Interactions of polysaccharide stabilising agents with early cement hydration without and in the presence of superplasticizers

Schmidt, Wolfram; Brouwers, Hjh Jos; Kühne, Hans‐Carsten; Meng, Birgit

doi:10.1016/j.conbuildmat.2016.11.022

Cited by 28 publications

(7 citation statements)

References 33 publications

(50 reference statements)

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“…These studies also examined the effects of additives and chemical treatments on the release of polysaccharides from plantbased materials, such as miscanthus stem fragments, in the presence of cement. These studies show that, in general, polysaccharides, regardless of their chemical base, increase the plastic viscosity, but their effect on the yield stress can vary [15,16]. The chemical modification of starch and cellulose leads to the reduction of their molecular weights and improves the dispersant effect of these compounds [17].…”

Section: Introductionmentioning

confidence: 94%

A New Experimental Setup to Characterize Binder–Vegetal Particle Compatibility in Plant-Based Concrete

Prud’Homme,

Delhomme,

Julliot

et al. 2024

Buildings

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The good insulation properties and the low carbon footprint of vegetal concretes make them promising materials whose use tends to grow continuously. To produce optimized building materials, a better understanding of the interfacial transition zone (ITZ) between vegetal particles and cement paste in terms of the reactions involved and the size of the impacted surface was investigated. This research led to the setting of a reliable visual test to observe ITZ, which enables the monitoring of its appearance and development. Different combinations of vegetal particles and cement pastes were tested to compare the formed ITZ: hemp, rapeseed, and bamboo into Portland and Prompt cement. Finally, a clear link was drawn between the sugar concentration and the size of ITZ. Thanks to image analysis, it was shown that ITZ is due to physico-chemical reactions, with the extraction of free saccharide molecules from the vegetal and water suction followed by their release into the cement paste.

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Section: Introductionmentioning

confidence: 94%

A New Experimental Setup to Characterize Binder–Vegetal Particle Compatibility in Plant-Based Concrete

Prud’Homme,

Delhomme,

Julliot

et al. 2024

Buildings

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“…Various researchers have shown that cassava peel ashes (CPA) qualify as SCM [7,12,13]. The starch of cassava contains about 80% amylopectin and 20% amylose, which is very similar to potato starch, which has already been used as concrete admixture [23][24][25] with plastifying and stiffening effect [8,[26][27][28].…”

Section: Cassava Starch As Stabilising Agent or Plasticisermentioning

confidence: 99%

“…However, it is important to note that the effect of starch in cementitious systems is complex and depends upon the modification of the starch as well [8,[29][30][31]. Due to the high versatility of potato starch, thus, the potentials of cassava starch for the chemical industry is also very promising.…”

Section: Cassava Starch As Stabilising Agent or Plasticisermentioning

confidence: 99%

“…Hence, agriculture is an immanently important economic driver in South America and Africa with large growth potential. It is therefore reasonable to take a closer look on possible uses of bio-based waste products as construction constituents in countries with large agricultural sector:  Polysaccharides can be excellent precursors for performance enhancing chemical admixtures, that can help reducing the cement in concrete and using cement more efficiently [7][8][9][10][11].  Various ashes of agricultural waste products exhibit pozzolanic or hydraulic properties, provided they are processed adequately.…”

Section: Introductionmentioning

confidence: 99%

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Plant based chemical admixtures – potentials and effects on the performance of cementitious materials

et al. 2019

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While today, engineers can choose from a wide range of rheology modifying admixtures, in some parts of the world, these are difficult to access, due to their complex processing. However, alternatives can be bio-based polymers such as polysaccharides from various sources. These are easily accessible all over the world, do not demand for complicated processing, and typically they are more sustainable than many established materials, which are crude oil-based. The paper presents the effects of acacia gum, cassava starch and the gum of triumfetta pendrata A. Rich on the rheological performance of cementitious systems. It is shown that acacia gum can be as efficient as polycarboxylate based superplasticisers, cassava starch can reduce the yield stress slightly with little effect on the plastic viscosity, and the gum of triumfetta pendrata A. Rich increases the thixotropy of cement pastes with plasticizing polymers significantly.

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“…C 3 S and C 2 S react with water to calcium silicate hydrate (C-S-H) and portlandite (Ca(OH) 2 ), which determines the stiffness and strength of concrete. The reaction of C 3 A with water significantly contributes to the workability and the slump life of fresh concrete [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Utilizing optical spectroscopy and 2′,7′-difluorofluorescein to characterize the early stages of cement hydration

Pauli

Ramirez

Crasselt

et al. 2021

Methods Appl. Fluoresc.

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The increasingly sophisticated nature of modern, more environmentally friendly cementitious binders requires a better understanding and control particularly of the complex, dynamic processes involved in the early phase of cement hydration. In-situ monitoring of properties of a constantly changing system over a defined period of time calls for simple, sensitive, fast, and preferably also non-invasive methods like optical spectroscopy. Here, we exploit the time-dependent changes in the absorbance and fluorescence features of the negatively charged optical probe 2′,7′-difluorofluorescein (DFFL) for the study of the hydration processes in pastes of white cement (WC), cubic tricalcium aluminate (C3A), and tricalcium silicate (C3S), the main phases of cement, and in pastes of quartz (Q) over 24 h after addition of the dye solution. For comparison, also conventional techniques like isothermal heat flow calorimetry were applied. Based upon the time-dependent changes in the spectroscopic properties of DFFL, that seem to originate mainly from dye aggregation and dye-surface interactions and considerably vary between the different pastes, molecular pictures of the hydration processes in the cement pastes are derived. Our results clearly demonstrate the potential of optical spectroscopy, i.e., diffuse reflectance, steady state and time-resolved fluorometry in conjunction with suitable optical reporters, to probe specific hydration processes and to contribute to a better understanding of the early hydration processes of cement at the molecular scale.

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Interactions of polysaccharide stabilising agents with early cement hydration without and in the presence of superplasticizers

Cited by 28 publications

References 33 publications

A New Experimental Setup to Characterize Binder–Vegetal Particle Compatibility in Plant-Based Concrete

A New Experimental Setup to Characterize Binder–Vegetal Particle Compatibility in Plant-Based Concrete

Plant based chemical admixtures – potentials and effects on the performance of cementitious materials

Utilizing optical spectroscopy and 2′,7′-difluorofluorescein to characterize the early stages of cement hydration

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