Some insights on the mechanism of saccharide set retardation of portland cement

Previte, Robert W.; Co, Woody

doi:10.1016/0008-8846(71)90005-6

Cited by 32 publications

(14 citation statements)

References 12 publications

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“…For the aqueous gray oilwell solution examined here (water/cement mass ratio w/c = 0.40, hydration time ≤2 h), the pH was measured to be approximately 12.7 and contained soluble inorganic species that included calcium cations and oxyanions of aluminum, silicon, and iron, which form during partial dissolution of the solid cementitious components. 21 Some saccharides, including glucose, have been shown to degrade in alkaline solutions, forming a variety of different degradation products with compositions and structures that depend on their initial aqueous concentrations, solution pH, and temperature. 38−40 However, sucrose has been shown to be relatively stable under similar conditions.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Reactions and Surface Interactions of Saccharides in Cement Slurries

Smith

Roberts²,

Funkhouser

et al. 2012

Langmuir

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Glucose, maltodextrin, and sucrose exhibit significant differences in their alkaline reaction properties and interactions in aluminate/silicate cement slurries that result in diverse hydration behaviors of cements. Using 1D solutionand solid-state 13 C nuclear magnetic resonance (NMR), the structures of these closely related saccharides are identified in aqueous cement slurry solutions and as adsorbed on inorganic oxide cement surfaces during the early stages of hydration. Solid-state 1D 29 Si and 2D 27 Al{ 1 H} and 13 C{ 1 H} NMR techniques, including the use of very high magnetic fields (18.8 T), allow the characterization of the hydrating silicate and aluminate surfaces, where interactions with adsorbed organic species influence hydration. These measurements establish the molecular features of the different saccharides that account for their different adsorption behaviors in hydrating cements. Specifically, sucrose is stable in alkaline cement slurries and exhibits selective adsorption at hydrating silicate surfaces but not at aluminate surfaces in cements. In contrast, glucose degrades into linear saccharinic or other carboxylic acids that adsorb relatively weakly and nonselectively on nonhydrated and hydrated cement particle surfaces. Maltodextrin exhibits intermediate reaction and sorption properties because of its oligomeric glucosidic structure that yields linear carboxylic acids and stable ring-containing degradation products that are similar to those of the glucose degradation products and sucrose, respectively. Such different reaction and adsorption behaviors provide insight into the factors responsible for the large differences in the rates at which aluminate and silicate cement species hydrate in the presence of otherwise closely related saccharides. ■ INTRODUCTIONSaccharide reactions and interactions at hydrating inorganic oxide surfaces significantly influence diverse surface chemistry processes that include carbonate formation in marine organisms, biosynthesis at aluminosilicate surfaces, biofuel production over heterogeneous catalysts, corrosion inhibition, and cement hydration. 1−7 The competitive adsorption of organic molecules and water at heterogeneous inorganic oxide surfaces influences reaction mechanisms, kinetics, molecular compositions and structures, and macroscopic material properties. Importantly, saccharide molecules are commonly used to alter the hydration processes and material properties of cements, such as the calcium aluminates and silicates that are widely used in synthetic structural materials. 8 In particular, the hydration kinetics of hydraulic aluminate/ silicate-based cements are critical to concrete construction and oilwell cementing, in which organic additives are often used to slow (inhibit) hydration processes or alter the rheological properties of cement−water mixtures, commonly referred to as cement "slurries". Despite their enormous technological importance, much remains to be known about the physicochemical interactions of the inorganic silicate or alumi...

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Section: ■ Results and Discussionmentioning

confidence: 99%

Reactions and Surface Interactions of Saccharides in Cement Slurries

Smith

Roberts²,

Funkhouser

et al. 2012

Langmuir

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show abstract

“…Another aspect to consider is that sugar components, hemicellulose and lignin can contribute to the inhibition of cement hydration or delay the cement setting time [33,[118][119][120][121][122]; even Eucalyptus pulp fibres which contain up to 85 wt% cellulose can reduce cement hydration rate [123]. Acid compounds released from biomass can also reduce the setting time of cement matrix [9].…”

Section: Difficulties Arising When Using Biomass In Cement and Concrementioning

confidence: 99%

Treatments of plant biomass for cementitious building materials – A review

Vo¹,

Navard²

2016

Construction and Building Materials

114

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International audienceThe use of plant biomass for developing energy efficient and low cost construction materials is an emerging field in building construction and civil engineering. Although the biomass-based cement and concrete composites have several advantages, such as low densities, low amount of CO2 gas emission, good thermal and acoustic insulation, there are also disadvantages or open questions like the durability of biomass in alkaline cement matrix, the high absorption of water and the cement-biomass compatibility, all deteriorating concrete mechanical properties, which are already intrinsically low due to the low mechanical properties of biomass-based fillers. This review gives the necessary basis in plant structure and composition for understanding how and why many treatments tested on biomass for overcoming the above-mentioned difficulties are acting. This paper reviews research papers and patents on the treatments tested to improve the mechanical properties, durability and compatibility of biomass for its use as concrete fillers for building materials

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“…Many studies have already confirmed that the soluble sugar and sugar acid can cause prominent inhibition during the cement hydration stage (Monosi et al 1983;Previte et al 1971;Ma et al 2015). At the initial stage of hydration, the complex formation between Ca 2+ and organic molecules (e.g., sugar) will lead to a lower level of Ca 2+ in solution (Milsetone.…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

Effects of Two Types of Waste Wood Species on the Hydration Characteristic of Portland Cement

Dong

Song

et al. 2016

ACT

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Despite much work on wood-cement composites, effects of wood species on the hydration of cements remain unclear until now. Thus, we herein investigated systematically effects of two typical wood species wastes on the hydration of Portland cement in this work. It was found that adding the poplar flour prominently affects the formation of the calcium silicate hydrate gel (C-S-H gel) delaying the hydration process, while the Chinese fir flour hardly retards the process due to different components. Compared with the neat cement, addition of both wood flours makes it easier to generate the ettringite. Besides, another important hydration product, calcium hydroxide Ca(OH) 2 , requires much longer time to form in the presence of both wood flours during hydration relative to the neat cement, e.g. nearly double time for the poplar-filled cement system. The findings provide useful information for extending the potential application of wood flours waste in cement composites.

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Some insights on the mechanism of saccharide set retardation of portland cement

Cited by 32 publications

References 12 publications

Reactions and Surface Interactions of Saccharides in Cement Slurries

Reactions and Surface Interactions of Saccharides in Cement Slurries

Treatments of plant biomass for cementitious building materials – A review

Effects of Two Types of Waste Wood Species on the Hydration Characteristic of Portland Cement

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