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

Zhu, Hongwei; Zou, Fubing; Wang, Fazhou; Hu, Chuanlin

doi:10.1111/jace.18383

Cited by 11 publications

(2 citation statements)

References 37 publications

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“…It has also been recently reported that C-S-H/PCE nanocomposites incorporating magnesium ions, especially at the Ca/Si ratio of 0.8 and Mg/Si ratio of 0.1, have better stabilities [ 117 ].…”

Section: C-s-h Nucleation Seedsmentioning

confidence: 99%

Recent Advances in C-S-H Nucleation Seeding for Improving Cement Performances

et al. 2023

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Reducing cement CO2 footprint is a societal need. This is being achieved mainly by replacing an increasing amount of Portland clinker by supplementary cementitious materials. However, this comes at a price: lower mechanical strengths at early ages due to slow pozzolanic reaction(s). This is being addressed by using accelerator admixtures. In this context, calcium silicate hydrate nucleation seeding seems to have a promising future, as it can accelerate cement and pozzolanic reactions at early ages, optimising their microstructures, without compromising late strength and durability performances. In fact, these features could even be improved. Moreover, other uses are low temperature concreting, precasting, shotconcrete, etc. Here, we focus on reviewing recent reports on calcium silicate hydrate seeding using commercially available admixtures. Current knowledge on the consequences of nucleation seeding on hydration reactions and on early and late mechanical strengths is discussed. It is noted that other features, in addition to the classic alite hydration acceleration, are covered here including the enhanced ettringite precipitation and the very efficient porosity refinement, which take place in the seeded binders. Finally, because the seeded binders seem to be denser, durability properties could also be enhanced although this remains to be properly established.

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Section: C-s-h Nucleation Seedsmentioning

confidence: 99%

Recent Advances in C-S-H Nucleation Seeding for Improving Cement Performances

et al. 2023

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“…The size distributions of nano C-S-H is an important factor affecting the early reinforcement effects [31,32]. Theoretically, there is a negative correlation between the size of nano C-S-H and its nucleation effects; therefore, nano C-S-H with smaller size always results in a higher early strength for a cement-based matrix.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Nano-Sized C-S-H and Its Acceleration Mechanism on Portland Cement Hydration at Different Temperatures

Fang

Zhang

et al. 2023

Materials

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Nano-sized C-S-H, a promising early strength agent, can accelerate the hydration rate of Portland cement and increase the early compressive strength of cement-based composites effectively. Nano-sized C-S-H suspensions with different contents of effective constituent and size distributions were prepared by a convenient coprecipitation method and the microstructures were analyzed by Zeta potential, XRD and FT-IR. The exothermic heat, early mechanical properties, hydration degree and hydration products of cement with/without nano-sized C-S-H cured at different temperatures were studied by hydration exothermic, XRD, SEM and TG analysis. Nano-sized C-S-H with semi-crystalline structures was prepared, and the size of the nano-sized C-S-H seeds showed an obvious increase with an increase in theoretical concentration, and slight precipitation in the suspension was observed when the theoretical concentration was 2%. The XRD, TG and SEM analyses showed that nano-sized C-S-H expedites the reaction of C3S in the first 24 h; therefore, the hydration induction period is obviously shortened. The 8 h, 16 h and 24 h compressive strength of mortars containing nano-sized C-S-H increased by 176.0%, 145.6% and 43.9%, respectively, compared with the reference mortar. The enhancement effects of nano-sized C-S-H at 10 °C were lower than that at 20 °C.

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Ensemble machine learning and Shapley additive explanations for the ability of C-S-H seeds to accelerate cement hydration

Yang,

Cheng

2024

J Mater Sci

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

Cited by 11 publications

References 37 publications

Recent Advances in C-S-H Nucleation Seeding for Improving Cement Performances

Recent Advances in C-S-H Nucleation Seeding for Improving Cement Performances

Preparation of Nano-Sized C-S-H and Its Acceleration Mechanism on Portland Cement Hydration at Different Temperatures

Ensemble machine learning and Shapley additive explanations for the ability of C-S-H seeds to accelerate cement hydration

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