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Ain Shams University (2020)

Using Rice Husk Ash in Hot Asphalt Concrete Mixes

Ibrahim,Mohamed Mohiey Eldien Helal

Titre : Using Rice Husk Ash in Hot Asphalt Concrete Mixes \

Auteur : Ibrahim,Mohamed Mohiey Eldien Helal

Etablissement de soutenance : Ain Shams University

Grade : Master of Science (MSc) in Civil Engineering 2020

Rice husk ash (RHA) is a by- product generated from burning the rice ash. As known, burning rice husk is one of the most environmental problems in Egypt. It has negative effects on human health and life. Burning rice husk is the main cause of what is called ”black cloud”, which has negative influences on the environment and human health. Thus, in this study, RHA was used in asphalt mixes as a replacement of mineral filler to reduce limestone dust (LSD) consumption and improve the engineering properties of Hot Mix Asphalt (HMA). The main aim of replacing mineral filler is enhancing the performance of asphalt mixes and producing an economical asphalt mix. For this purpose, five different mixes were prepared. These mixes are, the control mix which has 0% RHA, while the other modified mixes contain 25, 50, 75 and 100% RHA as a percentage of the filler weight. Optimum bitumen content (OBC) was determined using Marshall test, also all Marshall parameters (Stability, Air Voids, Voids in Mineral Aggregate, Unit Weight and Flow) were examined. Indirect Tensile Strength Test (IDT) and Wheel Tracking Test (WTT) were conducted and their results were analyzed. Dynamic modulus (│E*│) is considered an important parameter used in mechanistic-empirical pavement design. The │E*|is measured at different temperature/frequency combinations. Dynamic modulus (│E*│) and phase angle (δ) are used for the visco- elastic characterization of HMA. Thus, these properties were measured for mixes with and without RHA. The results indicate that RHA has the potential to be used as partial substitution of LSD mineral filler in

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Page publiée le 1er janvier 2021