The Influence of the Acceleration Admixture Type and Composition of Cement on Hydration Heat and Setting Time of Slag Blended Cement

Pizoń, Jan; Łaźniewska-Piekarczyk, Beata; Miera, Patrycja

doi:10.3390/ma15082797

Cited by 3 publications

(2 citation statements)

References 66 publications

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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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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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“…However, a recent and innovative field of research brings a technology called by C-S-H seeds as a possible solution to overcome this problem, as seen in Stephan (2018), Li, Zhang, Xu andMonteiro (2020); Pedrosa, Reales, Reis, Paiva, and Fairbairn (2020), John (2022) and Pizon, Piekarczyk & Miera (2022). Because of the low content of this additive, its environmental impact and additional cost is considered negligible (Land & Stephan, 2015;John, Epping & Stephan, 2019;Li et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

The cement industry in accordance with the UN Sustainable Development Goals through the C-S-H seeds technology – A critical review

Guimarães,

Tamura,

Costa

2023

TerraPlural

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The United Nations (UN) has stablished several goals and actions in order to mitigate climate change and reduce its consequences. As one of the main responsible of global anthropogenic carbon emissions, cement industry has a great potential on collaboration to achieve such goal. New solutions are studied to decrease the environmental impact caused by cement production. Clinker content replacement by Supplementary Cementitious Materials (SCM) is indicated as the more feasible one. Despite the environmental benefit offered by the action, the composition modification of the binder leads to initial performance issues. Cementitious materials with lower clinker content and presence of SCM presents higher setting time and lower early strength, which limits the application of the measure regardless of its environment advantage. The use of C-S-H (calcium silicate hydrate) seeds additive can overcome such effect, since it accelerates cement hydration, improving its initial performance. Therefore, such additional input enables the vaster application of low carbon cements. Nonetheless, the manufacture of C-S-H seeds also emits greenhouse gases with environmental impacts comparable to cement production. Hence, the objective of this study is to analyse and discuss the contribution of the use of C-S-H seeds on the potential carbon footprint reduction of cementitious materials and if this measure could help to achieve the goals stablished by the UN. The reviewed papers pointed the additive as a feasible solution to low carbon cements production which allays technical and environmental requirements. Therefore, it was concluded that C-S-H seeds can effectively contribute to achieve the UN stablished goals towards climate change mitigation.

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Heat of hydration in ultralight cementitious foams incorporating metakaolin and microencapsulated phase change material

Klemczak,

Gołaszewska,

Gołaszewski

2024

J Therm Anal Calorim

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The paper presents the results of a study on the hydration heat of ultralight cementitious foams envisaged as insulation materials for building envelopes. The examined porous foam-cement material was additionally enhanced by embedded microencapsulated phase change material (PCM) to improve the desired thermal properties of the material. The heat emission and heat flow were measured at 20 °C and 30 °C for 168 h using the isothermal calorimeter. The experimental study comprised composites with dry densities of 240 kg m−3 and 480 kg m−3, two concentrations of protein-based foaming agent (2% and 4%) and two dosages of the embedded PCM material (10% and 20%). The reference composite without PCM was also tested. The effect of the necessary admixtures used to achieve the stability of ultralight cementitious foams was also examined. The results showed that hydration in ultralight foam-cement composites is retarded, and the values of heat released are lower than those of the paste used to produce the composites. In this regard, the main factors contributing to the lower heat released and its lower rate are the excess water from the foam, the dosage of the foaming agent and the admixtures introduced to achieve the stability of the ultralight composite. The stabiliser was found to be the most retarding admixture. Considering PCM, which was added at 10% and 20% of the paste volume, a rather low influence on the course of the hydration process was observed due to the overall composition of ultralight cementitious foams specially modified for each assumed content of PCM.

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The Influence of the Acceleration Admixture Type and Composition of Cement on Hydration Heat and Setting Time of Slag Blended Cement

Cited by 3 publications

References 66 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

The cement industry in accordance with the UN Sustainable Development Goals through the C-S-H seeds technology – A critical review

Heat of hydration in ultralight cementitious foams incorporating metakaolin and microencapsulated phase change material

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