Influence of non-adsorbing polymers on drying of fresh mortars

Keita, Emmanuel; Rifaai, Yasser; Belin, Patrick; Roussel, Nicolas

doi:10.1016/j.cemconres.2018.10.016

Cited by 13 publications

(5 citation statements)

References 34 publications

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“…Furthermore, capillary pressure build-up is influenced by the rise of pore water to the surface as bleeding which emanates from plastic settlement that is influenced by yield stress and structuration. Only very few studies have given rheo-related description of these processes [11,12]. The interconnectivity of these plastic cracking process (settlement, shrinkage, and capillary pressure) suggests that they are linkable to the rheo-physical parameters, this was statistically explored.…”

Section: Rheo-physical Influencementioning

confidence: 99%

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Understanding the role of rheology in the plastic settlement and shrinkage cracking of early age concrete

2022

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Understanding the plastic (settlement/shrinkage) cracking phenomena of early-age concrete is important in-order to establish a holistic approach to minimise its occurrence. One of the factors associated with early-age concrete is the rheo-related behaviour which occur simultaneously within the timeframe known for plastic cracking. It is therefore useful to establish their links to broaden the knowledge of plastic cracking. This study is a novel evaluation of the influence of rheo-physical and rheo-viscoelastic behaviour on the plastic cracking behaviour by systematically altering these behaviours of formulated concrete mixes and extensively characterising them. The theory and frameworks for linking the behaviours were presented and established via statistical and analytical approaches. Significant rheo-related parameters found to influence plastic cracking phenomena include yield stress, structuration, creep and stress relaxation. The rheo-mechanics modelling suggests that the plastic cracking initiation tends to be a ductile failure that is pressure insensitive and sufficiently represented by von Mises criteria. This study opens up a consciousness to start evaluating mitigation strategies directed towards the materials optimisation of concrete mixtures to minimise the occurrence of plastic cracking in early-age concrete.

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Section: Rheo-physical Influencementioning

confidence: 99%

“…The source, timeframe, extent, magnitude, and links of such interactions are nearly non-existent in the literature. Only few studies [11,12] have endeavoured to elucidate the plastic cracking processes with rheo-related microscopic phenomena.…”

Section: Introductionmentioning

confidence: 99%

Understanding the role of rheology in the plastic settlement and shrinkage cracking of early age concrete

2022

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“…the slope of the curve changes as it can be seen at aprox. 30 min for plaster and approx.150 min for cement, [75]. At early age, the mass loss increases with the initial mass.…”

Section: Water Evaporationmentioning

confidence: 93%

Material-process interactions in particle bed 3D printing and the underlying physics

Lowke¹,

Mai²,

Keita³

et al. 2022

Cement and Concrete Research

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“…Water was allowed to evaporate only from the top surface. The samples were kept in a drying tunnel (cross section: 50 cm × 70 cm) where dried air was blown at a constant flow rate of 60 L/min [ 45 , 46 ]. The room temperature was kept at

°C.…”

Section: Methodsmentioning

confidence: 99%

Particle Deposition in Drying Porous Media

Keita

2021

Materials

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The drying of porous media is a ubiquitous phenomenon in soils and building materials. The fluid often contains suspended particles. Particle deposition may modify significantly the final material, as it could be pollutants or clogging the pores, decreasing the porosity, such as in salt, in which particles and drying kinetics are coupled. Here, we used SEM and X-ray microtomography to investigate the dried porous media initially saturated by nanoparticle suspensions. As the suspensions were dried, nanoparticles formed a solid deposit, which added to the initial solid matrix and decreased the porosity. We demonstrate that since the drying occurred through the top surface, the deposit is not uniform as a function of depth. Indeed, the particles were advected by the liquid flow toward the evaporative surface; the deposit was significant over a depth that depended on the initial volume fraction, but the pore size was affected over a very narrow length. These findings were interpreted in the frame of a physical model. This study may help to design better porous media and take into account particle influence in drying processes.

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Influence of non-adsorbing polymers on drying of fresh mortars

Cited by 13 publications

References 34 publications

Understanding the role of rheology in the plastic settlement and shrinkage cracking of early age concrete

Understanding the role of rheology in the plastic settlement and shrinkage cracking of early age concrete

Material-process interactions in particle bed 3D printing and the underlying physics

Particle Deposition in Drying Porous Media

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