Impact of C-S-H seeding on hydration and strength of slag blended cement

Li, Xuerun; Bizzozero, Julien; Hesse, Christoph

doi:10.1016/j.cemconres.2022.106935

Cited by 65 publications

(17 citation statements)

References 37 publications

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“…Figure 3 displays a similar calorimetric study for blend cement pastes composed of 50 wt% of CEM I 52.5 R and 50 wt% of GGBFS from [ 80 ]. In this case, the pastes were seeded with 3 wt% of HyCon ® S, and increasing amounts of anhydrite.…”

Section: Activation Of Cement Hydration By C-s-h Nucleation Seedingmentioning

confidence: 99%

“…To the best of the authors knowledge, so far there are only two papers reporting in situ RQPA results for C-S-H seeded samples during the first day of hydration [ 71 , 80 ]. From LXRPD data, Li et al [ 80 ] reported faster dissolution rates of C 3 S, C 3 A, and anhydrite for the seeded PC-GGBFS blends. However, the same study reported a decrease in ettringite content after seeding.…”

Section: Activation Of Cement Hydration By C-s-h Nucleation Seedingmentioning

confidence: 99%

“…Symbols (lines and arrows) as in Figure 2 . Adapted from reference [ 80 ] with permission from Elsevier.…”

Section: Figurementioning

confidence: 99%

“…Lower overall porosities and pore threshold entry sizes are clearly observed after seeding. Reproduced from reference [ 80 ] with permission from Elsevier.…”

Section: Figurementioning

confidence: 99%

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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: Activation Of Cement Hydration By C-s-h Nucleation Seedingmentioning

confidence: 99%

Section: Activation Of Cement Hydration By C-s-h Nucleation Seedingmentioning

confidence: 99%

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

et al. 2023

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“…The use of C-S-H seeding demonstrates the improvement of the performance to strength since the microstructure of the hardened cement is fine and the hydration process was accelerated [ 28 ]. Introduction of iron content to the structure of validated cement causes the increase in the intensity of the IR band centered at about 970 and 3640 cm −1 ( Figure 4 ), showing the formation of C-S-H and Ca(OH) 2 , respectively in the network structure.…”

Section: Resultsmentioning

confidence: 99%

Nanocomposites as Substituent of Cement: Structure and Mechanical Properties

et al. 2023

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To date, the scientific research in the field of recycling of construction and demolition wastes was focused on the production of concrete, cements, and bricks. The attainment of these products was limited to the addition of suitable binder contents, such as lime or cement, compaction, and possibly heat treatment, without a concrete recycling method. In this paper, new cement materials consisting of 2.5 weight% composite and originating from construction and demolition waste powder, were prepared and investigated in view of applications in the construction industry as a substituent of cement. The materials with recycled powder from construction and demolition wastes were characterized by X-ray diffraction (XRD), infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy. The XRD data indicate vitroceramic structures with varied crystalline phases. The NMR relaxometry data show four reservoirs of water associated with bounded water and with three types of pores in the composite construction material. The micro-Vickers hardness was measured to reflect the influence of composite nature in the local mechanical properties of the composite-cement for the mixture with Portland cement and (EC) expired cement.

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Comparing the Carbonation Performances of a Low-Clinker Blended Slag Cement with an Alkali-Activated Slag via Thermodynamic Modelling

2023

RILEM Bookseries

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Impact of C-S-H seeding on hydration and strength of slag blended cement

Cited by 65 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

Nanocomposites as Substituent of Cement: Structure and Mechanical Properties

Comparing the Carbonation Performances of a Low-Clinker Blended Slag Cement with an Alkali-Activated Slag via Thermodynamic Modelling

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