Micro-macro characterizations of mortar containing construction waste fines as replacement of cement and sand: A comparative study

Wu, Huixia; Hu, Ruihan; Yang, Dingyi; Ma, Zhiming

doi:10.1016/j.conbuildmat.2023.131328

Cited by 77 publications

(27 citation statements)

References 66 publications

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“…As previously mentioned, the 3DCP industry is attempting to improve sustainability in construction and reduce material waste, which currently plagues this industry [2]. Reducing construction waste is especially important for the 3DCP industry, as concrete and brick are the two materials that contribute most to construction waste [9]. In this regard, a study conducted by Wu et al discussed the use of construction waste as a replacement for cement [9].…”

Section: State Of 3dcp Technologymentioning

confidence: 99%

“…Reducing construction waste is especially important for the 3DCP industry, as concrete and brick are the two materials that contribute most to construction waste [9]. In this regard, a study conducted by Wu et al discussed the use of construction waste as a replacement for cement [9]. Aligning with the overarching goals of the 3DCP industry, this new type of mixture has the potential to be used in the 3DCP industry [9].…”

Section: State Of 3dcp Technologymentioning

confidence: 99%

“…In this regard, a study conducted by Wu et al discussed the use of construction waste as a replacement for cement [9]. Aligning with the overarching goals of the 3DCP industry, this new type of mixture has the potential to be used in the 3DCP industry [9]. During the study conducted by Wu et al, it was found that ground brick and concrete waste are viable replacements for part of the cement and sand that is typically used in a concrete mixture [9].…”

Section: State Of 3dcp Technologymentioning

confidence: 99%

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A Structural and Thermal Comparative Review of 3D-Printed Wall Shapes

Bello

Memari

2023

Designs

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This article explores several aspects of the three-dimensional concrete printing (3DCP) industry. More specifically, it begins with a literature review discussing the background of this technology. This literature review also explores several of the challenges that the industry is currently facing. In this way, a knowledge gap is identified. More specifically, there are few studies that have explored the structural and thermal performance of typical walls printed in this industry. Therefore, we used the simulation tool in SolidWorks to examine the structural behavior of several different wall types when pressure was applied to the exterior face. In addition to this, the thermal performance of different wall types was also studied in SolidWorks by applying a temperature difference between the exterior and interior faces of each wall. For example, one wall shape in this study had minimum factor of safety of approximately 100 due when a load was applied, and the same wall lost approximately 212 W due to the temperature difference applied in this study. Finally, SolidWorks was used to calculate the moment of inertia of the cross sections of several of these walls, which helped to provide a better understanding of each wall’s structural rigidity.

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Section: State Of 3dcp Technologymentioning

confidence: 99%

Section: State Of 3dcp Technologymentioning

confidence: 99%

Section: State Of 3dcp Technologymentioning

confidence: 99%

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A Structural and Thermal Comparative Review of 3D-Printed Wall Shapes

Bello

Memari

2023

Designs

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“…The rapid growth of urban populations and construction has resulted in the generation of vast quantities of construction waste. However, the conventional approach to disposing of urban construction waste in landfills has led to various social and environmental problems [ 25 ]. Apart from industrial waste, another problem is construction waste, such as concrete and brick waste fines; waste could be reduced by recycling and repurposing waste materials, which could help to mitigate the environmental effects and preserve natural resources [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, the conventional approach to disposing of urban construction waste in landfills has led to various social and environmental problems [ 25 ]. Apart from industrial waste, another problem is construction waste, such as concrete and brick waste fines; waste could be reduced by recycling and repurposing waste materials, which could help to mitigate the environmental effects and preserve natural resources [ 25 ]. Approaches such as nanotechnology have a significant potential to advance the construction industry, particularly in concrete production [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Analysis of Thermally Treated Geopolymer Incorporated with Neodymium

et al. 2023

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The following investigation presents the thermal treatment of geopolymer at 300 °C, 600 °C and 900 °C. We investigated what happens to the geopolymer base when incorporated with 1% and 5% of neodymium in the form Nd2O3. A total of six samples were synthesized. Geopolymer 1 contained 1% and geopolymer 2 contained 5% Nd2O3, and these samples were treated at 300 °C; then, samples geopolymer 3 and geopolymer 4 also had the same percentage composition of Nd2O3 and were treated at 600 °C, while samples geopolymer 5 and geopolymer 6were treated at 900 °C. Physical and chemical changes in the aluminosilicate geopolymer matrix were monitored. The incorporation of rare earths into the polymer network of aluminosilicates has been proven to disrupt the basic structure of geopolymers; however, with increased temperatures, these materials show even more unusual properties. Diffuse reflectance infrared Fourier transform (DRIFT) analysis showed that the intensity of the vibrational band decreases with the increase in temperature during thermal treatment, suggesting alterations in the chemical structure of the geopolymers. Transmission electron microscopy (TEM) analysis showed that the diameter of the nanoparticles containing Al2O3 is in the range 5–10 nm, while larger crystallites range from 30 to 80 nm. Scanning electron microscopy (SEM) analysis revealed that the temperature of the thermal treatment increases to 300 °C and 600 °C; the porosity of geopolymer increases in the form of the appearance of large pores and cracks in material. X-ray photoelectron spectroscopy (XPS) analysis was used to investigate the surface chemistry of geopolymers, including the chemical composition of the surface, the oxidation state of the elements, and the presence of functional groups. The UV/Vis spectra of the synthesized geopolymers doped with Nd3+ show interesting optical properties at 900 °C; the geopolymer matrix completely disintegrates and an amorphous phase with a rare-earth precipitate appears.

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