Impact of carboxylated styrene–butadiene copolymer on the hydration kinetics of OPC and OPC/CAC/AH: The effect of Ca2+ sequestration from pore solution

Baueregger, Stefan; Perello, Margarita; Plank, Johann

doi:10.1016/j.cemconres.2015.03.004

Cited by 26 publications

(13 citation statements)

References 19 publications

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“…Baueregger et al. showed that styrene‐butadiene latex increased the AFt formation kinetics by reducing Ca 2+ ions and increasing SO 4 2− ion concentration in the pore solution of PC‐rich CAC–PC–C$ system 160 . This finding is consistent with the work of Zhang et al.…”

Section: Effect Of Chemical Admixturesupporting

confidence: 86%

“…In the AFt‐accelerated system, the effect of polymer on the formation kinetics and crystal structure of AFt is distinct from that of pure PC system 160 . Polymer particles, particularly carboxylate (RCOO − ) groups, can form Ca‐polymer complexation, resulting in calcium ion depletion from the pore solution.…”

Section: Effect Of Chemical Admixturementioning

confidence: 99%

“…In the AFt-accelerated system, the effect of polymer on the formation kinetics and crystal structure of AFt is distinct from that of pure PC system. 160 Polymer particles, particularly carboxylate (RCOO − ) groups, can form Capolymer complexation, resulting in calcium ion depletion from the pore solution. As a consequence, the dissolution of anhydrite (C$), as well as the formation of ettringite, can be accelerated to compensate for the calcium ion deficit.…”

Section: Effect Of Polymersmentioning

confidence: 99%

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A critical review of the role of ettringite in binders composed of CAC–PC–C$ and CSA–PC–C$

2023

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Ettringite-accelerated binders composed of CAC-PC-C$ (calcium aluminate cement-Portland cement-calcium sulfate) and CSA-PC-C$ (calcium sulfoaluminate cement-Portland cement-calcium sulfate) have been used widely for indoor applications, such as self-leveling floor screeds, underlayment, and tile adhesives owing to their rapid setting, early strength gain, and shrinkage compensation properties. These properties also make these binders appealing candidates for outdoor rapid repair (e.g., highways, bridge decks, and airfield pavements). However, a central question remains: Does ettringite remain stable in outdoor exposure conditions? If so, which factors will contribute positively/negatively to the long-term stability of ettringite in these systems? To address these questions, this critical review presents the current state of knowledge regarding the hydration of ternary binders composed of CAC-PC-C$ and CSA-PC-C$ with respect to ettringite formation and the factors affecting the stability of ettringite thereafter. The purpose of this review paper is to synthesize and analyze current research regarding conditions that promote or deter ettringite stability, establish what information is missing, unclear, or contradictory, and identify remaining research needs to address the identified knowledge gaps.

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Section: Effect Of Chemical Admixturesupporting

confidence: 86%

Section: Effect Of Chemical Admixturementioning

confidence: 99%

Section: Effect Of Polymersmentioning

confidence: 99%

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A critical review of the role of ettringite in binders composed of CAC–PC–C$ and CSA–PC–C$

2023

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“…The adsorbed polymer layer will hinder the cement hydration by acting as a diffusion barrier layer to suppress the diffusion of water and ions between the mineral phase and aqueous phase [14,23], thus prolong the induction period and decrease the hydration rate [31]. Meanwhile, the addition of polymer dispersions in cementitious system could decrease the concentration of free Ca 2? in cement pore solution through complexation effect between polymers and Ca 2? , thus, the nucleation rate of calcium silicate hydrates (C-S-H) and the precipitation rate of Portlandite are retarded, and finally, the induction period can be prolonged [14,33]. Lu et al [14] found that the hydrolysis of ester groups in acrylate units in SA copolymer is significantly accelerated by elevated temperature in alkaline condition.…”

Section: Introductionmentioning

confidence: 99%

Rejuvenation, embryonic shear bands and improved tensile plasticity of metallic glasses by nanosecond laser shock wave

Yan

Zhang

et al. 2019

Journal of Non-Crystalline Solids

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The influence of three polymer dispersions [styrene-butadiene copolymer (SB), styrene-acrylic ester copolymer (SA) and polyacrylic ester (PA)] on the hydration of calcium sulfoaluminate (CSA) cement within 72 h was investigated by using isothermal conduction calorimetry, X-ray diffraction analysis and thermal gravimetric analysis. The results indicate that these three polymer dispersions perform different influences on the hydration heat flow of CSA cement during different periods, they all postpone the occurrence time of the maxima peaks, and its extent is mainly dependent on the addition amount. Polymer dispersions manifest great retardation on the initial hydration of CSA cement, and the effect is much more significant within 1 h. In this stage, the generation of ettringite is strongly delayed; however, the formation of ettringite is accelerated by these polymer dispersions at and after 2 h. Among these three polymer dispersions, PA demonstrates the highest acceleration effect on the hydration degree.

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“…The set behavior of cements such as ordinary Portland cement (OPC) or calcium aluminate cement (CAC) in the presence of various admixtures like superplasticizers, [1][2][3] latex polymers, 4,5 retarders, 6,7 or accelerators including nano C-S-H 8,9 or biopolymers, for example, alginate [10][11][12] has been investigated extensively. Most often, heat flow calorimetry in cement paste and mortar strength tests are applied to study the impact of admixtures on the hydration reaction of the binder.…”

Section: Introductionmentioning

confidence: 99%

Impact of sand and filler materials on the hydration behavior of calcium aluminate cement

Engbert

Plank

2020

J. Am. Ceram. Soc.

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In earlier work, we have observed discrepancies relating to the early hydration of calcium aluminate cement (CAC) when comparing data from heat flow calorimetry of CAC paste with results from mortar strength tests using the crushing method. Here, we investigated on this phenomenon and found that the sand which is used as a filler exerts a major influence on CAC hydration resulting in acceleration. Furthermore, in particular fine filler materials such as, for example, microsilica, fine limestone powder, and especially α-and γ-Al 2 O 3 also produced a strong hydration accelerating effect which is dependent on their specific surface area. The mechanism underlying the acceleration is that under alkaline conditions their negative surface charge attracts calcium ions as was confirmed via inductively coupled plasma atomic emission measurements. Such a layer generates favourable conditions for the nucleation of CAC hydration products (C-A-H phases). The resulting crystalline hydrates which form on the surface of the filler particles submerged in CAC cement pore solution were visualized via SEM imaging. This way, specifically selected fillers can significantly accelerate CAC hydration and save precious lithium salts which are commonly used to boost the early strength of CAC.

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Impact of carboxylated styrene–butadiene copolymer on the hydration kinetics of OPC and OPC/CAC/AH: The effect of Ca2+ sequestration from pore solution

Cited by 26 publications

References 19 publications

A critical review of the role of ettringite in binders composed of CAC–PC–C$ and CSA–PC–C$

A critical review of the role of ettringite in binders composed of CAC–PC–C$ and CSA–PC–C$

Rejuvenation, embryonic shear bands and improved tensile plasticity of metallic glasses by nanosecond laser shock wave

Impact of sand and filler materials on the hydration behavior of calcium aluminate cement

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