Role of chemical admixtures on 3D printed Portland cement: Assessing rheology and buildability

Souza, Marcelo Tramontin; Ferreira, Isana Álvares; Moraes, Elisângela Guzi de; Senff, L.; Arcaro, Sabrina; Pessôa, José Renato Castro; Ribeiro, M.J.; Oliveira, Antônio Pedro Novaes de

doi:10.1016/j.conbuildmat.2021.125666

Cited by 35 publications

(15 citation statements)

References 63 publications

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“…Thus, the printing cannot start before it exhibits the minimum yield stress to support its weight, while it cannot be printed if the reaction proceeds and the yield stress exceeds 1 kPa. So far, various sophisticated approaches have been proposed to control the progress of hydration reactions and their yield stress [38][39][40][41][42][43] . For example, reaction kinetics can be well controlled using accelerators (consisting of calcium chloride and calcium nitrate-based hydrate) and retarders (made by sucrose, for example) 39,41,43) .…”

Section: Concrete For 3d Printing From a Rheological Perspectivementioning

confidence: 99%

“…So far, various sophisticated approaches have been proposed to control the progress of hydration reactions and their yield stress [38][39][40][41][42][43] . For example, reaction kinetics can be well controlled using accelerators (consisting of calcium chloride and calcium nitrate-based hydrate) and retarders (made by sucrose, for example) 39,41,43) . Yield stress can be artificially increased by bridging cement particles with high ing silica fume or nanoclays 40,42) .…”

Section: Concrete For 3d Printing From a Rheological Perspectivementioning

confidence: 99%

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Review of Rheology in Cement-Based Materials and Its Application to 3D Printing Using Concrete

Ishida

Nakada

2023

J. Soc. Rheol., Jpn

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This review briefly summarizes introductory understandings of concrete rheology and applications in which rheology plays an important role. A mixture of cement and water is the rheological material classified as dispersed systems involving chemical reactions, and it has been considered the most challenging research subject in the field of rheology. This review introduces the most crucial chemical admixture for fresh concrete controlling rheological properties (so-called superplasticizer) after summarizing the fundamental knowledge of concrete rheology. In addition, recent research trends on 3D printing using concrete, riddled with rheological challenges, are introduced.

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Section: Concrete For 3d Printing From a Rheological Perspectivementioning

confidence: 99%

Section: Concrete For 3d Printing From a Rheological Perspectivementioning

confidence: 99%

Review of Rheology in Cement-Based Materials and Its Application to 3D Printing Using Concrete

Ishida

Nakada

2023

J. Soc. Rheol., Jpn

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“…Qian et al [21] controlled the fluidity and structural build-up of cement paste in fresh state by adjusting the amount of PCE and water-cement ratio, but it cannot improve the structural build-up rate of concrete 3D printing. Marcelo et al [22] used the setting accelerators to increasethe structuration rate of cement paste to make up for the retarding and repulsive effect caused by the addition of superplasticizer. However, it is found a large number of setting accelerators are needed to achieve proper constructability, which is harmful to the long-term compressive strength of concrete 3D printing.…”

Section: Introductionmentioning

confidence: 99%

Effect of nano clay and PCE on the buildability of ultra-fine dredged sand-based 3D printing materials

Wang

Hua

Chen³

et al. 2023

Mater. Res. Express

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The use of ultra-fine dredged sand instead of natural sand in construction 3D printing materials can significantly reduce the cost. However, ultra-fine dredged sand has fine particles and high angular morphology, which can hinder the buildability and continuous printability of construction 3D printing materials. The addition of polycarboxylate superplasticizer (PCE) can effectively solve this problem. Considering that the change of PCE (content of 0, 0.1%, 0.2%, 0.3%) content has a great influence on the printing performance of mortar, in order to make up for this deficiency, nano clay (content of 0,1%) is added to the mortar. The experimental results showed that the addition of nano clay can significantly reduce the negative effects of PCE on the yield stress and apparent viscosity of 3D printing materials (3DPM). When the content of PCE is 0.2%, the addition of 1% NAC could increase the static yield stress and viscosity growth rate of 3DPM by 111.8% and 115.3% respectively. In addition, unconfined compressive strength test, isothermal calorimetry, mercury invasion porosity method and thermogravimetric analysis were used to characterize the hardening properties of 3DPM. The results of heat of hydration showed that the addition of nano clay reduced the hydration exothermic peak of 3DPM, but increased the total heat release. The results of pore structure analysis showed that the addition of nano clay reduced the macropore (>1000 nm) of 3DPM from 19.31% to 18.82%. Thermogravimetric analysis showed that the addition of nano clay increased the hydration products. Therefore, the compressive strength of 3DPM was kept within an acceptable range. Finally, the laboratory's printing results indicated that the 3DPM can print up to 20 layers continuously.

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“…21 The effects of chemical additives with various action mechanisms in various types of cement are extensively documented in the literature. 22 In 3DPC, it was found that various admixtures are used in various combinations to make it acceptable for 3D printing. However, little is known about achieving the ideal dosage and the chemical interactions when admixtures are utilized.…”

Section: Introductionmentioning

confidence: 99%

“…However, little is known about achieving the ideal dosage and the chemical interactions when admixtures are utilized. 22 On the other hand, using superplasticizer (SP) was shown to dramatically raise the price of concrete. However, fly ash can be used in place of cement to reduce the greater price of concrete brought on by the usage of SP.…”

Section: Introductionmentioning

confidence: 99%

3D printable concrete without chemical admixtures: Fresh and hardened properties

Ingle,

Kaliyavaradhan,

Ambily

et al. 2023

Structural Concrete

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There are several significant advantages to 3D concrete printing (3DCP) over conventional concreting techniques. Structures are built by printing them one layer at a time. This study aimed to improve the usability and accessibility of this technology to solve on‐site issues, such as those caused by chemical admixture. In order to construct concrete that can be printed in three dimensions, researchers added many chemical admixtures in controlled quantities. This experiment's main goals were to prepare 3D printable concrete (3DPC) without chemical admixture and to evaluate fresh and hardened properties. Slump, flow, extrudability, buildability, open time, and penetrometer tests were carried out for fresh properties. Compressive, flexural, splitting tensile strength, and modulus of elasticity were evaluated for hardened properties. The printed specimens in the longitudinal direction exhibited higher compressive strength than in the downward and lateral directions. Similarly, higher flexural and splitting tensile strength in the longitudinal direction of printed specimens than in the downward and lateral direction. The results of developing 3DPC without chemical admixtures demonstrated good performance in fresh and hardened properties.

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Role of chemical admixtures on 3D printed Portland cement: Assessing rheology and buildability

Cited by 35 publications

References 63 publications

Review of Rheology in Cement-Based Materials and Its Application to 3D Printing Using Concrete

Review of Rheology in Cement-Based Materials and Its Application to 3D Printing Using Concrete

Effect of nano clay and PCE on the buildability of ultra-fine dredged sand-based 3D printing materials

3D printable concrete without chemical admixtures: Fresh and hardened properties

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