Performance of Concrete with Low-Carbon Cement Supplements and Zero-Cement

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Civil Engineering".

Deadline for manuscript submissions: 20 June 2024 | Viewed by 918

Special Issue Editor


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Guest Editor
Department of Civil Engineering, Stellenbosch University, Stellenbosch 7602, South Africa
Interests: green concrete; fiber-reinforced concrete; concrete durability; use of supplementary cementitious materials; geopolymer concrete; 3D printed concrete; creep of concrete
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Special Issue Information

Dear Colleagues,

With the significant carbon emissions from the manufacture of cement and the high energy demand, it is imperative to develop concrete with low-carbon cement supplements or zero-cement concrete, which are sustainable, environmentally friendly, and have enhanced engineering properties compared with conventional cement-based materials. Supplementary cementitious materials (SCMs) are a viable option as full or partial substitutes for cement clinkers. Further, geopolymer and alkali-activated materials with user-friendly activators hold promise for zero-cement concrete. However, mix formulations from these options must have comparable or better engineering performance than conventional concrete. Quantifying carbon savings, cost savings, and a life-cycle analysis is germane to such studies. This Special Issue seeks to publish research findings in these areas.

Prof. Dr. Adewumi John Babafemi
Guest Editor

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Keywords

  • supplementary cementitious materials
  • characterization
  • fresh properties
  • rheology
  • mechanical properties
  • durability
  • microstructure

Published Papers (1 paper)

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Research

24 pages, 18831 KiB  
Article
Effects of Waste Plastic and Glass Aggregates on the Strength Properties of Ambient-Cured One-Part Metakaolin-Based Geopolymer Concrete
by Babatunde Luke Ajayi and Adewumi John Babafemi
Appl. Sci. 2024, 14(5), 1856; https://doi.org/10.3390/app14051856 - 23 Feb 2024
Cited by 1 | Viewed by 625
Abstract
The production of Portland cement (PC) is associated with carbon emissions. One-part geopolymer “just add water” is a user- and environmentally-friendly binder that can potentially substitute PC. However, there is limited research on the setting time, fresh, and strength properties of one-part metakaolin [...] Read more.
The production of Portland cement (PC) is associated with carbon emissions. One-part geopolymer “just add water” is a user- and environmentally-friendly binder that can potentially substitute PC. However, there is limited research on the setting time, fresh, and strength properties of one-part metakaolin (MK)-based geopolymer concrete (OMGPC) incorporating recycled aggregates. Hence, the study explored the fresh, mechanical (compressive, flexural, splitting tensile, and E-modulus) and microstructural properties of ambient cured (7-, 28-, and 90-day) OMGPC containing recycled waste plastics (RESIN8) and recycled fine waste glass aggregate (FWG) at 5% and 10% by volume of the sand. The study result shows that 2% trisodium phosphate by wt. of the binder retard the initial and final setting times of OMGPC. At the same time, the incorporation of RESIN8 and FWG aggregates improved the workability of geopolymer concrete. The lightweight properties of RESIN8 aggregate reduce the hardened density of OMGPC, while the FWG specimens show a similar density to the control. The compressive strength of RESIN8 and FWG OMGPC range from 19.8 to 24.6 MPa and 26.9 to 30 MPa, respectively, compared to the control (26 to 28.9 MPa) at all curing ages. The flexural and splitting tensile strength of the OMGPC range from 2.2 to 4.5 MPa and 1.7 to 2.8 MPa, respectively. OMGPC is a viable alternative to Portland cement, and FWG can substitute sand in structural concrete by up to 10% and RESIN8 aggregate at 5% by volume of the natural sand. Full article
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