International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 05 | May 2024
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p-ISSN: 2395-0072
Effect of Short-Term Aging on the Properties of Crumb Rubber and Fumed Silica Modified Bitumen Saneesh Sabu1, Sreelatha T2 1PG Scholar, Dept. of Civil Engineering, Rajiv Gandhi Institute of Technology Kottayam, Kerala, India
2Associate Professor Dept. of Civil Engineering, Rajiv Gandhi Institute of Technology Kottayam, Kerala, India
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Abstract - Bitumen, in its pure form, could not possess all
The use of crumb rubber in bituminous binders also has adverse effects. Using high percentages of crumb rubber (CR) in asphalt pavement using the dry process can negatively impact adhesion, leading to poor mix performance, fatigue, and rutting, as well as increased susceptibility to moisture damage [3]. The settling of the crumb rubber particles in bitumen modified with crumb rubber, however, may result in storage problems [Ibrahim]. Challenges with Crumb rubber-modified asphalt include inadequate storage stability, elasticity, and high-temperature rutting [5]. Crumb rubber is a cross-linked substance that has inadequate compatibility between its particles and bitumen. Two strategies to overcome this issue include nanomaterials and pretreated CR particles [7]. The inclusion of nanomaterials, such as nano-silica, enhances storage stability. The nano-silica and crumb rubber-modified asphalt binder is stable and can be stored for long periods without settling. This property makes it ideal for paving applications [5].
the necessary properties to withstand different climatic conditions and traffic loads. By adding different additives, bitumen may be made more appropriate for usage on road pavements. This study intends to enhance bitumen characteristics and performance by modifying asphalt binder with 6% Crumb rubber and fumed silica at varying contents of 0.5%,1%, 1.5%, 2%, and 2.5% by weight of binder. This study investigates the effect of fumed silica and Crumb Rubber on the properties of bituminous binder before and after aging. The physical characteristics of the modified binders have been examined, and test results have been compared with those of the unmodified binder. The binder's characteristics were found to improve with the addition of crumb rubber and fumed silica. The maximum viscosity, softening point, and minimum penetration value are determined for the sample containing 6% crumb rubber and 1.5% fumed silica. Key Words: Bitumen, Crumb rubber, Fumed silica, Physical characteristics
Fumed silica is a cost-effective, non-toxic nanomaterial used to modify bitumen. The use of fumed silica nanoparticles may improve bitumen's mechanical and rheological properties, as well as its resistance to moisture damage and ageing [4]. The inclusion of fumed silica improves asphalt binder characteristics, including penetration index [10]. The optimal fumed silica percentage is 1.5 %. Using 1.5% fumed silica in 6% CR modification improves softening point, reduces temperature sensitivity, improves rheological characteristics, and improves low-temperature parameters [1]. Modifying bitumen with crumb rubber and fumed silica is to reduce the environmental damage caused by discarded automotive tires. Also, the modification intends to improve the properties of the bituminous binder. The study compared the physical properties of unmodified and modified bitumen binders, such as viscosity, penetration, softening point, and specific gravity.
1. INTRODUCTION Bituminous materials, often known as asphalts, are commonly utilized in road construction due to their strong binding and waterproofing capabilities, as well as their relatively cheap expense [8]. Various flaws have been identified in flexible pavements, such as cracks, rutting, and potholes [6]. Bituminous concrete mixes often deform permanently when subjected to repeated loads and hot temperatures. Global research is being conducted to enhance the qualities of asphalt concrete by using additives in the binder or mix preparation [10]. Crumb rubber is recycled from automobile tyres. Adding crumb rubber to hot bituminous mixes improves pavement performance, protects the environment, and leads to faster and more cost-effective roadways [12]. The addition of crumb rubber to a hot mix asphalt mixture is regarded as a sustainable construction technique. The use of crumb rubber as an ingredient in hotmix asphalt mixtures is regarded as a sustainable building strategy. The use of crumb rubber increased both the strength and the quality of the asphalt mix [13]. Using a dry procedure to add crumb rubber additives in varying sizes and percentages significantly improved bitumen mix characteristics and performance [2].
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2. MATERIALS 2.1 Crumb Rubber Crumb rubber is tiny pieces of discarded tire shredded from automobiles that pose a severe disposal issue [9]. Crumb rubber modification increases bitumen characteristics by improving storage and loss modulus, as well as its
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