Feasibility of Roller Compacted Geopolymer Concrete Containing Recycle Concrete Aggregate

In this research, the feasibility of roller compacted geopolymer concrete (RCGPC) containing 100% recycle concrete aggregate (RCA) was investigated. Mechanical characteristics of the RCA-RCGPC composite were evaluated using a compressive strength test, and semi-circular beam test. The effects of different curing conditions (time and temperature) on compressive strength were also assessed. The durability of the material was studied using the freeze-thawing test. Microstructure and morphology investigations were also performed using X-ray diffraction (XRD). Throughout the experimentation, class F (low calcium) fly ash was used. The mixture of sodium hydroxide (NaOH) and sodium silicate (Na₂SiO₃) was used as an alkali activator. It was observed from the test results that, RCA-RCGPC has a high optimum moisture content, which was due to the higher absorption capacity of RCA. By using 8 M concentration of NaOH, Na₂SiO₃ to NaOH ratio of 1 by mass and 15% fly ash content, 60°C accelerated curing method yielded satisfactory unconfined compressive strength (UCS), semicircular bending beam (SCB) strength and durability were also found to be promising using 100% RCA aggregate. XRD analysis had also proven the formation of new chemical bonds or geopolymeric compounds in the newly formed RCA-RCGPC composite. Based on the test results, this material could be a cost-effective and durable solution to the construction of pavement structures.

• Record URL:
  • https://doi.org/10.1061/9780784483305.031
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784483305
• Supplemental Notes:
  • © 2021 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Rahman, Sk Syfur
  • Khattak, Mohammad Jamal
• Conference:
  • Tran-SET 2020
  • Date: 2020-9-1 to 2020-9-2
• Publication Date: 2021-1

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 305-313
• Monograph Title: Tran-SET 2020

Subject/Index Terms

• TRT Terms: Admixtures; Chemical analysis; Concrete aggregates; Feasibility analysis; Fly ash; Geopolymer concrete; Mechanical properties; Mechanical tests; Recycled materials; Roller compacted concrete
• Subject Areas: Environment; Highways; Materials; Pavements;

Filing Info

• Accession Number: 01762974
• Record Type: Publication
• ISBN: 9780784483305
• Files: TRIS, ASCE
• Created Date: Jan 29 2021 4:28PM