The role of physical and chemical methods of nanohydrated lime production on properties of bituminous binders

Nanomaterials are employed to improve bitumen's rheological properties and mechanical characteristics of asphalt mixes. The high cost of production of nanomaterials is one of the obstacles that has limited their application in road pavements. In this research, two methods of production of nanomaterials have been used to produce Nano Hydrated Lime (NHL); a mechanical process, using a planetary ball mill, and a chemical process in which some chemicals are dissolved in distilled water and then dried. The nanoparticle sizes were evaluated using Field Emission Scanning Electron Microscopy (FESEM) and Dynamic Light Scattering (DLS) tests. These were at different grinding times in the physical method, and at different solution concentrations of Calcium Nitrate (Ca(NO₃)₂) and Sodium Dodecyl Sulfate (SDS) in the chemical method. The average sizes of the nanoparticles in the physical method were 211 nm in DLS and 114 nm in FESEM (after 6 h of grinding). In the chemical method, these were 379 nm in DLS and 124.6 nm in FESEM at concentration of 3 ml of Ca(NO₃)₂ solution. X-Ray Diffraction (XRD) and X-Ray Fluorescence (XRF) analysis indicated that in the physical process, higher nanolime particles were achieved. Physical properties of two bitumen types (60/70 and 85/100 penetration grades) that were modified with 2 %, 4 %, and 6 % NHL were determined using Dynamic Shear Rheometer (DSR) and Rotational Viscometer (RV) tests. Adhesion properties of the nano modified binders with three aggregate types (namely, limestone, silica, and granite) were determined using Boiling Water and Pull-Off tests. Digital images were analyzed after processing, using Digimizer Software to evaluate the percentages of the coated aggregate particles. The results indicated that the addition of 4 % NHL (in physical production method) improved best the bitumen properties. In fact with limestone aggregates, the adhesive strength ratio was increased by 38 %. Coating of bitumen on the limestone aggregates was better than that in siliceous and granite aggregates. As a result of this, the stripping percentages of the limestone aggregates were decreased the most with the addition of NHL. Finally, properties of the 60/70 pen bitumen, modified with NHL, were better than those of the 85/100 pen bitumen.

• Record URL:
  • https://doi.org/10.1016/j.conbuildmat.2024.138794
• Record URL:
  • http://www.sciencedirect.com/science/article/pii/S0950061824039369
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09500618
• Supplemental Notes:
  • © 2024 Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies. Abstract reprinted with permission of Elsevier.
• Authors:
  • Mohammed, Ahmed Sundus
  • Kavussi, Amir
  • 0000-0002-3195-7329
  • Manteghian, Mehrdad
• Publication Date: 2024-11-15

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: 138794
• Serial:
  • Construction and Building Materials
  • Volume: 451
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 0950-0618
  • Serial URL: http://www.sciencedirect.com/science/journal/09500618?sdc=1

Subject/Index Terms

• TRT Terms: Bituminous binders; Calcium hydroxide; Nanostructured materials; Physical properties; Production methods
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01937678
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 21 2024 9:26AM