Bachelor of Science in Civil and Environmental Engineering

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Browsing Bachelor of Science in Civil and Environmental Engineering by Author "Amule Lokorto Moise"

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    Accessing the Use of Calcined Quartzite Dust as a Fillertoenhance Rut Resistance in Asphalt Concrete
    (Uganda Christian University, 2025-04-17) Amule Lokorto Moise
    Worldwide flexible pavements are mainly constructed with aggregates, bitumen and filler. This study aims to assess the use of Calcined quarzite dust (CQD) to enhance rut resistance in the asphalt concrete. The methods used were mechanical,physical, chemical to determine the engineering properties of aggregate, bitumen and filler used in this study; also Marshall test was conducted, as well as the Indirect tensile Strength (ITS) in relation with the Wheel Tracking Tests (WTT) to assess the performance on the asphalt mixture. Various tests were done during the study, various factors such as stability, flow, air voids,voids filled with binder (VFB), and voids in the mineral aggregate (VMA) were evaluated. The study was conducted with CDQ percentage variation of 2%, 4% and 6% and 4.4% optimum bitumen content was obtained from the neat asphalt. The results of the study showed that the use of Calcined quarzite dust led to an increase in Marshall stability from 15kN to 21.1 kN, increased Indirect Tensile Strength Strength ratio from 82% to 88%, ITS dry from 900.2kPa to 1,130.6kPa and ITS wet from 740kPa to 990kPa. With relation to wheel tracking tests the ITS value greater than 800kPa expect less than 10mm rutting depth for a 20,000 cycles passes. This study therefore shows that asphalt mixes with 4.5% CQD in the asphalt mixture can be used as a means to enhance the stability and stiffness.