Mix suitable for concrete 3D printing: A review

Khan, M.A.

doi:10.1016/j.matpr.2020.03.825

Cited by 47 publications

(23 citation statements)

References 36 publications

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“…Pumpability can be defined as the capacity of a concrete specimen to be mobilized under pressure meanwhile maintaining the initial properties (Jolin et al 2009). The pumpability index is generally tested through the classical slump test and slump flow test (Khan 2020). In other studies, pumpability has been quantified through tribometer testing, a sliding pipe rheometer, and a viscometer (Mechtcherine et al 2014;Secrieru et al 2017).…”

Section: Fresh Properties Of 3d Printable Mixturesmentioning

confidence: 99%

The effects of nano- and micro-sized additives on 3D printable cementitious and alkali-activated composites: a review

et al. 2021

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Additive manufacturing (AM), also referred as 3D printing, is a technology that enables building automated three-dimensional objects in a layer-by-layer manner. AM of cement-based and alkali-activated composites has gathered attention over the last decade and is one of the most rapidly developing civil engineering fields. Development of proper mixture compositions which are suitable in fresh and hardened state is one of the key challenges of AM technology in construction. As the behaviour of cement-based materials (CBM) and alkali-activated materials (AAM) is determined by chemical and physical processes at the nano-level, incorporation of nano- and micro-sized admixtures has great influence on the performance of printable composites. These modifications are attributed to the unique reactivity of nanoparticles associated with their small size and large surface area. This review paper summarizes recent developments in the application of nano- and micro-particles on 3D printable cementitious composites and how they influence the performance of 3D-printed construction materials. The research progress on nano-engineered CBM and AAM is reviewed from the view of fresh and hardened properties. Moreover, comparison between nano- and micro-sized admixtures including nanosilica, graphene-based materials, and clay nanoparticles as well as chemical admixtures such as viscosity-modifying admixtures and superplasticizers is presented. Finally, the existing problems in current research and future perspectives are summarized. This review provides useful recommendations toward the significant influence of nano- and micro-sized admixtures on the performance of 3D printable CBMs.

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Section: Fresh Properties Of 3d Printable Mixturesmentioning

confidence: 99%

The effects of nano- and micro-sized additives on 3D printable cementitious and alkali-activated composites: a review

et al. 2021

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“…It has been reported that researchers typically use nanofillers and viscosity modifiers to provide the rheological requirements required for 3DPC (Panda et al, 2019). It is well known that in 3DPC mixes (Khan, 2020), the printability is improved by using a large amount of cement, which results in higher heat for its hydration of cement (Snelson et al, 2008), leading to drying shrinkage and blocked nozzles. When the amount of cement is lower, the setting time of 3DPC is longer, the early strength is low, and the printability is low.…”

Section: D Printing Concretementioning

confidence: 99%

Developments and Applications of Carbon Nanotube Reinforced Cement-Based Composites as Functional Building Materials

et al. 2022

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Carbon nanotube (CNT) is a promising nanomaterial with excellent mechanical, electrical, thermal, and chemical stability. It has received extensive attention due to its unique multifunctional properties in engineering materials. Researchers have explored the preparation and characterization of CNT reinforced cement-based materials. Studies have shown that adding CNT will significantly improve the performance of cement-based materials. This article introduces the techniques for the dispersion characterization of CNT and summarizes the advantages and disadvantages of these techniques. The functionalized applications of CNT in cement-based materials are reviewed, including sensing performance, structural health monitoring of concrete, electromagnetic shielding, and other applications. In addition, the application and development prospects of CNT in 3D printing concrete have been prospected. Finally, we discussed the existing problems and challenges in developing and applying CNT in cement-based materials and suggested future research.

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“…Pumpability is characterized as a mixture’s ability to be mobilized under pressure while preserving its original properties [ 220 ]. The typical slump test and the slump flow test are commonly used to determine the pumpability index [ 221 ]. Pumpability has been measured using a tribometer, a sliding pipe rheometer, and a viscometer in other tests [ 222 , 223 ].…”

Section: 3d Printing Of Cementitious Compositesmentioning

confidence: 99%

An Overview on the Rheology, Mechanical Properties, Durability, 3D Printing, and Microstructural Performance of Nanomaterials in Cementitious Composites

Song

Xin-le

2021

Materials

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The most active research area is nanotechnology in cementitious composites, which has a wide range of applications and has achieved popularity over the last three decades. Nanoparticles (NPs) have emerged as possible materials to be used in the field of civil engineering. Previous research has concentrated on evaluating the effect of different NPs in cementitious materials to alter material characteristics. In order to provide a broad understanding of how nanomaterials (NMs) can be used, this paper critically evaluates previous research on the influence of rheology, mechanical properties, durability, 3D printing, and microstructural performance on cementitious materials. The flow properties of fresh cementitious composites can be measured using rheology and slump. Mechanical properties such as compressive, flexural, and split tensile strength reveal hardened properties. The necessary tests for determining a NM’s durability in concrete are shrinkage, pore structure and porosity, and permeability. The advent of modern 3D printing technologies is suitable for structural printing, such as contour crafting and binder jetting. Three-dimensional (3D) printing has opened up new avenues for the building and construction industry to become more digital. Regardless of the material science, a range of problems must be tackled, including developing smart cementitious composites suitable for 3D structural printing. According to the scanning electron microscopy results, the addition of NMs to cementitious materials results in a denser and improved microstructure with more hydration products. This paper provides valuable information and details about the rheology, mechanical properties, durability, 3D printing, and microstructural performance of cementitious materials with NMs and encourages further research.

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Mix suitable for concrete 3D printing: A review

Cited by 47 publications

References 36 publications

The effects of nano- and micro-sized additives on 3D printable cementitious and alkali-activated composites: a review

The effects of nano- and micro-sized additives on 3D printable cementitious and alkali-activated composites: a review

Developments and Applications of Carbon Nanotube Reinforced Cement-Based Composites as Functional Building Materials

An Overview on the Rheology, Mechanical Properties, Durability, 3D Printing, and Microstructural Performance of Nanomaterials in Cementitious Composites

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