Effects of nano-C-S-H seed crystal on early-age hydration process of Portland cement

He, Wei; Liao, Gang

doi:10.1080/1536383x.2021.1940969

Cited by 15 publications

(3 citation statements)

References 34 publications

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“…These needle-like crystals are calcium monosulfoaluminate (AFm) and ettringite (AFt), formed during cement hydration, along with calcium silicate hydrate (CSH). Similar findings were previously reported by Bahmani et al [20], MolaAbasi et al [43], Luo et al [41], He and Liao [28] and Amiri et al [11]. Amiri et al [11] analyzed the XRD results of red soil treated with 2% and 6% cement contents.…”

Section: Microstructural Analysis Of Cbr and Rlt Results Using Sem Im...supporting

confidence: 84%

Cement and Fly Ash-Treated Recycled Aggregate Blends for Backfilling Trenches in Trafficable Areas

Yaghoubi,

Al-Taie,

Miri Disfani

et al. 2023

Preprint

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Section: Microstructural Analysis Of Cbr and Rlt Results Using Sem Im...supporting

confidence: 84%

Cement and Fly Ash-Treated Recycled Aggregate Blends for Backfilling Trenches in Trafficable Areas

Yaghoubi,

Al-Taie,

Miri Disfani

et al. 2023

Preprint

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“…Moreover, there are reports employing C-S-H based commercial admixtures, but without stating the origin/details of such admixtures. These works cannot be reproduced and they are cited here just as examples of reporting practices that should be improved [ 54 , 55 , 56 , 57 ]. An intermediate case is the studies by Golewski and Szostak [ 58 , 59 ], where they indicated that the admixture was Master X-Seed, but the actual type was not detailed.…”

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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“…Finely ground quartz and limestone are mostly referred to as non-pozzolanic inorganic materials and may be considered a pozzolan despite exhibiting filler effect. The filler effect works on the principle of filling the voids in the cement matrix, thereby densifying the cement matrix resulting in acceleration of the early age hydration rate [12][13][14][15][16][17][18] . The provision of nucleation sites is responsible for the growth of more CSH and hydrates [19][20] .…”

Section: Introductionmentioning

confidence: 99%

Effect Of Quartz Particle Size and Cement Replacement on Portland Limestone Cement properties

Olu

2022

Jour. of build. mater. Sci.

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This research focuses on investigating the effect of quartz particle sizeand cement replacement on their physicomechnical properties. Portlandlimestone cement (PLC) was employed and replaced with quartz powder(QP) at various particle sizes (1.19 mm, 425 µm, 300 µm, 212 µm, <212µm) and cement replacement between 2.5 wt.% ~ 15 wt.% at interval of2.5 wt.% to study their impact on the cement properties. The PLC chemical composition revealed a relatively low lime and high silica contentcompared to the conventional cement. QP revealed a high silica, lime andsulphur contents compared to natural sand. A high consistence, elongatedsetting times and lower strengths and specific gravities were observed ascement was replaced with QP at a given particle size respectively. Theeffect of replacing cement with QP content between 2.5 wt.% and 15 wt.%at various particle sizes resulted in average increments by 45.32%, 23.13%and 36.06% for initial setting time, final setting time and water demandrespectively. This increase could be related with clinker diminution coupled with enhanced QP surface area and clinker diminution. Similarly, anincrease in the QP surface area at a given cement replacement led to higherwater consistence, retarded setting times and lower strength. The effect ofenhancing the QP’ surface area between 1.19 mm and below 212 µm at agiven cement replacement resulted in average increments by 26.27%, 8.61%and 7.49% for initial and final setting times and water demand respectively.The strength gain of the QP cement blend diminished significantly above30% up to 15 wt.% cement replacement especially beyond 3 days. The lowstrength could be due to the high-water consistence linked with silica content resulting in setting time retardation. The optimal QP content was determined at 5 wt.% owing to the fact that the physicomechnical properties didnot significantly deviate from the properties of control.

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Effects of nano-C-S-H seed crystal on early-age hydration process of Portland cement

Cited by 15 publications

References 34 publications

Cement and Fly Ash-Treated Recycled Aggregate Blends for Backfilling Trenches in Trafficable Areas

Cement and Fly Ash-Treated Recycled Aggregate Blends for Backfilling Trenches in Trafficable Areas

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

Effect Of Quartz Particle Size and Cement Replacement on Portland Limestone Cement properties

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