Related references
Note: Only part of the references are listed.
Review
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Summary: This review article discusses the advantages and opportunities of additive manufacturing in the construction sector, focusing on the design methodology and required properties of cementitious material mixes suitable for 3D printing. It examines traditional materials based on Ordinary Portland Cement (OPC) and non-conventional ones such as alkali-activated materials (geopolymers). While additive manufacturing has found interesting projects in the United States, Europe, and Asia, its adoption is still in the experimental phase in Latin America. However, promising developments and research in countries like Mexico, Brazil, Chile, Colombia, Guatemala, and Peru suggest that 3D printing will become an industrial reality in the near future. This paper presents the main challenges and opportunities in implementing additive manufacturing.
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Construction & Building Technology
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(2022)
Review
Environmental Sciences
Nabila Shehata et al.
Summary: Environmental degradation and increased greenhouse gas emissions are driving the need for sustainable green building and construction materials. Geopolymer concrete (GeoC) has gained attention due to its eco-friendly properties and ability to utilize waste materials. This review investigates the synthesis processes, applications, and contributions of GeoC to sustainable development goals. By developing structurally sound GeoC from various wastes, a green circular economy can be promoted.
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Article
Green & Sustainable Science & Technology
Rafael Robayo-Salazar et al.
Summary: This article describes the recycling of coarse and fine fractions and powder from construction and demolition waste using alkaline activation technology. The study demonstrates the potential application of these CDW-based materials, such as mortars, concretes, and prefabricated units, in the construction sector. The results also show the environmental sustainability of alkali-activated CDWs compared to conventional materials based on OPC, with lower carbon footprint.
Review
Construction & Building Technology
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Summary: This paper provides a comprehensive review of the test methods used to characterize the fresh and hardened properties of 3DPC and discusses the factors influencing test techniques and future research directions for standardizing the test methods. The extensive information provided in this review will assist the engineering community and 3DPC manufacturers in selecting suitable methods or standards to test 3DPC.
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(2022)
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Summary: This study aims to evaluate the anisotropy in terms of mechanical performance and bonding properties of geopolymer mortars made from construction and demolition waste (CDW) using 3D-additive manufacturing technique. The results show that the content of alkaline activators significantly affects the mechanical properties and the bond performance between consecutive layers is one of the main factors influencing the anisotropic behavior of 3D-printed structures.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
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Summary: Printable concretes require specific rheological properties that can be improved with chemical additives, but interactions between different additives in co-assembly can affect their effectiveness.
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(2022)
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Construction & Building Technology
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Summary: By utilizing different production techniques like single-part production, pre-setting pressure and hot pressing, two-stage concreting, and 3D printing, geopolymers and alkali-activated materials can be manufactured for construction applications to replace conventional concrete. It is essential to carefully select and tailor the manufacturing methodology to overcome application problems and achieve eco-efficiency and superior engineering properties. The distinctive benefits of these materials, including rapid solidification, cost savings, resource conservation, energy consumption reduction, and lower carbon footprint, make them strong contenders in various construction applications.
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(2021)
Article
Construction & Building Technology
Siva Uppalapati et al.
Summary: This study investigates the effect of sodium carbonate and sodium sulfate on the setting process of sodium silicate-activated slag-fly ash cements. The results show that the partial substitution of activators has no noticeable effect on the initial setting time, but significantly increases the final setting time. The condensation reaction between aluminosilicate units near the particle surface is likely responsible for setting, and a specific ultrasonic velocity range can be used to estimate the setting times of the studied cements.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
William Valencia-Saavedra et al.
Summary: The article demonstrates the feasibility of producing alkali-activated hybrid cements using sodium sulfate and sodium carbonate as activators. By adjusting the material proportions and activator dosages, concretes with high compressive strength can be obtained, and their performance remains stable after prolonged curing.
Article
Construction & Building Technology
Shantanu Bhattacherjee et al.
Summary: This paper examines the sustainability aspects of binders used in concrete 3D concrete printing, emphasizing the importance of reducing embodied impacts to enhance sustainability potential. It reviews literature on different binder systems and explores alternative binders, highlighting the effect of using supplementary cementing materials and alternative binder systems for improving the sustainability of 3D printed structures. By quantifying environmental impacts, the paper illustrates the potential of sustainability assessment in terms of energy consumption and CO2 emissions with different binder systems.
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(2021)
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Construction & Building Technology
Oguzhan Sahin et al.
Summary: The paper evaluates the rheological properties of ambient-cured 100% construction and demolition waste (CDW)-based geopolymers for 3-dimensional additive manufacturing (3D-AM). The study shows that these geopolymers can be successfully used for 3D-printing at a laboratory scale with adequate rheological and mechanical properties without additional chemical admixtures. The empirical test methods used are effective in assessing the suitability of CDW-based geopolymers for 3D-AM applications.
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(2021)
Article
Construction & Building Technology
Navid Ranjbar et al.
Summary: This study presents a two-step approach for quantifying concrete printability through dynamic mode rheological measurements: modeling shearing history during extrusion and monitoring the hardening evolution of deposited material. By applying this method, the static yield stress at the origin can be quantified to determine the material printability, ensuring shape stability of the printed structure.
CEMENT AND CONCRETE RESEARCH
(2021)
Review
Green & Sustainable Science & Technology
Jihui Zhao et al.
Summary: Geopolymer is an environmentally friendly material that can replace traditional cement by utilizing industrial wastes, but there are still some performance shortcomings that need to be improved. Recent research shows that the properties of geopolymer materials can be significantly enhanced by methods such as additives.
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