Nano kaolin clay as bitumen modifier for porous asphalt
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Date
2019
Authors
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Publisher
Universiti Teknologi Malaysia
Abstract
Utilisation of nanomaterials in asphalt binder is widely explored to improve the performance of the binder. Among the potential of nanomaterials, nanoclay received much attention as a modifier in binder modification due to its low cost of production and abundance in nature especially in tropical country. This study focused on investigating the performance of porous asphalt mixture incorporating nano kaolin clay (NKC). It was carried out in three phases. In Phase 1, microstructure analysis was performed on kaolin clay (KC) to determine the optimum size and characteristic of NKC. Five samples of KC with different grinding hours consisted of 0, 5, 10, 15 and 20 hours were produced. In Phase 2, the physical and rheological tests of binder (penetration, softening point, viscosity and dynamic shear rheometer (DSR)) were conducted to determine the optimum percentage of NKC (between 0, 3, 5, 7 and 9%) in modifying the binder. Final phase which was Phase 3, involved the utilisation of NKC in porous asphalt mixture. Mechanical performance was evaluated through abrasion loss, resilient modulus, dynamic creep, porosity, permeability and indirect tensile strength (ITS). The test results show that 15 hours of grinding is the optimum grinding hours to produce NKC. Mixture consisted of 5% NKC shows better rheological property with high rutting resistance and increased failure temperature to 76ÂșC. In addition, NKC mixture recorded superior performance by reducing particle loss during abrasion impact and less susceptible to permanent deformation as compared to the control mixture. The microstructure analysis revealed that modified binder with NKC has improved the adhesion bonding with aggregate. Hence, it can be concluded that NKC is suitable to be used as a modifier in bituminous material.
Description
Thesis (PhD. (Civil Engineering)
Keywords
Asphalt cement, Bituminous materials, Porous materials