Effect of calcium silicate hydrate – polycarboxylate ether (C-S-H–PCE) nanocomposite as accelerating admixture on early strength enhancement of slag and calcined clay blended cements

Kanchanason, V.; Plank, Johann

doi:10.1016/j.cemconres.2019.01.007

Cited by 85 publications

(21 citation statements)

References 30 publications

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“…Meanwhile, the C‐S‐H/PCE nanocomposites could significantly enhance the early strength, without causing a notably negative effect on the development of long‐term strength of cementitious materials. Moreover, it was reported that C‐S‐H/PCE nanocomposites could also stimulate the pozzolanic reaction of slag, calcined clay, and fly ash 20–23 . Therefore, the C‐S‐H/PCE nanocomposites are considered as an effective accelerating admixture in a blended cement system.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, it was reported that C-S-H/PCE nanocomposites could also stimulate the pozzolanic reaction of slag, calcined clay, and fly ash. [20][21][22][23] Therefore, the C-S-H/PCE nanocomposites are considered as an effective accelerating admixture in a blended cement system. Nevertheless, as nanomaterials, the issue of stability is ineluctable.…”

Section: Introductionmentioning

confidence: 99%

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Calcium‐silicate‐hydrates/polycarboxylate ether nanocomposites doped by magnesium: Enhanced stability and accelerating effect on cement hydration

et al. 2022

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C‐S‐H/PCE (calcium‐silicate‐hydrates/polycarboxylate ether) nanocomposites have a significant accelerating effect on early hydration and early strength development of cementitious materials. In this study, magnesium ions are doped into C‐S‐H/PCE nanocomposites, and it is found that C‐S‐H/PCE nanocomposites doped by appropriate magnesium ions have much better stability. Besides, the accelerating effects of the modified nanocomposites on early cement hydration also get improved. The doped magnesium ions displace calcium ions and promote the absorption of PCE. Moreover, the incorporation of magnesium ions results in two unique morphologies of nanocomposites, that is, globule and gel. The globules are semi‐crystalline similar to C‐S‐H, while the gels are amorphous and have more branched silicate chains.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Calcium‐silicate‐hydrates/polycarboxylate ether nanocomposites doped by magnesium: Enhanced stability and accelerating effect on cement hydration

et al. 2022

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“…36−39 Furthermore, as reported by Plank et al, the starting time of the pozzolanic reaction of fly ash can be dramatically shifted from 28 days to 15 h in a fly ash−cement system with the addition of 2.0 wt % C−S−H seeds. 40,41 Nevertheless, the combined application of C−S−H seeds and SS for the enhancement of the reaction of fly ash has rarely been reported so far. Although, in our recent study, 42 the synergistic effect of SS and C−S−H seeds on the enhancement of reaction of fly ash at 1 day was observed.…”

Section: ■ Introductionmentioning

confidence: 99%

Effect of Sodium Sulfate and C–S–H Seeds on the Reaction of Fly Ash with Different Amorphous Alumina Contents

Zou

Shen

et al. 2020

ACS Sustainable Chem. Eng.

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Fly ash (FA) is one of the largest industrial wastes in the world, and its storage is still accumulating. To meet this challenge, one of the most effective and promising ways is to increase the dosage of fly ash in cement-based materials. However, the slow reaction of FA restricts the high content substitution of cement by FA. Therefore, a better knowledge for enhancing the reaction of FA is essential toward achieving a green and sustainable cementitious binder. Previous research demonstrated the synergistic effect on enhancing the reaction of FA with the combined application of sodium sulfate (SS) and calcium–silicate–hydrates (C–S–H) seeds, while the mechanism of the synergistic effect is unclear. In this study, the effect of SS and C–S–H seeds on the reaction of FA with different amorphous alumina contents is systematically investigated. The results show that the effect of SS and C–S–H seeds on the reaction of FA is closely related to the amorphous alumina content and the reaction time. Moreover, the underlying mechanism is revealed and may provide guidance for the massive utilization of FA and other Al-rich mineral admixtures.

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“…Deyu Kong [39] found that nano C-S-H gel can mitigate the retardation caused by the sucrose. Kanchanason and Plank [40] synthesized nano C-S-H and polycarboxylate (PCE) comb polymer suspension, and they found that this suspension (solid content equals 2% by weight of cement) could accelerate the hydration of slag and calcined clay blended cements and increase the compressive strength by 240% after 16 h of hydration compared to the control groups. Wang et al [38] synthesized nano C-S-H together with polycarboxylate (PCE) and polysulfonate (PSE), which were applied as stabilizer, and they found that the induction period of cement could be clearly shortened.…”

Section: Introductionmentioning

confidence: 99%

Effects of Highly Crystalized Nano C-S-H Particles on Performances of Portland Cement Paste and Its Mechanism

et al. 2020

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In order to improve the early age strength of ordinary Portland cement-based materials, many early strength agents were applied in different conditions. Different from previous research, the nano calcium silicate hydrate (C-S-H) particles used in this study were synthesized through the chemical reaction of CaO, SiO2, and H2O under 120 °C using the hydrothermal method, and the prepared nano C-S-H particles were highly crystalized. The influences of different amounts of nano C-S-H particles (0%, 0.5%, 1%, 2% and 3% by weight of cement) on the setting time, compressive strength, and hydration heat of cement paste were studied. The hydration products and microstructure of the cement paste with different additions of nano C-S-H particles were investigated through thermogravimetry-differential thermal analysis (TG-DTA), X-ray powder diffraction (XRD), and scanning electron microscope (SEM) tests. The results show that the nano C-S-H particles could be used as an early strength agent, and the early strength of cement paste can be increased by up to 43% through accelerating the hydration of tricalcium silicate (C3S). However, the addition of more than 2% nano C-S-H particles was unfavorable to the later strength development due to more space being left during the initial accelerated hydration process. It is suggested that the suitable content of the nano C-S-H particles is 0.5%−1% by weight of cement.

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Effect of calcium silicate hydrate – polycarboxylate ether (C-S-H–PCE) nanocomposite as accelerating admixture on early strength enhancement of slag and calcined clay blended cements

Cited by 85 publications

References 30 publications

Calcium‐silicate‐hydrates/polycarboxylate ether nanocomposites doped by magnesium: Enhanced stability and accelerating effect on cement hydration

Calcium‐silicate‐hydrates/polycarboxylate ether nanocomposites doped by magnesium: Enhanced stability and accelerating effect on cement hydration

Effect of Sodium Sulfate and C–S–H Seeds on the Reaction of Fly Ash with Different Amorphous Alumina Contents

Effects of Highly Crystalized Nano C-S-H Particles on Performances of Portland Cement Paste and Its Mechanism

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