Nano C-S-H seeds prepared from ground granulated blast-furnace slag-carbide slag and its application in Portland cement

Gu, Xianyue; Tan, Hongbo; He, Xingyang; Zhang, Junjie; Li, Maogao; Su, Ying; Yang, Jin

doi:10.1016/j.conbuildmat.2022.127204

Cited by 22 publications

(8 citation statements)

References 57 publications

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“…Three major mass losses can be observed in the TG-DTG curves: strong endothermic peak at ~100 °C, indicating dehydration of water bonded to ettringite and C-(A)-S-H; endothermic at ~430 °C corresponding to decomposition of portlandite, accompanied with dehydroxylation; two further endothermic peaks at ~600 and 750 °C representing decarbonation of calcite . These decomposition steps are consistent with the results of previous studies by others [52][53][54]. Table 4 summarises and compares mass loss values associated with different decompositions of CS/PG/AG samples.…”

Section: Tg-dtgsupporting

confidence: 89%

Effects of using aqueous graphene on behavior and mechanical performance of cement-based composites

Dũng

Watson

et al. 2023

Construction and Building Materials

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Section: Tg-dtgsupporting

confidence: 89%

Effects of using aqueous graphene on behavior and mechanical performance of cement-based composites

Dũng

Watson

et al. 2023

Construction and Building Materials

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“…To end this subsection, C-S-H/PCE composite seeds were also prepared by the hydration of a mixture GGBFS and carbide slag (CS) after wet grinding [ 114 ]. The PC 52.5 activation performances of the resulting powders were characterised by a number of techniques including MIP.…”

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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“…nano TiO2 [56][57][58][59][60][61][62], nano ZnO [59, 61], nano Fe2O3 [58], nano CaCO3 [56,57], carbon nanotubes (CNTs) [60] and calcium silicate hydrate seeds (C-S-Hs) [43,[63][64][65][66][67][68][69][70][71][72][73][74] recently have been adopted to improve mechanical strength of cementitious materials. Nanoparticles could serve as nucleation seeds to boost hydrates formation at the early age, and nanoparticles with lower particle size and similar chemical compositions to hydrates had greater potential to be adopted as early-strength agents in cementitious materials.…”

Section: Introductionmentioning

confidence: 99%

“…Nanoparticles could serve as nucleation seeds to boost hydrates formation at the early age, and nanoparticles with lower particle size and similar chemical compositions to hydrates had greater potential to be adopted as early-strength agents in cementitious materials. Therefore, there existed an elevated interest in analyzing synthetic C-S-Hs as an accelerating agent during the past decade, due to the economic and environmental benefits [63,68,70,71,[73][74][75][76]. C-S-Hs would serve as heterogeneous nucleation sites for hydration products, beneficial for seeding in facilitation of hydration kinetics through expedited nucleation and growth of hydrats, and thus efficaciously promoted cement hydration to produce hydrates [43,70,72,74,75,77].…”

Section: Introductionmentioning

confidence: 99%

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Effects of C-S-Hs-PCE and Na2SO4 on hydration behavior of cement-lithium slag binder

Chen

Liu

et al. 2023

Preprint

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Application of C-S-Hs-PCE and sodium sulfate into Portland cement containing 20 wt% lithium slag (LS) powder was investigated, in order to strengthen early mechanical properties. Synergistic effects of C-S-Hs-PCE and sodium sulfate on hydration properties and microstructure of cement-LS system were analyzed. Results showed that C-S-Hs-PCE was advantageous for modifying fluidity of fresh LS-cement binder, while increased dosage of sodium sulfate decreased dispersibility of fresh paste. C-S-Hs-PCE and sodium sulfate exhibited a synergistic effect on strength enhancement, hydration acceleration as well as setting behavior of LS-cement binder. Sodium sulfate increased alkalinity of interstitial solution and promoted dissolution of LS. Dissolved Al and Si from LS powder reacted with dissolved sulfate ions from sodium sulfate to produce extra hydrates, and C-S-Hs-PCE accelerated pozzolanic reaction as well as hydration reaction via nucleation effect collaborated with dispersing effect. C-S-Hs-PCE accelerated reaction process of sodium sulfate via nucleation effect, and activation effect of sodium sulfate provided more newly-formed hydrates to act as nucleation seeds or crystal skeleton for induce hydration of new phases. The accelerated hydration generated more AFt and C-S-H gel in the matrix. Newly formed hydrates promoted exceedingly the appearance of network, leading to a refinement of pore structure as well as enhancement in mechanical strength. Application of LS into cement as a greener binder could be obtained by synergistic adoption of C-S-Hs-PCE and sodium sulfate.

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Nano C-S-H seeds prepared from ground granulated blast-furnace slag-carbide slag and its application in Portland cement

Cited by 22 publications

References 57 publications

Effects of using aqueous graphene on behavior and mechanical performance of cement-based composites

Effects of using aqueous graphene on behavior and mechanical performance of cement-based composites

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

Effects of C-S-Hs-PCE and Na2SO4 on hydration behavior of cement-lithium slag binder

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