Understanding the role of calcium formate towards hydration and deformation property of light-burned magnesia cement

Chen, Lei; Jiang, Linhua; Liu, Xing; Xu, Peng; Meng, Yuanyuan; Ben, Xunqin; Jin, Weizhun; Chen, Chen; Zhi, Fangfang

doi:10.1016/j.conbuildmat.2021.122995

Cited by 9 publications

(9 citation statements)

References 48 publications

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“…Due to the high dissociation of the compound, the accelerated formation of Ca(OH) 2 occurs while its HCOO¯ ion is able to penetrate the hydrated layers of alite (C 3 A) and belite (C 2 A) where it covers their surface [11,12]. These results are supported by the research reported in [13].…”

Section: Examined Materials and Equipment Used In Experimentssupporting

confidence: 66%

“…The similarity of the nature of the effects of vinyl-acetate/versatate and vinyl-acrylate on the cement matrix is confirmed in [14]. In the case of calcium formate, there is the formation of dense structures, which is noted in works [12,13], so their effect on strength is greater. this low-molecular salt, namely, dispersion of the formed solid mass of calcium formate after filtration and evaporation, some manufacturers label this additive as a redispersed powder.…”

Section: Examined Materials and Equipment Used In Experimentsmentioning

confidence: 72%

“…Comparing the methodology for studying the effects of all three additives to papers [8,10,13], there is a complete absence in the latter of determining the chemical effect on changes in the characteristics of the cement matrix. This is explained by the fact that the cited works [8,10,13] were more focused on the narrow production sphere, which, in turn, is advisable only for one range of production.…”

Section: Discussion Of Results Of the Effect Of Redispersed Additives...mentioning

confidence: 99%

“…In works [8,13,14], where there is a question regarding the effects of redispersed additives, the attention was focused on the most common additives in the local market and their actual impact on the mechanical and kinetic properties of cement mixtures. It is worth noting that in different countries the production methods and product quality are regulated differently.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…In studies under [4,5], comparisons involved various redispersed vinyl copolymer powders. In most contemporary papers [6][7][8][9][10][11][12][13][14], the authors identified three main additives: vinyl acetate/versatate copolymers (VA/VeoVa) and vinyl acrylic (VA Acrylic), as well as calcium formate powder (FormCa).…”

Section: Examined Materials and Equipment Used In Experimentsmentioning

confidence: 99%

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Identifying the influence of redispersed polymers on cement matrix properties

Kovalenko

Токарчук

Kovalenko

et al. 2022

EEJET

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The physical-mechanical influence and chemical effect of calcium formate, vinyl acetate/versatate, and vinyl-acrylate copolymer on the processes of solidification, hardening, and structure formation of the cement matrix were studied during the research reported here. The compositions of mixtures containing additives in the amount of 1, 3, and 5 wt % were investigated. Noteworthy is the water-holding nature of vinyl acetate/versatate and vinyl-acrylate copolymer. With the introduction of appropriate additives, an increase in working time of the mixtures is noted, which was manifested in prolonging the end time of solidification duration. Calcium formate reduced the end time of solidification duration with an increase in the content of the additive. During 28 days of hardening, a decrease in strength gain was observed with an increase in the content of the additive compared to control samples. At 1 wt % of the additive, the decline in strength on day 28 was 8.7 % for calcium formate, 13 % for versatate, and 15.5 % for vinyl-acrylate copolymer. For versatate and vinyl acrylate with the addition of 3 and 5 wt % in the mixture, the loss of strength is 23–25 % and 27–56.7 %, respectively. 5 wt % calcium formate admixture, compared to 3 wt %, on day 7 and day 28 of hardening has a higher strength index. This nature of the effect of additives is explained by the formation of polymer structures throughout the volume of the mixture with the introduction of versatate and copolymer vinyl acrylate, as well as their chemical interaction with the components of the cement binder during hydration in the formed alkaline medium. Calcium formate plays the role of both a filler and a hardening accelerator due to the introduction of an additional amount of calcium ions. The reported results can be used as a basis for continuing to study the effect of redispersed additives on the durability of cement articles, the development of new formulations for building mixtures, and their potential use in the production of concrete.

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Section: Examined Materials and Equipment Used In Experimentssupporting

confidence: 66%