Study on the effect of CaCO3 whiskers on carbonized self-healing cracks of cement paste: Application in CCUS cementing

Gong, Peng; Zhang, Chunmei; Wu, Zhiqiang; Zhang, Gaoying; Mei, Kaiyuan; Gao, Qiang; Cheng, Xiaowei

doi:10.1016/j.conbuildmat.2022.126368

Cited by 33 publications

(5 citation statements)

References 32 publications

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“…The early strength of belite cement was enhanced by the calcium carbonate generated during carbonation curing and the C-S-H gel, thus improving its micro-mechanical properties stability in cement hydration environment [9]. Moreover, the diffraction peaks of SiO 2 were observed in samples prepared with CaS reductant after curing 56 d (Fig.…”

Section: Resultsmentioning

confidence: 93%

Effect of reductant on property and CO 2 sequestration for belite cement from phosphogypsum

Li,

Liu,

et al. 2024

Preprint

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Gypsum can be decomposed at low-temperature by adding reductant, which is beneficial to obtain cement. The effects of different reductant on the phases of belite cement raw meals were studied by calcining at 1300℃ for 2h and using phosphogypsum as raw materials. Diffraction peaks of calcium sulfate were not observed in the samples when 10 wt% activated carbon was added and the molar ratio of CaS to CaSO4 was 3, respectively. The Sulfur trioxide contents of in the clinkers were 0.80 and 0.64 wt%, respectively. The effect of carbonation curing on the cement properties was also studied. Carbonation curing can promote cement hydration and increase strength at 20 ℃, 75 % relative humidity and 20% CO2 concentration. As the carbonation curing age increased, the compressive strengths of the samples gradually enhanced. When 10 wt% carbon was employed as the reducing agent, compressive strengths of the samples were 15.5, 15.6, and 15.6 MPa after carbonation curing at 3, 7 and 28 d, respectively. When CaS was employed as the reducing agent, the compressive strengths of the samples were 19.8, 27.2, and 34.1 MPa after carbonation curing for 3, 7 and 28 d, respectively. The carbon dioxide sequestration contents of the samples prepared with a 10 wt% carbon and CaS reductant, were 11.6% and 9.2% after carbonation curing for 28 d, respectively. These findings demonstrate the potential to use phosphogypsum with various reductants to enhance the quality of belite cement and at the same time consume more CO2 in the atmosphere during curing process.

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Section: Resultsmentioning

confidence: 93%

Effect of reductant on property and CO 2 sequestration for belite cement from phosphogypsum

Li,

Liu,

et al. 2024

Preprint

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“…CW bridges and deflects microcracks in the cement matrix, resulting in a denser matrix [27,89]. Furthermore, the inclusion of the CW decreases the orientation index of CH, indicating that it restricts the area available for CH crystal growth and improves the density of the cement paste.…”

Section: Calcium Carbonate Whiskers (Cws)mentioning

confidence: 99%

“…Further research was conducted to investigate its effect on hydration kinetics and its role in ternary systems [30,40]. Kunther et al [111,123] used 27 Al MAS NMR and 29 Si MAS NMR to determine the products at different reaction ages based on GEMS. They optimized the results of the thermodynamic tests and proposed to carry out the reaction kinetics calculations of the components in the ternary system.…”

Section: Hydration Kineticsmentioning

confidence: 99%

“…It is usually widely distributed as a component of the shells of marine organisms. Depending on the differences in their size [23,24], crystalline shape [25,26], and morphology [27,28], they can play different roles in concrete, such as aggregates [29], fillers [30], and microfibers [31]. Numerous studies have shown that the addition of limestone improves various properties of concrete [14,32].…”

Section: Introductionmentioning

confidence: 99%

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Recent Developments on the Effects of Micro- and Nano-Limestone on the Hydration Process, Products, and Kinetics of Cement

Li,

Cao

2024

Materials

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Limestone is commonly used in cement concrete due to its unique nature and type. It has physical effects (nucleation effect and dilution effect) and chemical effects on the hydration process of cement. This paper reviews the effects of three representative limestone materials on the hydration process, hydration products, and hydration kinetics. In the hydration process, the reaction was delayed by limestone powder with a particle size larger than 20 μm and calcium carbonate whiskers due to their dilutive effect. On the other hand, limestone powder with a particle size smaller than 20 m and calcium carbonate nanoparticles facilitated the reaction through nucleation and chemical effects. Limestone has a similar effect on hydration products, promoting the production of C-S-H through nucleation. The mechanism of action for this nucleation effect depends on the differences in crystalline form and particle size of the three types of micro- and nano-calcium. Chemical effects impact the amount of AFt produced, with the generation of new products being the main reaction influenced by the limestone admixture.

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“…The high brittleness and high porosity of cement-based materials severely limit their use of cement-based materials. Therefore, many researchers have completed a lot of research on strengthening and toughening cement-based materials, such as adding nanomaterials such as carbon tubes [ 14 , 15 , 16 ], limestone powder [ 17 ], graphene [ 18 ], whiskers [ 19 ], and steel fibers [ 20 ]. As a two-dimensional carbon material, graphene nanoplates (GNPs) have a thickness of less than 100 nm and a diameter of several microns [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Graphene Nanoplates on Dispersion, Hydration Behavior of Sulfoaluminate Cement Composites

et al. 2022

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Sulfoaluminate cement (SAC) is a low carbon ecological cement with good durability and is widely used in various projects. In addition, graphene nanoplates (GNPs) have excellent thermal, electrical, and mechanical properties and are excellent nano-filler. However, the hydration behavior of GNPs on SAC is still unclear. In this paper, the effect of GNPs on SAC hydration was investigated by isothermal calorimetry, and the hydration kinetic model and hydration kinetic equation of SAC was established, explaining the differences in cement hydration processes with and without GNPs on SAC based on a hydration kinetic model. Results indicate that the hydration exotherm of SAC mainly includes five stages: the initial stage, the induction stage, the acceleration stage, the deceleration stage, and the stable stage. The addition of GNPs promoted the hydration exotherm of SAC and accelerated the hydration reaction. Different from the hydration reaction of Portland cement, the hydration reaction of SAC is mainly a diffusion–reaction process.

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Study on the effect of CaCO3 whiskers on carbonized self-healing cracks of cement paste: Application in CCUS cementing

Cited by 33 publications

References 32 publications

Effect of reductant on property and CO 2 sequestration for belite cement from phosphogypsum

Effect of reductant on property and CO 2 sequestration for belite cement from phosphogypsum

Recent Developments on the Effects of Micro- and Nano-Limestone on the Hydration Process, Products, and Kinetics of Cement

Influence of Graphene Nanoplates on Dispersion, Hydration Behavior of Sulfoaluminate Cement Composites

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