The influence of nano-additives in strengthening mechanical performance of 3D printed multi-binder geopolymer composites

Chougan, Mehdi; Ghaffar, Seyed Hamidreza; Jahanzat, Mohammad; Albar, Abdulrahman; Mujaddedi, Nahzatullah; Swash, Mohammad Rafiq

doi:10.1016/j.conbuildmat.2020.118928

Cited by 133 publications

(98 citation statements)

References 56 publications

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“…Figure 14b shows the internal section of P-G50/50 printed slab, where it is possible to observe the uniform dispersion of tire rubber aggregates. Besides, the application of high pressure during the extrusion process ensures greater compaction and densification of the 3D printed parts compared to their casted counterpart [61], with consequent improvement in mechanical performance, as also confirmed by the comparative data in Table 5.…”

Section: Sample Manufacturing Methods and Materials Homogeneitymentioning

confidence: 55%

Multi-Physics Analysis for Rubber-Cement Applications in Building and Architectural Fields: A Preliminary Analysis

et al. 2020

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Generally, in most countries, there are no strict regulations regarding tire disposal. Hence, tires end up thrown in seas and lands as well as being burnt, harming the living beings, and are therefore considered a very dangerous pollution source for the environment. Over the past few years, several researchers have worked on incorporating shredded/powdered rubber tires into cement-based material. This strategy shows a dual functionality: Economic–environmental benefits and technological functionalization of the building material. Rubber-modified cement materials show interesting engineering and architectural properties due to the physical-chemical nature of the tire rubber aggregates. However, the abovementioned performances are affected by type, size, and content of polymer particles used in the cement-based mixtures production. Whereas an increase in the rubber content in the cement mix will negatively affect the mechanical properties of the material as a decrease in its compression strength. This aspect is crucial for the use of the material in building applications, where proper structural integrity must be guaranteed. In this context, the development of innovative manufacturing technologies and the use of multi-physics simulation software represent useful approaches for the study of shapes and geometries designed to maximize the technological properties of the material. After an overview on the performances of 3D printable rubber-cement mixtures developed in our research laboratory, a preliminary experimental Finite Element Method (FEM) analysis will be described. The modeling work aims to highlight how the topology optimization allows maximizing of the physical-mechanical performances of a standard rubber-cement component for building-architectural applications.

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Section: Sample Manufacturing Methods and Materials Homogeneitymentioning

confidence: 55%

Multi-Physics Analysis for Rubber-Cement Applications in Building and Architectural Fields: A Preliminary Analysis

et al. 2020

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“…96%) and plastic viscosity (i.e. 56%), were exhibited for those composites loaded with 1.0% nano-graphite (Chougan et al 2020a). Aligned with the findings above, Zhong et al (2017) also reported that shear-thickening behaviour is needed to print geopolymer inks.…”

Section: Silicon-based Graphene-based and Clay Nanoparticles: Fresh Propertiesmentioning

confidence: 91%

“…During the 3D printing process, it is desirable to have a cohesive mixture that demonstrates sufficient rheology values to obtain a stable structure with minimum deformation while maintaining its extrusion performance. Chougan et al (2020a) investigated the effects of different volume fractions of nano-graphite particles (i.e. 0.1-1.0% by the weight of binder) on the multi-binder [i.e.…”

Section: Silicon-based Graphene-based and Clay Nanoparticles: Fresh Propertiesmentioning

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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“…Among these three mechanisms, the initial adhesion occurs due to both physical and micro-anchoring, which consists in the creation of microstructural adhesion points between the mortar and the substrate, either ceramic or concrete. Due to the mortar high water absorption, ettringite crystals are formed, in the case of cementitious mortars [ 29 , 32 ], or N-A-S-H (sodium aluminosilicate hydrated) and C-A-S-H gels in the case of activated alkali mortars [ 33 , 35 , 36 ]. However, if the mortar shows high water retention, even if the substrate has high absorption values, there is a difficulty in the migration of water from the mortar to the substrate, impairing micro-anchoring and consequently the initial adhesion between the materials.…”

Section: Introductionmentioning

confidence: 99%

Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

100

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The fresh and rheological properties of alkali mortars activated by blast furnace slag (BFS) were investigated. Consistency tests, squeeze flow, dropping ball, mass density in the hardened state, incorporated air, and water retention were performed. Mortars were produced with the ratio 1:2:0.45 (binder:sand:water), using not only ordinary Portland cement for control but also BFS, varying the sodium content of the activated alkali mortars from 2.5 to 15%. The results obtained permitted understanding that mortars containing 2.5 to 7.5% sodium present a rheological behavior similar to cementitious mortars by the Bingham model. In turn, the activated alkali mortars containing 10 to 15% sodium showed a very significant change in the properties of dynamic viscosity, which is associated with a change in the type of model, starting to behave similar to the Herschel–Bulkley model. Evaluating the properties of incorporated air and water retention, it appears that mortars containing 12.5% and 15% sodium do not have compatible properties, which is related to the occupation of sodium ions in the interstices of the material. Thus, it is concluded that the techniques used were consistent in the rheological characterization of activated alkali mortars.

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The influence of nano-additives in strengthening mechanical performance of 3D printed multi-binder geopolymer composites

Cited by 133 publications

References 56 publications

Multi-Physics Analysis for Rubber-Cement Applications in Building and Architectural Fields: A Preliminary Analysis

Multi-Physics Analysis for Rubber-Cement Applications in Building and Architectural Fields: A Preliminary Analysis

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

Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag

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