Belite clinkers with increasing aluminium content: Effect of calcium aluminates on calcium silicate hydration

Redondo-Soto, Cinthya; Gastaldi, Daniela; Irico, Sara; Canonico, Fulvio; Aranda, Miguel Á. G.

doi:10.1016/j.cemconres.2022.107015

Cited by 9 publications

(2 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reversible adsorption of ions from the pore solution, in turn, has three main consequences: (i) the changes in the ions concentration in the pore solution creates local concentration gradients, which could alter the dissolution pathways in cementitious systems, (ii) the C-S-H growth mechanism(s) could be changed due to the adsorbed species, and (iii) most importantly, the changes in SO 4 2− and Al 3+ concentrations in pore solution indirectly affect, it may even delay, alite dissolution. The roles of aluminate [ 19 , 33 , 34 , 35 , 36 ] and sulphate [ 37 , 38 ] species in alite hydration rate is being very actively researched. These effects are not directly related to the nucleation process.…”

Section: Brief Discussion On C-s-h Nucleation Seeding Mechanism As It...mentioning

confidence: 99%

“…This narrowing, i.e., faster deceleration, is generally observed in C-S-H seeded pastes and its origin is not yet fully established. It likely arises from two contributions: (i) faster/enhanced aluminate dissolution (second peak) results in larger Al 3+ species concentration in the pore solution, which is known to delay alite hydration [ 19 , 33 , 34 , 35 , 36 ]; and (ii) hydration acceleration consumes more water at very early ages, which may lead to slower hydration rates, after the main peaks, because of lower diffusion rates. Liquid water is both a reactant and the medium where all chemical (hydration) reactions take place.…”

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

confidence: 99%

See 1 more Smart Citation

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

et al. 2023

View full text Add to dashboard Cite

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.

show abstract