Influence of aluminates on the hydration kinetics of tricalcium silicate

Pustovgar, Elizaveta; Mishra, Ratan K.; Palacios, Marta; Lacaillerie, Jean-Baptiste d’Espinose de; Matschei, Thomas; Andreev, A. F.; Heinz, Hendrik; Verel, René; Flatt, Robert J.

doi:10.1016/j.cemconres.2017.06.006

Cited by 155 publications

(149 citation statements)

References 50 publications

Supporting

Mentioning

128

Contrasting

Order By: Relevance

“…It is worth highlighting that corundum's influence on C 3 S hydration is similar to those of other aluminum‐rich compounds (eg, metakaolin, Al 2 O 3 nanoparticles, and soluble Al salts). Several prior studies have shown that aluminum‐rich compounds suppress C 3 S hydration rates at relatively early ages—resulting in prolonged induction period and delayed occurrence of the main hydration peak . On the basis of these studies, it is hypothesized that in [C 3 S + corundum] pastes, protraction of the induction period and delay in occurrence of the main hydration peak are, essentially, linked to the discharge of aluminate (Al(OH) 4 − ) ions from the dissolution of corundum.…”

Section: Resultsmentioning

confidence: 99%

“…The aluminate anions, once in the pore‐solution of the pastes, are able to adsorb onto C 3 S particulates and passivate the adsorbent's surfaces through the precipitation of metastable aluminosilicate complexes (comprising of aluminate anions, and Ca 2+ and OH ‐ ions that form an electrostatic double‐layer inclosing the C 3 S particulates’ surfaces). Such passivation, essentially, blocks dissolution sites (eg, kinks on etch pits of C 3 S surfaces) on C 3 S particulates’ surfaces, thus resulting in deceleration of C 3 S’s dissolution dynamics and prolongation of the induction period. Potential C‐S‐H nucleation sites on C 3 S particulates’ surfaces are also blocked because of the aforesaid surface passivation; this point is elaborated further in Section 4.2.…”

Section: Resultsmentioning

confidence: 99%

“…With time, as C 3 S progressively (and slowly) dissolves, the pH of (or concentration of OH ‐ ions in) the pore‐solution continues to rise. Once the pH rises to CH saturation level (ie, pH ≈ 12.68), the aluminosilicate complexes on C 3 S surfaces are rendered thermodynamically unstable . At (and beyond) this point, the aluminate anions detach from C 3 S particulates’ surfaces, and stabilize in the solution.…”

Section: Resultsmentioning

confidence: 99%

“…Notwithstanding, the filler effect of TiO 2 , in any form, has yet to be compared with other fillers in pure cementitious systems. Though corundum has not been extensively studied in the literature, additions of other Al‐rich compounds (eg, metakaolin, Al 2 O 3 nanoparticles, Al 2 O 3 ‐doped alite, and soluble Al salts) in pure cementitious systems have been explored . Majority of these studies have reported that dissolution of the Al‐based compound releases aluminate anions (Al(OH) 4 ¯ ) into the contacting solution, which, ultimately, results in extension of the induction period—a manifestation of suppression of early‐age hydration of the cementitious material.…”

Section: Introductionmentioning

confidence: 99%

“…Pustovgar et al utilized molecular dynamic simulations to show that the adsorption of aluminate anions onto C 3 S’s surfaces is energetically favorable due to ionic and hydrogen bonds forming between the aluminate anions and ionic species (ie, Ca 2+ , OH ¯ , and H 2 SiO 4 2− /H 3 SiO 4 − ions) surrounding C 3 S particulates. In addition to the original study, a pair of recent studies have reported that such adsorption of aluminate anions results in formation of metastable aluminosilicate complexes, which inhibit C 3 S dissolution sites (eg, kink sites found on etch pits) as well as potential sites for C‐S‐H nucleation on C 3 S particulates’ surfaces. This results in suppression of C 3 S hydration at early ages, which, typically, manifests as prolonged induction period.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Influence of size‐classified and slightly soluble mineral additives on hydration of tricalcium silicate

Cook

Kumar

2019

J Am Ceram Soc

View full text Add to dashboard Cite

Early-age hydration of cement is enhanced by slightly soluble mineral additives (ie, fillers, such as quartz and limestone). However, few studies have attempted to systematically compare the effects of different fillers on cementitious hydration rates, and none have quantified such effects using fillers with comparable, size-classified particle size distributions (PSDs). This study examines the influence of size-classified fillers [ie, limestone (CaCO 3 ), quartz (SiO 2 ), corundum (Al 2 O 3 ), and rutile (TiO 2 )] on early-age hydration kinetics of tricalcium silicate (C 3 S) using a combination of experimental methods, while also employing a modified phase boundary and nucleation and growth model. In prior studies, wherein fillers with broad PSDs were used, it has been reported that between quartz and limestone, the latter is a superior filler due to its ability to partake in anion-exchange reactions with C-S-H. Contrary to prior investigations, this study shows that when size-classified and area matched fillers are used-which, essentially, eliminate degrees of freedom associated with surface area and agglomeration of filler particulates-the filler effect of quartz is broadly similar to that of limestone as well as rutile. Results also show that unlike quartz, limestone, and rutile-which enhance C 3 S hydration kinetics-corundum suppresses hydration of C 3 S during the first several hours after mixing. Such deceleration in C 3 S hydration kinetics is attributed to the adsorption of aluminate anions-released from corundum's dissolution-onto anhydrous particulates' surfaces, which impedes both the dissolution of C 3 S and heterogeneous nucleation of C-S-H. K E Y W O R D Scement hydration, corundum, filler, limestone, nucleation and growth, rutile

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of size‐classified and slightly soluble mineral additives on hydration of tricalcium silicate

Cook

Kumar

2019

J Am Ceram Soc

View full text Add to dashboard Cite

show abstract

Polyacrylonitrile Interactions with Carbon Nanotubes in Solution: Conformations and Binding as a Function of Solvent, Temperature, and Concentration

Pramanik

Jamil

Gissinger

et al. 2019

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Polyacrylonitrile (PAN) is among the most promising precursor polymers to produce strong and lightweight carbon fiber. Conformations in solution and the extent of binding to carbon nanotubes (CNTs) are critical during gel spinning and for alignment of graphitic layers upon carbonization. First quantitative insights into these processes are reported using molecular dynamics simulations from the atomic scale including virtual π electrons and comparisons to experimental data. Common solvents for fiber spinning induce significant differences in PAN conformations in dilute solution at 25 C with persistence lengths between 0.5 and 2 nm.Variations in conformation become smaller at 75 C, in the presence of CNTs, and at higher PAN concentration. "Aging" of PAN conformations in dimethylformamide and dimethylsulfoxide at higher temperature is explained and a correlation between extended polymer conformations and increased binding to CNTs identified in dilute solutions. PAN is overall barely attracted to CNTs under common solution conditions and enters significant surface contact only at higher concentration as solvent is physically removed. The impact of temperature is small, whereby binding increases at lower temperature. The results provide first guidance to control interactions of polymers with CNTs to induce distinct conformations and specific binding at the early stages of assembly.

show abstract

New perspectives on carbon reinforced concrete structures—Why new composites need new design strategies

Curbach,

Hegger,

Bielak

et al. 2024

Civil Engineering Design

Self Cite

View full text Add to dashboard Cite

In civil engineering, carbon is typically regarded as a modern material to serve as reinforcement in concrete structures. Compared to steel reinforcement, it features two substantial benefits: It is not sensitive to corrosion, and has an enormously increased tensile strength. In contrast, carbon reinforcement is sensitive to lateral pressure and lacks the property of strain hardening. As a first step of establishing carbon reinforced concrete as a new building composite material, carbon reinforcement has basically served to replace the state‐of‐the‐art steel reinforcement. This target led to pioneering findings with respect to determining the material properties of the composite and developing advanced individual components. However, barely substituting steel by carbon does not allow to fully utilise the carbon's benefits while its disadvantageous properties reveal the limits of this approach. Instead, novel design principles are required to meet the material's nature aiming at appropriately using its beneficial properties.Currently, new construction principles are being researched for high‐performance building material combinations such as textile and carbon reinforced concrete. This paper provides an overview of baselines in the preliminary stages of this research. The overview includes history, inspiration, concrete matrices, non‐metallic reinforcement, structural elements, modelling, production, tomography, and sustainability. The objective of the study is to provide a baseline for the envisaged development of principles for future construction: radically new concepts for the design, modelling, construction, manufacturing, and use of sustainable, resource‐efficient building elements made of mineral building materials with the aim of entirely benefiting from the materials’ potential.This article is protected by copyright. All rights reserved.

show abstract

Influence of aluminates on the hydration kinetics of tricalcium silicate

Cited by 155 publications

References 50 publications

Influence of size‐classified and slightly soluble mineral additives on hydration of tricalcium silicate

Influence of size‐classified and slightly soluble mineral additives on hydration of tricalcium silicate

Polyacrylonitrile Interactions with Carbon Nanotubes in Solution: Conformations and Binding as a Function of Solvent, Temperature, and Concentration

New perspectives on carbon reinforced concrete structures—Why new composites need new design strategies

Contact Info

Product

Resources

About