Effect of viscosity modifier admixture on Portland cement paste hydration and microstructure

Figueiredo, Stefan Chaves; Çopuroğlu, Oğuzhan; Schlangen, Erik

doi:10.1016/j.conbuildmat.2019.04.020

Cited by 49 publications

(15 citation statements)

References 44 publications

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“…Several factors might have contributed to the degradation in composites ductility, such as: mix-design modification to make these materials printable, casting, and mixing procedures. Two modifications, lower total volume of water and the use of HPMC, would generate stronger matrices due to lower capillary porosity as a consequence of the lower water/binder ratio, and the internal curing promoted by the release of arrested water in the HPMC molecules [60]. Moreover, further in this study, another important difference was also discovered and will be addressed to justify the loss in the overall composite's ductility.…”

Section: Four-point Bendingmentioning

confidence: 85%

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Mechanical Behavior of Printed Strain Hardening Cementitious Composites

et al. 2020

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Extrusion based additive manufacturing of cementitious materials has demonstrated strong potential to become widely used in the construction industry. However, the use of this technique in practice is conditioned by a feasible solution to implement reinforcement in such automated process. One of the most successful ductile materials in civil engineering, strain hardening cementitious composites (SHCC) have a high potential to be employed for three-dimensional printing. The match between the tailored brittle matrix and ductility of the fibres enables these composites to develop multiple cracks when loaded under tension. Using previously developed mixtures, this study investigates the physical and mechanical performance of printed SHCC. The anisotropic behavior of the materials is explored by means of mechanical tests in several directions and micro computed tomography tests. The results demonstrated a composite showing strain hardening behavior in two directions explained by the fibre orientation found in the printed elements. Moreover, the printing technique used also has guaranteed an enhanced bond in between the printed layers.

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Section: Four-point Bendingmentioning

confidence: 85%

“…This admixture is known to work as a water reservoir while the mixture is still in the fresh state. This property also contributes to the phenomenon known as internal curing of cementitious composites and has been investigated before [60].…”

Section: Loading Perpendicular To the Printing Direction (Lpe)mentioning

confidence: 99%

Mechanical Behavior of Printed Strain Hardening Cementitious Composites

et al. 2020

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“…Frequently, also hydroxypropyl methylcellulose (HPMC) is used as VMA, which is reported to influence the hydration process and microstructure of cementitious matrices, seen in an increase of portlandite and void formation (Chaves Figueiredo et al 2019a). For limestone calcined clay cement (LC 3 )-based matrices 0.24 wt% HPMC and 2 wt% superplasticizer were found for achieving good shape stability, buildability, and green strength by relatively small extrusion pressures (Chen et al 2019(Chen et al , 2020b.…”

Section: Polymeric Admixtures In 3d Printable Cementitious Matricesmentioning

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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“…The differences in the properties observed for hardened specimens may originate from the mixing characteristics of the fresh concrete, such as the dissolution time from the VMA or superplasticizer, the fibre dispersion, and the entrapment of air during mixing. Previous work has indeed demonstrated how VMA can influence the total air void content of the cement paste [22]. Additionally, it is important to emphasize that the mixer in Eindhoven is significantly more powerful than the one in Delft, and that the mixing time in Eindhoven was adapted to reach the same visible consistency.…”

Section: Apparent Density and Air Void Contentmentioning

confidence: 97%

Quality Assessment of Printable Strain Hardening Cementitious Composites Manufactured in Two Different Printing Facilities

et al. 2020

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Over the past few years, several studies have shown the potential of three-dimensional concrete printing (3DCP) for applications in building and civil engineering. However, only a few studies have compared the properties of the fresh printing material and the quality of the printed elements from different printing facilities. Variations in the manufacturing conditions caused by the mixing procedures, the pumping device and the nozzle shape and/or dimensions may influence the quality of the printed elements. This study investigates the differences in the fresh and hardened properties of a printing material tested in two different printing facilities. The pump pressure and temperature experienced by the printing material during the printing session are monitored real-time. Hardened properties are measured for the printed elements, such as the bending capacity, the apparent density, and the air void content. The research shows that two different printing facilities may result in printed elements with relative differences in flexural strength and volumetric density of 49% and 7%, respectively.

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Effect of viscosity modifier admixture on Portland cement paste hydration and microstructure

Cited by 49 publications

References 44 publications

Mechanical Behavior of Printed Strain Hardening Cementitious Composites

Mechanical Behavior of Printed Strain Hardening Cementitious Composites

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

Quality Assessment of Printable Strain Hardening Cementitious Composites Manufactured in Two Different Printing Facilities

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