JURNAL ILMU & REKAYASA SIPIL, 01 (02). pp. 12-20.

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Abstract

Premature damage to road pavements in Indonesia is caused by waterlogging (especially peat water and seawater), which accelerates the disintegration of the asphalt layer, as well as the aging process of the asphalt mixture during production and service. The combination of these two factors reduces road durability. The objective of this study is to determine the effect of aging processes caused by exposure to peat water and seawater on AC-WC asphalt mixtures with a penetration of 60/70 based on the Marshall Test, as well as to analyze the chemical reactions using Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy (SEM-EDS). This research method involves laboratory testing with research stages starting from the design of asphalt concrete mixtures, determining the optimum asphalt content, Long Term Oven Aging (LTOA) testing of asphalt concrete in an oven for 5 days at a temperature of 85°C, chemical testing of peat water and seawater, and immersion for 0, 1, 2, 4, and 7 days. SEM testing is conducted to examine the morphology and topography of the sample surface at magnifications up to 1000x, and EDS is used to analyze the chemical composition. From this study, the results of the LTOA test specimen values due to immersion in peat water and sea water on the AC-WC mixture of 60/70 penetration based on the Marshall Test at immersion durations of 0, 1, 2, 4, and 7 days were obtained. The marshall stability value was obtained before the immersion action of 1076.5 kg of peat water and 1115.7 kg of sea water. The influence of peat water and sea water decreased the value of marshall stability, the longest immersion duration of 7 days decreased by 10%, with values of 971.9 kg and 919.6 kg meeting the limits of the Marshall Stability value which is >800 kg. SEM-EDS observations with 1000x magnification on asphalt concrete soaked with peat water and sea water showed that the asphalt morphology binds to each other to form hydration crystals in the form of flakes with the highest chemical compounds contained in the carbon chemical asphalt concrete sample of 75% and 20% oxygen. The dominant elements of Oxygen (O) and Carbon (C) in peat and sea water play an important role in accelerating the aging process and asphalt degradation, especially in environments with long-term immersion. Chemical reactions that occur in test specimens immersed in peat water (pH = 4.7) and sea water (pH = 7) accelerate the oxidation of asphaltenes, reducing the cohesion and stability of the mixture.

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