A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Influence of reclaimed asphalt pavement aggregate on the performance of metakaolin-based geopolymer concrete at ambient and elevated temperatures
Highlights Investigated the behavior of metakaolin-based geopolymer concrete at ambient, 300 °C and 600 °C. Five mixes with 0%, 25%, 50%, and 100% reclaimed asphalt pavement aggregate were cast. Tests included stress–strain behavior and flexural strength. Reclaimed asphalt aggregate reduced compressive and flexural strengths. Reclaimed asphalt pavement aggregate improved the strain capacity of the geopolymer concrete. Proposed models for predicting the elastic modulus, strain at peak strength and flexural strength.
Abstract Considering the environmental concerns surrounding conventional cement concrete production and the increasing demand for more sustainable and green materials, recent research considered utilization of recycled waste materials (e.g., aggregates from concrete construction and demolition, and reclaimed asphalt pavement) as full or partial substitutes for natural aggregates. Another direction of the research considered the production of more sustainable binders as an alternative to conventional cement (e.g., geopolymer or alkali-activated materials). To serve the objective of utilizing waste materials and reducing negative environmental impact associated with the use of cement concrete, the present study investigated the potential of producing metakaolin-based geopolymer concrete incorporating reclaimed asphalt pavement (RAP) aggregate. This research comprised experimental testing of five concrete mixes with 0%, 25%, 50% and 100% coarse RAP aggregate replacing the natural aggregate. Tests included compressive stress–strain behavior at ambient conditions (i.e., compressive strength, elastic modulus, strain at peak strength and toughness), and flexural strength. The performance after heat exposure to elevated temperatures of 300 °C and 600 °C was also tested. Proposed models for predicting the elastic modulus, strain at peak strength, flexural strength, and compressive stress–strain relationship matched the experimental results well. Results indicated that natural aggregate replacement by 25 % RAP aggregate caused a reduction in the compressive and flexural strengths by 42.8% and 26.2%, respectively. The increase in the RAP aggregate content enhanced the strain at peak strength e.g., the strain at peak strength was 42.9% higher than the control mix when 100% RAP aggregate was utilized.
Influence of reclaimed asphalt pavement aggregate on the performance of metakaolin-based geopolymer concrete at ambient and elevated temperatures
Highlights Investigated the behavior of metakaolin-based geopolymer concrete at ambient, 300 °C and 600 °C. Five mixes with 0%, 25%, 50%, and 100% reclaimed asphalt pavement aggregate were cast. Tests included stress–strain behavior and flexural strength. Reclaimed asphalt aggregate reduced compressive and flexural strengths. Reclaimed asphalt pavement aggregate improved the strain capacity of the geopolymer concrete. Proposed models for predicting the elastic modulus, strain at peak strength and flexural strength.
Abstract Considering the environmental concerns surrounding conventional cement concrete production and the increasing demand for more sustainable and green materials, recent research considered utilization of recycled waste materials (e.g., aggregates from concrete construction and demolition, and reclaimed asphalt pavement) as full or partial substitutes for natural aggregates. Another direction of the research considered the production of more sustainable binders as an alternative to conventional cement (e.g., geopolymer or alkali-activated materials). To serve the objective of utilizing waste materials and reducing negative environmental impact associated with the use of cement concrete, the present study investigated the potential of producing metakaolin-based geopolymer concrete incorporating reclaimed asphalt pavement (RAP) aggregate. This research comprised experimental testing of five concrete mixes with 0%, 25%, 50% and 100% coarse RAP aggregate replacing the natural aggregate. Tests included compressive stress–strain behavior at ambient conditions (i.e., compressive strength, elastic modulus, strain at peak strength and toughness), and flexural strength. The performance after heat exposure to elevated temperatures of 300 °C and 600 °C was also tested. Proposed models for predicting the elastic modulus, strain at peak strength, flexural strength, and compressive stress–strain relationship matched the experimental results well. Results indicated that natural aggregate replacement by 25 % RAP aggregate caused a reduction in the compressive and flexural strengths by 42.8% and 26.2%, respectively. The increase in the RAP aggregate content enhanced the strain at peak strength e.g., the strain at peak strength was 42.9% higher than the control mix when 100% RAP aggregate was utilized.
Influence of reclaimed asphalt pavement aggregate on the performance of metakaolin-based geopolymer concrete at ambient and elevated temperatures
Albidah, Abdulrahman S. (author)
2023-08-09
Article (Journal)
Electronic Resource
English
Feasibility of Reclaimed Asphalt Pavement Geopolymer Concrete as a Pavement Construction Material
| Springer Verlag | 2023
Use of reclaimed asphalt pavement as an aggregate in asphalt concrete
| British Library Conference Proceedings | 2007
Unsaturated properties of recycled concrete aggregate and reclaimed asphalt pavement
| British Library Online Contents | 2013