Related references
Note: Only part of the references are listed.
Review
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Article
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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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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.
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(2021)
Article
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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
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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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Review
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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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