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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 5 Abstracts search results
Document:
SP-362_78
Date:
June 18, 2024
Author(s):
Yeakleang Muy, Luc Courard, Xavier Garnavault, David Bulteel, Sébastien Rémond, Maria Taleb, and Julien Hubert
Publication:
Symposium Papers
Volume:
362
Abstract:
This study focuses on evaluating the mechanical, microstructural, and durability properties of 3D printing mortar (3DPM), with a specific emphasis on the influence of incorporating recycled fine aggregates (RFA). These RFA are produced from construction and demolition waste (C&DW) in Belgium and are sieved to a maximum particle size of 2 mm [0.08 in]. Cast and printed samples of mortar containing 100% RFA, with a sand-to-cement ratio of approximately 1:1 and a water-to-cement ratio of 0.29, were subjected to mechanical tests, including flexural, compressive, and tensile strength, at 2, 7, 28, and 56 days. The possible anisotropic behavior of the printed material was also investigated. The results show that using RFA does not significantly affect the mechanical properties of the mortar, and some anisotropic behavior was observed based on the compression test results. The end goal of the project is to print non-reinforced urban furniture; in order to assess its durability, only freezing and thawing (F-T) behavior was investigated. The F-T behavior was analyzed based on the quantity of spalling particles after 7, 14, 28, 56, and 91 F-T cycles. The results show that up to 91 F-T cycles, no significant surface damage occurred.
This study focuses on evaluating the mechanical, microstructural, and durability properties of 3D printing mortar (3DPM), with a specific emphasis on the influence of incorporating recycled fine aggregates (RFA). These RFA are produced from construction and demolition waste (C&DW) in Belgium and are sieved to a maximum particle size of 2 mm [0.08 in].
Cast and printed samples of mortar containing 100% RFA, with a sand-to-cement ratio of approximately 1:1 and a water-to-cement ratio of 0.29, were subjected to mechanical tests, including flexural, compressive, and tensile strength, at 2, 7, 28, and 56 days. The possible anisotropic behavior of the printed material was also investigated. The results show that using RFA does not significantly affect the mechanical properties of the mortar, and some anisotropic behavior was observed based on the compression test results. The end goal of the project is to print non-reinforced urban furniture; in order to assess its durability, only freezing and thawing (F-T) behavior was investigated. The F-T behavior was analyzed based on the quantity of spalling particles after 7, 14, 28, 56, and 91 F-T cycles. The results show that up to 91 F-T cycles, no significant surface damage occurred.
DOI:
10.14359/51742028
SP-362_25
June 11, 2024
Haodao Li, Alfred Addai-Nimoh, and Kamal H. Khayat
The emergence of 3D printing (3DP) technology in construction is limited by the overdependence on conventional Portland cement (PC). This is problematic in remote areas where procuring large quantities of raw materials requires sourcing from greater distances. Additionally, the rapid decline of coal combustion limits the availability of fly ash. This study aims to evaluate the feasibility of substituting high content (larger than 50%) of PC with natural pozzolans, including clay, pumice, and natural zeolite, as well as limestone filler that can be suitable for 3DP. The binder combinations were initially optimized to enhance packing density and robustness by evaluating the minimum water content and relative water demand of cement paste. A series of assessment methods, including slump flow loss test, rheological test, filtration test, axial deformation test, and unconfined uniaxial compression test, were carried out to determine the extrudability and shape stability of mortar made with the optimized binder candidates. Finally, the printability of these mixtures was validated using an extrusion-based 3D printer.
10.14359/51740895
SP359_04
November 1, 2023
Jacob D. Henschen, Daniel Blood, Shiho Kawashima, Heather A. Kirkvold
359
Additive manufacturing using material deposition methods continues to be a rapidly expanding field. Researchers have now begun to adapt these manufacturing methods to include cementitious materials. The impact on concrete design and construction methods are expected to undergo significant changes as a result of this new technology. However, as with adopting any new technology, knowledge transfer is critical to assure successful implementation. For engineers, this knowledge transfer begins with their coursework and faculty who can encourage students to explore new areas and readily apply what they learn. Since the field of printing concrete is still emerging, many of the applications and impacts of the technology are not adequately characterized. Furthermore, the technology itself has not been fully investigated or included in design literature. Incorporating ambiguity, multi-disciplinary teams, and open-ended problems successfully in undergraduate and graduate courses can be challenging. The goal of this paper is to advise faculty who wish to incorporate additive manufacturing topics related to cementitious materials in their courses.
10.14359/51740290
CI4404Silva
April 1, 2022
Wilson Ricardo Leal da Silva and Martin Kaasgaard
Concrete International
44
Issue:
4
There is a need to further study mixtures for three-dimensional concrete printing (3DCP) that incorporate fractions of large aggregates to develop more robust composition and achieve a feedstock with lower embodied energy. The main scope of this article is the scaling up of the solid constituents in such 3DCP mixtures.
CI4309deSilva
September 1, 2021
Wilson Ricardo Leal da Silva and Roberto Naboni
43
9
Extrusion-based, three-dimensional concrete printing (3DCP) is one of the main areas of development in architectural and construction robotics, however, the process remains characterized by limited levels of automation. To move 3DCP closer to a truly automated digital fabrication, a group of Danish researchers and companies established the 3DLOOP project.
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