Polycarboxylate-based water reducing admixture – clay compatibility; literature review

Şahin, Hatice Gizem; Biricik, Öznur; Mardani‐Aghabaglou, Ali

doi:10.1007/s10965-021-02884-5

Cited by 23 publications

(10 citation statements)

References 84 publications

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“…The electrostatic effect occurs when the carboxylate groups of the HRWRA adhere to the cement surface. (Karakuzu et al, 2021;Ozen et al, 2020a;Yigit et al, 2020;Sahin et al, 2022c;Kalipcilar et al, 2016;Latifi et al, 2022;Sahin et al, 2020). At the same time, polyethylene oxide side chains provide steric hindrance (Altun et al, 2021;Ozen et al, 2021;Sahin & Mardani., 2022d;Mardani-Aghabaglou, 2021a;Ozen et al, 2020b;Ozen et al, 2022b;Mardani-Aghabaglou, 2021b).…”

Section: Resultsmentioning

confidence: 99%

Investigation of High Range Water-Reducing Admixture Requirement in Cementitious Systems Containing Fly Ash with Different Utilization Ratio and Fineness

SAHIN¹,

BIRICIK²,

Mardani‐Aghabaglou³

2022

EPSTEM

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Section: Resultsmentioning

confidence: 99%

Investigation of High Range Water-Reducing Admixture Requirement in Cementitious Systems Containing Fly Ash with Different Utilization Ratio and Fineness

SAHIN¹,

BIRICIK²,

Mardani‐Aghabaglou³

2022

EPSTEM

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“…Damages due to freeze-thaw effects are common in countries where the air temperature drops below zero. [114][115][116][117][118][119][120][121] The freeze-thaw resistance of 3DPC mixtures should be investigated and developed in order to make their use widespread, especially in cold regions. It is clear that the freeze-thaw resistance of 3DPC specimens and the methods that can be used to increase this resistance are different from conventional concretes.…”

Section: Freeze-thaw Resistancementioning

confidence: 99%

Mechanical properties, durability performance and interlayer adhesion of 3DPC mixtures: A state‐of‐the‐art review

Şahin

Mardani‐Aghabaglou

2023

Structural Concrete

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In this study, the strength and durability performance of 3D printing concrete mixtures (3DPC) were examined in terms of the materials used in their production and printing process parameters (interlayer interval time, printing speed, and nozzle shape). Due to the anisotropic nature of 3DPC, it was understood that the compressive strength depends on the loading direction. It was emphasized that it is necessary to control the shrinkage behavior of 3DPC mixtures due to the lack of formwork and the high dosage of binders. It was reported that the interlayer adhesion of 3DPC is highly dependent on the interlayer interval time and printing speed parameters. It was understood that nozzle shape and standoff distance affect the mechanical properties and surface roughness of 3DPC specimens, and this effect is more pronounced in mixtures with high static yield stress values.

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“…This phenomenon could be attributed to that the increased content of PCE dispersed the cementitious particles, which decreased the bridging bond between the cementitious material and the static yield stress of 3DPM. However, the addition of NAC provided thixotropic rigid bonding, forming a high thixotropic slurry system, which made up for the poor flocculation effect caused by the high amount of PCE [38,39]. It shows that NAC has good compatibility with PCE.…”

Section: Static Yield Stress and Apparent Viscositymentioning

confidence: 99%

“…When NAC is added, the printing layer number of 3DPM was improved greatly. This could be attributed to that (1) The adsorption of NAC to PCE weakens the dispersion ability of PCE in 3DPM [38]; (2) the water absorption capacity of NAC reduced the free water in fresh paste and improved the thixotropy of 3DPM, which makes the printing material have higher structural stability (the ability to keep its own shape unchanged) [52].…”

Section: D Concrete Printingmentioning

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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Polycarboxylate-based water reducing admixture – clay compatibility; literature review

Cited by 23 publications

References 84 publications

Investigation of High Range Water-Reducing Admixture Requirement in Cementitious Systems Containing Fly Ash with Different Utilization Ratio and Fineness

Investigation of High Range Water-Reducing Admixture Requirement in Cementitious Systems Containing Fly Ash with Different Utilization Ratio and Fineness

Mechanical properties, durability performance and interlayer adhesion of 3DPC mixtures: A state‐of‐the‐art review

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

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