Soil-Recycled Aggregate-Geopolymer Road Base/Subbase Mixtures - Step Towards Sustainability

The proposed study focuses on the development and evaluation of sustainable Soil-Recycled Aggregate-Geopolymer (Soil-RAG-GP) mixtures for road base and subbase layers. In order to develop Soil-RAG-GP stabilized road base materials, various types of Class F fly ash, soil types, and activation agents (such as sodium hydroxide and sodium silicate) will be tested. The mechanical characteristics of the Soil-RAG-GP mixtures depend on various mix constituents, as well as the curing period and temperatures. Based on various combinations of variables, a statistical-based partial factorial experimental design will be developed to minimize mechanical testing. Unconfined Compressive strength, elastic and dynamic modulus, flexural, durability and shrinkage characteristics will be evaluated using standard test procedures. In addition to mechanical testing, oxide analyses and SEM micrographs will also be studied to understand the basic morphology and microstructure of Soil-RAG-GP to investigate the extent of Geopolymer reactions and strength gain mechanism with time. The mixes will be cured at various temperatures before testing. The strength and modulus tests results will be compiled, and preliminary statistical model will be developed to relate the strength with mix variables. The model will assist in sensitivity analysis of variables and determine the optimum/practical mix design parameters to be used in base/subbase layers. The developed “green” Geopolymer-based soil base/subbase materials will exhibit durability, high performance, and environment-friendly, and sustainability characteristics.

• Supplemental Notes:
  • 18GTLSU10

Language

• English

Project

• Status: Completed
• Funding: $89148
• Contract Numbers:

  69A3551747106

• Sponsor Organizations:

  Department of Transportation

  Intelligent Transportation Systems Joint Program Office
  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Managing Organizations:

  Department of Transportation

  Intelligent Transportation Systems Joint Program Office
  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  Transportation Consortium of South-Central States (Tran-SET)

  Louisiana State University
  Baton Rouge, LA  United States  70803
• Project Managers:

  Hassan, Marwa

• Performing Organizations:

  University of Louisiana at Lafayette

  104 University Circle
  Lafayette, LA  United States  70503
• Principal Investigators:

  Khattak, Mohammad

• Start Date: 20180315
• Expected Completion Date: 20190915
• Actual Completion Date: 20190915
• USDOT Program: University Transportation Centers

Subject/Index Terms

• TRT Terms: Base course (Pavements); Durability; Fly ash; Geopolymer concrete; Mechanical properties; Mix design; Recycled materials; Subbase materials
• Subject Areas: Geotechnology; Highways; Materials; Pavements;

Filing Info

• Accession Number: 01664124
• Record Type: Research project
• Source Agency: Transportation Consortium of South-Central States (Tran-SET)
• Contract Numbers: 69A3551747106
• Files: UTC, RIP
• Created Date: Mar 23 2018 4:47PM