Fresh and mechanical properties of low-cement mortars for 3D printing

Klyuev, Sergey; Klyuev, A.V.; Федюк, Роман; Ageeva, Marina; Фомина, Е. В.; Amran, Mugahed; Murali, G.

doi:10.1016/j.conbuildmat.2022.127644

Cited by 14 publications

(12 citation statements)

References 36 publications

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“…of binder) [ 30 , 51 , 52 , 112 ] or high quantities (around 70% wt. of binder) [ 46 , 90 , 113 , 114 ] of FA has been studied by several authors to fulfil printing requirements and reduce cement amount of 3DPCC mixtures. FA as a cement replacement (from 50 to 80% wt.)…”

Section: Powder Constituent Materials: Characterization and Effectmentioning

confidence: 99%

3D Construction Printing Standing for Sustainability and Circularity: Material-Level Opportunities

Fonseca¹,

Matos

2023

Materials

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Three-dimensional Cementitious materials Printing (3DCP) is a cutting-edge technology for the construction industry. Three-dimensional printed buildings have shown that a well-developed automated technology can foster valuable benefits, such as a freeform architectural design without formworks and reduced human intervention. However, scalability, commercialization and sustainability of the 3DPC technology remain critical issues. The current work presents the ecological fragility, challenges and opportunities inherent in decreasing the 3DCP environmental footprint at a material level (cementitious materials and aggregates). The very demanding performance of printable mixtures, namely in a fresh state, requires high dosages of cement and supplementary cementitious materials (SCM). Besides the heavy carbon footprint of cement production, the standard SCM availability might be an issue, especially in the longer term. One exciting option to decrease the embodied CO2 of 3DCP is, for example, to incorporate alternative and locally available SCM as partial cement replacements. Those alternative SCM can be wastes or by-products from industries or agriculture, with no added value. Moreover, the partial replacement of natural aggregate can also bring advantages for natural resource preservation. This work has highlighted the enormous potential of 3DCP to contribute to reducing the dependence on Portland cement and to manage the current colossal wastes and by-products with no added value, shifting to a Circular Economy. Though LCA analysis, mixture design revealed a critical parameter in the environmental impact of 3DCP elements or buildings. Even though cement significantly affects the LCA of 3DCP, it is crucial to achieving adequate fresh properties and rheology. From the literature survey, mixtures formulated with alternative SCM (wastes or by-products) are still restricted to rice husk ash, Municipal Solid Waste ashes and recycled powder from construction and demolition wastes. Natural aggregate replacement research has been focused on recycled fine sand, mine tailing, copper tailing, iron tailing, ornamental stone waste, recycled glass, crumb rubber, rubber powder and granules, recycled PET bottles and steel slag. However, flowability loss and mechanical strength decrease are still critical. Research efforts are needed to find low-carbon cement replacements and mix-design optimization, leading to a more sustainable and circular 3DCP while ensuring the final product performance.

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Section: Powder Constituent Materials: Characterization and Effectmentioning

confidence: 99%

3D Construction Printing Standing for Sustainability and Circularity: Material-Level Opportunities

Fonseca¹,

Matos

2023

Materials

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“…The μ value shown in the figure is based on exposure to photons at a 0.662 MeV energy level. Additives such as silica fume [ 130 ], GGBS [ 131 , 132 , 133 , 134 ], rice husk ash [ 135 , 136 ], palm oil fuel ash [ 137 , 138 , 139 , 140 , 141 ], and fly ash [ 142 , 143 , 144 , 145 , 146 , 147 , 148 , 149 , 150 , 151 ] serve as a partial cement replacement, which aims to reduce the carbon footprint of concrete [ 152 , 153 , 154 , 155 , 156 , 157 ]. The 60% increase in the fly ash replacement for cement in concrete reduced the μ value by 10% [ 63 ].…”

Section: Radiation Shieldingmentioning

confidence: 99%

Recent Trends in Advanced Radiation Shielding Concrete for Construction of Facilities: Materials and Properties

et al. 2022

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Nuclear energy offers a wide range of applications, which include power generation, X-ray imaging, and non-destructive tests, in many economic sectors. However, such applications come with the risk of harmful radiation, thereby requiring shielding to prevent harmful effects on the surrounding environment and users. Concrete has long been used as part of structures in nuclear power plants, X-ray imaging rooms, and radioactive storage. The direction of recent research is headed toward concrete’s ability in attenuating harmful energy radiated from nuclear sources through various alterations to its composition. Radiation shielding concrete (RSC) is a composite-based concrete that was developed in the last few years with heavy natural aggregates such as magnetite or barites. RSC is deemed a superior alternative to many types of traditional normal concrete in terms of shielding against the harmful radiation, and being economical and moldable. Given the merits of RSCs, this article presents a comprehensive review on the subject, considering the classifications, alternative materials, design additives, and type of heavy aggregates used. This literature review also provides critical reviews on RSC performance in terms of radiation shielding characteristics, mechanical strength, and durability. In addition, this work extensively reviews the trends of development research toward a broad understanding of the application possibilities of RSC as an advanced concrete product for producing a robust and green concrete composite for the construction of radiation shielding facilities as a better solution for protection from sources of radiation. Furthermore, this critical review provides a view of the progress made on RSCs and proposes avenues for future research on this hotspot research topic.

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“…Mixing consists of the evolution of a wet granular state to a granular microstructure suspension [11]. The mixing process is a key element in achieving good quality concrete [18,24,25]. In the current scenario, adequate mixing is not carried out by the concrete manufacturer.…”

Section: Importance Of Mixingmentioning

confidence: 99%

Effects of Admixtures on Energy Consumption in the Process of Ready-Mixed Concrete Mixing

et al. 2022

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The production and utilization of concrete and concrete-based products have drastically increased with the surge of construction activities over the last decade, especially in countries such as China and India. Consequently, this has resulted in a corresponding increase in the energy used for the production of ready-mixed concrete. One approach to reduce the cost of concrete manufacturing is to reduce the energy required for the manufacturing process. The main hypothesis of this study is that the power required for mixing the concrete can be reduced through the use of mineral admixtures in the mix design. Optimization of energy consumption during mixing using admixtures in concrete manufacturing is the predominant focus of this article. To achieve this objective, power consumption data were measured and analyzed throughout the concrete mixing process. The power consumption curve is the only source to distinguish the behavior of the different materials used in the concrete in a closed chamber. In the current research, fly ash and ground granulated blast-furnace slag (GGBS) were used as mineral admixtures to produce ready-mixed concrete. The experimental study focused on the influence of GGBS and fly ash on power consumption during concrete mixing. The results indicated that the use of a higher content of GGBS is more beneficial in comparison to the use of fly ash in the mix due to the lower mixing time required to achieve homogeneity in the mixing process. It was found that the amount of energy required for mixing is directly related to the mixing time for the mix to achieve homogeneity.

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Fresh and mechanical properties of low-cement mortars for 3D printing

Cited by 14 publications

References 36 publications

3D Construction Printing Standing for Sustainability and Circularity: Material-Level Opportunities

3D Construction Printing Standing for Sustainability and Circularity: Material-Level Opportunities

Recent Trends in Advanced Radiation Shielding Concrete for Construction of Facilities: Materials and Properties

Effects of Admixtures on Energy Consumption in the Process of Ready-Mixed Concrete Mixing

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