Hydration kinetics of cement incorporating different nanoparticles at elevated temperatures

Long, Guangcheng; Li, Yuanyuan; Ma, Cong; Xie, Youjun; Shi, Ye

doi:10.1016/j.tca.2018.04.017

Cited by 44 publications

(12 citation statements)

References 25 publications

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“…For one thing, Xiang et al 15 and Li et al 16 pointed out that NS effectively reduced the free water content but raised the compactness, which restrained the expansion deformation of the concrete. For another thing, many studies 28,76,77 reported that the hydration and nucleation rate, the relative content of harmless pore, and the degree of polymerization of C‐S‐H gel were all increased; moreover, the compressive strength could be also raised by near 20%. RHA is another high pozzolanic activity material.…”

Section: Controlling the Thermal Damage Of Steam‐cured Concretementioning

confidence: 99%

Thermal damage and its controlling methods of high‐speed railway steam‐cured concrete: A review

Xiang

Zheng

et al. 2020

Structural Concrete

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The steam curing technology is worldwide applied in the production of concrete prefabricated components, including the production of track slab and girder used for the high‐speed railway in China. However, the steam curing process at elevated temperature will often generate the heat damage on concrete and thus degrade the long‐term performance of the steam‐cured concrete prefabricated components. It is very important to deeply understand the mechanism of heat damage and thus to find effective method reducing or avoiding the damage of steam curing on concrete. The main purpose of this paper is to systematically classify the types of thermal damages on concrete during the steam curing and its mechanism. The influences of main factors on three thermal damages such as the unrecoverable expansion deformation, the surface layer defect, and the embrittlement of the steam‐cured concrete are discussed in detail. The controlling methods of thermal damages including optimization of the steam curing regime and mixing proportions, the addition of supplementary additives, the self‐healing technology, and other curing technology are compared and summarized based on the literatures. Finally, suggestions for future research are proposed in order to effectively reduce or even avoid the thermal damage of the steam‐cured concrete. And also, some new technology for developing the green and high performance early strength concrete with low CO2 emission are presented.

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Section: Controlling the Thermal Damage Of Steam‐cured Concretementioning

confidence: 99%

Thermal damage and its controlling methods of high‐speed railway steam‐cured concrete: A review

Xiang

Zheng

et al. 2020

Structural Concrete

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“…17 Addition hydration seeds accelerates its formation. [18][19][20] However, most studies focused on macro indexes, such as hydration heat, pH value, ionic concentration, and potentiometry, 2,14,21,22 which can help to identify hydration process and indirectly deduce information of C-S-H growth. However, related molecular processes are mostly unexplored.…”

Section: Introductionmentioning

confidence: 99%

Atomic‐level structure evolution of calcium silicate hydrate nucleation process, the amorphous‐to‐crystalline pathway

Zhang,

Wu,

Wang

et al. 2024

J Am Ceram Soc.

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Calcium silicate hydrate (C‐S‐H) synthesis follows multistep nucleation processes ranging from amorphous globules to nanocrystals. This type of nonclassical nucleation pathway attracts extensive interest and yet related molecular processes are mostly unexplored. Herein, atomic‐level structure evolution during this process is unveiled. From inside to outside of the globule, the atomic arrangement evolves from amorphous configuration to layered stacking of calcium silicate layers with layers spaced by 1.1 nm. Numerous cations surrounding the globules provide extra calcium ions to form nano C‐S‐H foils at the edge of the globule. The polymerization to form calcium silicate chains has almost been completed before 5 min reaction, and the C‐S‐H structure formation is basically based on the self‐assembly to be calcium silicate layers and then lamellar crystal inside the globule. Silicate chain defects inhibit a‐ and c‐axes crystallization, but promote b‐axes one, leading to anisotropic growth of crystalline C‐S‐H. The defects lead to the crystallization pathways conversion from Si–O–Si bonds formation to Ca2+ electrostatic linking.

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“…[24], it was demonstrated that after adding hydrate seed-polycarboxylate (C-S-Hs-PCE) and sodium sulfate (SS), the setting time was shortened and the strength of cement paste improved drastically. The time of cement hydratation is also influenced by nanoparticles [25,26], or by mineral admixtures through the impact of backfill [27,28].…”

Section: Introductionmentioning

confidence: 99%

Logistic Model of Phase Transformation of Hardening Concrete

2022

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The objective of this study was to analyze the effects of the modification of cementitious materials with the admixture of a superplasticizer and mineral additive in the form of microsilica. We analyzed the hardening process of cementitious materials as an autocatalytic transformation from a viscous liquid to a pseudo-solid body. The main achievement of the research involved the identification of changes in the content of the solid phase during the hardening of concrete mix as a model of the logistic curve. The phase transformation process begins with a viscous liquid which consists of water, cement, microsilica, superplasticizer and sand. The laboratory tests comprised research on the development of the kinetics of hardening heat of binder cement pastes and the development of mechanical properties of concrete in the hardening process. Three groups of mixtures with different concentrations of binders, determined by different water–binder indexes, were used. The first group was made up by cement paste consisting of cement and water. The second group contained cement paste from the first group supplemented with a superplasticizer, and the third group comprised the cement paste as in the second group, but additionally modified with microsilica. Using appropriate analyses, we defined a mathematical model of the phase transformation process. The model was then used for computer-aided numerical analyses. This made it possible to compare the relevant parameters of the logistic curve obtained for the seven different concrete mixes analyzed. Active impact of the applied mineral additive (microsilica) and that of chemical admixture in the form of a superplasticizer was demonstrated. All approximations of the measurement results with the use of a logistic curve had a determination level of over 0.98, indicating high agreement.

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Hydration kinetics of cement incorporating different nanoparticles at elevated temperatures

Cited by 44 publications

References 25 publications

Thermal damage and its controlling methods of high‐speed railway steam‐cured concrete: A review

Thermal damage and its controlling methods of high‐speed railway steam‐cured concrete: A review

Atomic‐level structure evolution of calcium silicate hydrate nucleation process, the amorphous‐to‐crystalline pathway

Logistic Model of Phase Transformation of Hardening Concrete

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