Effect of water–powder ratio on shear thickening response of SCC

Li, Huajian; Huang, Fali; Xie, Yongjiang; Yi, Zhihua; Wang, Zhen

doi:10.1016/j.conbuildmat.2016.11.061

Cited by 30 publications

(9 citation statements)

References 17 publications

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“…This is probably due to the high quantities of water adsorbed onto PE‐EVA‐PCM compared to the sand it replaces 18 . The viscosities of suspensions increase when the solid content becomes higher 51,52,53,54 . Accordingly, effectively removing some of the water by adsorption onto the particles causes the viscosity to rise.…”

Section: Resultsmentioning

confidence: 99%

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The effect of microencapsulated phase change materials on the rheology of geopolymer and Portland cement mortars

et al. 2020

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The effect of microencapsulated phase‐change materials (MPCM) on the rheological properties of pre‐set geopolymer and Portland cement mortars was examined. Microcapsules with hydrophilic and hydrophobic shells were compared. The shear rate dependency of the viscosities fitted well to a double Carreau model. The zero shear viscosities are higher for geopolymer mortar, illustrating poorer workability. The time evolution of the viscosities was explored at shear rates of 1 and 10 s−1. New empirical equations were developed to quantify the time‐dependent viscosity changes. The highest shear rate disrupted the buildup of the mortar structures much more than the lower shear rate. Microcapsules with a hydrophobic shell affect the rheological properties much less than the microcapsules with a hydrophilic shell, due to the higher water adsorption onto the hydrophilic microcapsules. Shear forces was found to break down the initial structures within geopolymer mortars more easily than for Portland cement mortars, while the geopolymer reaction products are able to withstand shear forces better than Portland cement hydration products. Initially, the viscosity of geopolymer mortars increases relatively slowly during due to formation of geopolymer precursors; at longer times, there is a steeper viscosity rise caused by the development of a 3D‐geopolymer network. Disruption of agglomerates causes the viscosities of portland cement mortars to decrease during the first few minutes, after which the hydration process (increasing viscosities) competes with shear‐induced disruption of the structures (decreasing viscosities), resulting in a complex viscosity behavior.

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Section: Resultsmentioning

confidence: 99%

“…18 The viscosities of suspensions increase when the solid content becomes higher. 51,52,53,54 (4a) Accordingly, effectively removing some of the water by adsorption onto the particles causes the viscosity to rise. St-DVB-PCM is very hydrophobic and adsorbs much less water than PE-EVA-PCM.…”

Section: Analysis Of Time-dependent Viscositiesmentioning

confidence: 99%

The effect of microencapsulated phase change materials on the rheology of geopolymer and Portland cement mortars

et al. 2020

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“…The rheological properties depend on many factors such as: the packing density, the specific surface area, water content, and film thicknesses [17][18][19][20][21]. Other studies show that the main factors influencing the rheology are the water-to-powder ratio and the superplasticizer dosage [22,23]. Despite previous studies investigate if those parameters influence individually or jointly the rheology of cementitious paste, it is still difficult to tell [24].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of using marine sediments in SCC pastes as supplementary cementitious materials

et al. 2019

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In the context of the depletion of natural geomaterials, the increasing amount of dredged sediments calls for seeking new possibilities for treating and recycling these materials as cementitious supplementary materials. The aim of this paper is to design ecological SCC pastes, which require less cement, incorporating treated marine sediments. Despite many approaches investigating the ultimate formula of self-compacting concrete (SCC), the process remains complex because it is based on many variables and components. According to the mix design method, twenty pastes were prepared with cement, superplasticizer, water, and treated marine sediments from the Dunkirk harbour (France). The pastes' fresh properties were determined by using the mini-slump cone (workability), and the Marsh cone (fluidity). Rheological properties were determined with a robust rheometer based on the Bingham model. Cohesiveness and compressive strength were tested as well. All responses were connected using ternary diagrams, which led to the definition of an optimal formula. Experimental checking was performed to validate the obtained results.

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“… A comparison of rheographs of 3D-printable concrete and self-compacting concrete (SCC) [ 44 , 54 , 58 , 60 , 61 , 62 , 67 , 68 , 69 , 70 , 71 , 72 ]. …”

Section: Figurementioning

confidence: 99%

3D Concrete Printing: A Systematic Review of Rheology, Mix Designs, Mechanical, Microstructural, and Durability Characteristics

2021

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This paper provides a state-of-the-art report on the up-to-date research on the emerging 3D concrete printing technology from the concrete materials perspective. It reviews the recent research focused on understanding and characterizing the rheological necessities of the concrete printing process and discusses how the researchers are tailoring compatible mix proportions for the 3D concrete printing process by using eco-friendly binders, waste aggregates, chemical admixtures, and nano-additives. This paper systematically evaluates anisotropic behavior in the mechanical properties of printed concrete and establishes an order for anisotropic behavior in the compressive, flexural, and tensile strengths along three different axes (X, Y, and Z axes) of printed concrete. It evaluates the ratio of flexural strength to the compressive strength of printed concrete along the above three axes. This article explains the influence of variation of printing process parameters on the mechanical properties and discusses reinforcement approaches used for increasing structural performance. The microstructure at the interface of adjacent layers and also at the interface of the reinforcement-cement matrix is discussed. The recent research on the durability performance of printed concrete is critically discussed and future research needs for 3D concrete printing are identified in this paper.

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Effect of water–powder ratio on shear thickening response of SCC

Cited by 30 publications

References 17 publications

The effect of microencapsulated phase change materials on the rheology of geopolymer and Portland cement mortars

The effect of microencapsulated phase change materials on the rheology of geopolymer and Portland cement mortars

Feasibility of using marine sediments in SCC pastes as supplementary cementitious materials

3D Concrete Printing: A Systematic Review of Rheology, Mix Designs, Mechanical, Microstructural, and Durability Characteristics

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