A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Sustainable reuse of excavated soil and recycled concrete aggregate in manufacturing concrete blocks
Highlights Concrete block is fabricated with recycled concrete aggregates and excavated soil. Effects of RCA and excavated soil contents on the properties of blocks are studied. Water resistance and wetting–drying performance of concrete blocks are evaluated. Concrete blocks with excavated soils exhibit superior wetting–drying resistance. Soil/RCAs ratio considerably affects life cycle performance of concrete blocks.
Abstract This paper investigates the properties of concrete blocks manufactured with excavated soil (ES) and recycled concrete aggregates (RCAs). The influences of cement dosage and RCAs (or ES) content on the physical and mechanical properties of the concrete blocks were evaluated. Effects of water immersion and wetting–drying cycles on the compressive strength of the concrete blocks were also investigated, followed by a microstructural characterization on the reaction products. Finally, a cradle-to-gate Life Cycle Assessment (LCA) was conducted to assess the environmental benefits of the green concrete blocks. The results indicate that increasing either the cement dosage or the RCA content can improve the physical and mechanical properties of the concrete blocks. Concrete blocks with a higher cement content or RCA content show better water resistance and only 10% reduction in compressive strength after a 24-hour water immersion. Whereas, the compressive strength of ES-based concrete blocks is enhanced by 20% to 80% after exposing to wetting–drying cycles, particularly for those with a higher ES content. This is mainly attributed to the pozzolanic reaction of smectite in the ES, as evidenced by the enhanced cumulative hydration heat after the incorporation of ES as well as the reduced peak intensities of smectite and calcium hydroxide in XRD results. The LCA demonstrates that increasing the RCA content in concrete blocks increases the energy consumption and global warming potential, but decreases the saved land occupation and transformation. These findings open up new possibility to manufacture eco-friendly concrete blocks containing ES and RCAs considering their mechanical properties and environmental benefits.
Sustainable reuse of excavated soil and recycled concrete aggregate in manufacturing concrete blocks
Highlights Concrete block is fabricated with recycled concrete aggregates and excavated soil. Effects of RCA and excavated soil contents on the properties of blocks are studied. Water resistance and wetting–drying performance of concrete blocks are evaluated. Concrete blocks with excavated soils exhibit superior wetting–drying resistance. Soil/RCAs ratio considerably affects life cycle performance of concrete blocks.
Abstract This paper investigates the properties of concrete blocks manufactured with excavated soil (ES) and recycled concrete aggregates (RCAs). The influences of cement dosage and RCAs (or ES) content on the physical and mechanical properties of the concrete blocks were evaluated. Effects of water immersion and wetting–drying cycles on the compressive strength of the concrete blocks were also investigated, followed by a microstructural characterization on the reaction products. Finally, a cradle-to-gate Life Cycle Assessment (LCA) was conducted to assess the environmental benefits of the green concrete blocks. The results indicate that increasing either the cement dosage or the RCA content can improve the physical and mechanical properties of the concrete blocks. Concrete blocks with a higher cement content or RCA content show better water resistance and only 10% reduction in compressive strength after a 24-hour water immersion. Whereas, the compressive strength of ES-based concrete blocks is enhanced by 20% to 80% after exposing to wetting–drying cycles, particularly for those with a higher ES content. This is mainly attributed to the pozzolanic reaction of smectite in the ES, as evidenced by the enhanced cumulative hydration heat after the incorporation of ES as well as the reduced peak intensities of smectite and calcium hydroxide in XRD results. The LCA demonstrates that increasing the RCA content in concrete blocks increases the energy consumption and global warming potential, but decreases the saved land occupation and transformation. These findings open up new possibility to manufacture eco-friendly concrete blocks containing ES and RCAs considering their mechanical properties and environmental benefits.
Sustainable reuse of excavated soil and recycled concrete aggregate in manufacturing concrete blocks
Luo, Wenjie (author) / Liu, Shu (author) / Hu, Yunfeng (author) / Hu, Dongdong (author) / Kow, Kien-Woh (author) / Pang, Chengheng (author) / Li, Bo (author)
2022-05-18
Article (Journal)
Electronic Resource
English
Study on thermal properties of recycled aggregate concrete and recycled concrete blocks
| British Library Online Contents | 2015
Study on thermal properties of recycled aggregate concrete and recycled concrete blocks
| Online Contents | 2015
Sustainable Masonry: Mortar Containing Biochar and Recycled Aggregate in Concrete Blocks
| BASE | 2019