BASE DERIVED FROM RAP AND LATERITIC SOIL MIXED WITH CEMENT
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Abstract
This research aims to: 1) study the development of compressive strength and durability performance of composite mixtures consisting of lateritic soil, Recycled Asphalt Pavement (RAP), and Portland cement type 1 for application as an innovative material in pavement base course construction; 2) analyze the engineering influence of controlled variables, including RAP content, optimum moisture content, cement content, and curing period, on the development of mechanical properties; 3) evaluate the compliance of the mixture properties compared to the pavement standards of the Department of Rural Roads; and 4) synthesize engineering and microstructural supporting data for the practical implementation of recycled materials in the construction industry. The research methodology utilized laboratory engineering tests by preparing mixture samples with RAP to lateritic soil weight ratios of 100:0, 0:100, 90:10, 80:20, 70:30, 60:40, and 50:50, and stabilized with cement at 0%, 1.5%, 3%, and 4.5% by weight. The testing process included modified compaction to determine maximum dry density and optimum moisture content, California Bearing Ratio (CBR) testing, and microstructural analysis using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) to explain chemical bonding mechanisms. The research results revealed that the mixtures of Sample Set C (90:10 RAP to lateritic soil) and Sample Set D (80:20 RAP to lateritic soil), when stabilized with 3% cement, achieved CBR values of 152.52% and 148.87%, respectively, which significantly exceed the criteria specified by pavement base standards. This study demonstrates that integrating recycled pavement waste with cement enhances load-bearing efficiency and serves as an innovative alternative that adds value to waste materials for optimal resource management in the road construction industry.
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