Investigation on the poor fluidity of electrically conductive cement-graphite paste: Experiment and simulation

Wang, Dengquan; Wang, Qiang; Huang, Zongxian

doi:10.1016/j.matdes.2019.107679

Cited by 70 publications

(23 citation statements)

References 56 publications

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“…As a result, it hampers the dissolution of the cement clinker mineral phase. At the same time, it can decrease the diffusion rate of ions (e.g., SO 4 2− and OH − ) which pass through the coating of ettringite taking part in the reaction. As a result, it impedes the further rapid progress of hydration.…”

Section: Testing Methodsmentioning

confidence: 99%

“…Nanomaterials are defined as the materials with particle sizes which are less than 100 nm and have many excellent properties which differ from those of traditional materials [1,2]. Previous studies have shown that the addition of nanomaterials can effectively enhance the physical and mechanical properties of cement-based materials (CBMs) [3,4]. At present, the addition of nano-SiO 2 (NS) in CBM is one of the research priorities.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Nano‐SiO₂ and SAP on Hydration Process of Early‐Age Cement Paste Using LF‐NMR

Zhao

Wan

Xie³

et al. 2020

Advances in Materials Science and Engineering

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The effects of nano-SiO2 and superabsorbent polymer on the hydration process of early-age cement paste are investigated through the physically bound water evolution test by means of the low-field nuclear magnetic resonance technology. The test results show that the hydration process can be characterized by four-stage patterns based on the zero points of the second-order differential hydration curve, i.e., the initial, accelerated, decelerated, and steady periods. The beginning time of each stage is postponed and the hydration duration is prolonged with an increasing water to cement ratio. The beginning time of each stage and the hydration duration are shortened with an increasing content of nano-SiO2. And the beginning time of each stage and the hydration duration are prolonged with an increasing content of superabsorbent polymer. Based on the test data and the Avrami–Erofeev model, a modified hydration model taking the influence of nano-SiO2 and SAP into account is proposed, and the predicted results are consistent with the test results.

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Section: Testing Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Nano‐SiO₂ and SAP on Hydration Process of Early‐Age Cement Paste Using LF‐NMR

Zhao

Wan

Xie³

et al. 2020

Advances in Materials Science and Engineering

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“…Durability in the offshore environment is most commonly related to the resistance to corrosion of reinforced concrete structures, where the protection of the reinforcement plays an important role [52][53][54][55]. The durability requirements provided in the marine concrete specification UFGS-03 [38] indicate a minimum cover thickness for different exposure zones that are summarised in Table 2.…”

Section: Minimum Cover Thicknessmentioning

confidence: 99%

Prediction of Chloride Distribution for Offshore Concrete Based on Statistical Analysis

Liu

et al. 2020

Materials

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Chloride-induced corrosion is the main threat to the service life of concrete structures. In order to better investigate chloride distribution in offshore concrete, this study proposed a new prediction model based on statistical analysis as well as a large body of experimental results collected from various sources. A detailed discussion found that the key influential parameters, such as diffusion coefficient ( D ), surface chloride concentration ( C S ) and penetration depth ( x ) are all highly time-dependent. The exposure zone, water–cement ratio and service time were also considered as relevant factors. The proposed model is then validated by two alternative tests and the results suggest that it is feasible in predicting the chloride content and penetration depth of concrete structures in a marine environment under chloride attack.

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“…The relation of particle morphology of fly ash and cement paste properties, including the fluidity and strength, is studied widely. It is generally accepted that the spherical shape morphology and vitreous character of fly ash provides the lubricant effect [ 31 ] and ball-bearing effect [ 11 , 32 , 33 , 34 ], which improve the fluidity of concrete effectively [ 35 , 36 , 37 , 38 , 39 , 40 ]. In these studies, spherical particles in fly ash, reduce the internal friction and lubricate the surface of cement particles, which is similar with the effect of balls.…”

Section: Introductionmentioning

confidence: 99%

Influence of Particle Morphology of Ground Fly Ash on the Fluidity and Strength of Cement Paste

Wang

Zhao

et al. 2021

Materials

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The grinding process has become widely used to improve the fineness and performance of fly ash. However, most studies focus on the particle size distribution of ground fly ash, while the particle morphology is also an important factor to affect the performance of cement paste. This article aims at three different kinds of ground fly ash from the ball mill and vertical mill, and the particle morphology is observed by scanning electron microscopy (SEM) to calculate the spherical destruction (the ratio of spherical particles broken into irregular particles in the grinding process of fly ash), which provides a quantification of the morphology change in the grinding process. The fluidity of cement paste and the strength of cement mortar are tested to study the relation of spherical destruction and fluidity and strength. The results show that the spherical destruction of ground fly ash in a ball mill is more than 80% and that in a vertical mill with a separation system is only 11.9%. Spherical destruction shows a significant relation with the fluidity. To different addition of ground fly ash, the fluidity of cement paste decreases with the increase of spherical destruction. To the strength of cement paste, particle size distribution and spherical destruction are both the key factors. Therefore, spherical destruction is an important measurement index to evaluate the grinding effect of the fly ash mill.

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Investigation on the poor fluidity of electrically conductive cement-graphite paste: Experiment and simulation

Cited by 70 publications

References 56 publications

Effects of Nano‐SiO₂ and SAP on Hydration Process of Early‐Age Cement Paste Using LF‐NMR

Effects of Nano‐SiO₂ and SAP on Hydration Process of Early‐Age Cement Paste Using LF‐NMR

Prediction of Chloride Distribution for Offshore Concrete Based on Statistical Analysis

Influence of Particle Morphology of Ground Fly Ash on the Fluidity and Strength of Cement Paste

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Investigation on the poor fluidity of electrically conductive cement-graphite paste: Experiment and simulation

Cited by 70 publications

References 56 publications

Effects of Nano‐SiO2 and SAP on Hydration Process of Early‐Age Cement Paste Using LF‐NMR

Effects of Nano‐SiO2 and SAP on Hydration Process of Early‐Age Cement Paste Using LF‐NMR

Prediction of Chloride Distribution for Offshore Concrete Based on Statistical Analysis

Influence of Particle Morphology of Ground Fly Ash on the Fluidity and Strength of Cement Paste

Contact Info

Product

Resources

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Effects of Nano‐SiO₂ and SAP on Hydration Process of Early‐Age Cement Paste Using LF‐NMR

Effects of Nano‐SiO₂ and SAP on Hydration Process of Early‐Age Cement Paste Using LF‐NMR