Fractal Analysis on Pore Structure and Hydration of Magnesium Oxysulfate Cements by First Principle, Thermodynamic and Microstructure-Based Methods

Huang, Jiasheng; Li, Wenwei; Huang, Desheng; Wang, Lei; Chen, E; Wu, Chengyou; Wang, Baoshan; Deng, Hongyang; Tang, Shengwen; Shi, Yan; Li, Yang

doi:10.3390/fractalfract5040164

Cited by 123 publications

(47 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fractal theory is a new method of mathematics, resolving the irregularities in nature [67][68][69][70]. Many researchers [71][72][73][74][75][76][77][78] demonstrated that fractal theory links microstructures with the macro-performance of cement-based materials well, and vice versa.…”

Section: Fractal Dimension Calculationmentioning

confidence: 99%

Influence of MgO on the Hydration and Shrinkage Behavior of Low Heat Portland Cement-Based Materials via Pore Structural and Fractal Analysis

Wang

Liu

et al. 2022

Fractal Fract

Self Cite

View full text Add to dashboard Cite

Currently, low heat Portland (LHP) cement is widely used in mass concrete structures. The magnesia expansion agent (MgO) can be adopted to reduce the shrinkage of conventional Portland cement-based materials, but very few studies can be found that investigate the influence of MgO on the properties of LHP cement-based materials. In this study, the influences of two types of MgO on the hydration, as well as the shrinkage behavior of LHP cement-based materials, were studied via pore structural and fractal analysis. The results indicate: (1) The addition of reactive MgO (with a reactivity of 50 s and shortened as M50 thereafter) not only extends the induction stage of LHP cement by about 1–2 h, but also slightly increases the hydration heat. In contrast, the addition of weak reactive MgO (with a reactivity of 300 s and shortened as M300 thereafter) could not prolong the induction stage of LHP cement. (2) The addition of 4 wt.%–8 wt.% MgO (by weight of binder) lowers the mechanical property of LHP concrete. Higher dosages of MgO and stronger reactivity lead to a larger reduction in mechanical properties at all of the hydration times studied. M300 favors the strength improvement of LHP concrete at later ages. (3) M50 effectively compensates the shrinkage of LHP concrete at a much earlier time than M300, whereas M300 compensates the long-term shrinkage more effectively than M50. Thus, M300 with an optimal dosage of 8 wt.% is suggested to be applied in mass LHP concrete structures. (4) The addition of M50 obviously refines the pore structures of LHP concrete at 7 days, whereas M300 starts to refine the pore structure at around 60 days. At 360 days, the concretes containing M300 exhibits much finer pore structures than those containing M50. (5) Fractal dimension is closely correlated with the pore structure of LHP concrete. Both pore structure and fractal dimension exhibit weak (or no) correlations with shrinkage of LHP concrete.

show abstract

Section: Fractal Dimension Calculationmentioning

confidence: 99%

Influence of MgO on the Hydration and Shrinkage Behavior of Low Heat Portland Cement-Based Materials via Pore Structural and Fractal Analysis

Wang

Liu

et al. 2022

Fractal Fract

Self Cite

View full text Add to dashboard Cite

show abstract

“…Magnesium oxychloride cement (MOC) foam concrete (MOCFC) is an air-hardening cementing material formed by mixing magnesium chloride solution (MgCl 2 ) and lightburned magnesia (i.e., active MgO) [37,38]. In practical application, adding caustic dolomite powder into light-burned magnesite powder can reduce the MOCFC production cost.…”

Section: Overview Of This Special Issuementioning

confidence: 99%

Sustainable High-Performance Hydraulic Concrete

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…It can be seen that the compressive strength is inversely related to graphite powder content, decreased by 10.70% when the graphite powder content was raised from 0% to 3%, and decreased by 30.17% when raised to 9%. The compact structure of the hydration products is an essential guarantee for the formation of highstrength cement-based materials [18,19]. First, due to the poor hydrophilicity of graphite powder [20], it is difficult for the hydration products of cement to adhere on its surface, and the interfacial bonding between cement stone and graphite powder is weak [14].…”

Section: Compressive Strength Performancementioning

confidence: 99%

Influence of Graphite Powder on the Mechanical and Acoustic Emission Characteristics of Concrete

Hao

Meng

et al. 2021

Buildings

View full text Add to dashboard Cite

In this paper, uniaxial compressive strength (UCS) test and three-point bending (TPB) test, together with an acoustic emission (AE) system, were performed to investigate the mechanical properties and AE characteristic changes of concrete with different graphite powder (GP) content. The results show that: (1) Poor adhesion and low interlocking of graphite with cement stone increase the initial defects of concrete, reducing its elastic modulus and the cyclo-hoop effect, and thus weakening the compressive strength. (2) For concrete with a low graphite content, the second sharp rise in ringing counts or energy released during the compressive process can be regarded as a failure alarm. However, as GP content increases, the second sharp rise fades away, while the first sharp rise becomes more visible. At high GP content, the first sharp rise is better for predicting failure. (3) The initial defects caused by GP significantly lower the initial fracture toughness, but its bridging effect greatly increases the critical crack mouth opening displacement and thus significantly enhances the unstable fracture toughness of concrete, by up to 9.9% at 9% GP content. (4) In contrast to compressive process, the sharp increase in AE signals preceding failure during the fracture process cannot be used to predict failure because it occurs too close to the ultimate load. However, as GP can significantly increase the AE signals and damage value in the stable period, such failure precursor information can provide a safety warning for damage development.

show abstract

Fractal Analysis on Pore Structure and Hydration of Magnesium Oxysulfate Cements by First Principle, Thermodynamic and Microstructure-Based Methods

Cited by 123 publications

References 61 publications

Influence of MgO on the Hydration and Shrinkage Behavior of Low Heat Portland Cement-Based Materials via Pore Structural and Fractal Analysis

Influence of MgO on the Hydration and Shrinkage Behavior of Low Heat Portland Cement-Based Materials via Pore Structural and Fractal Analysis

Sustainable High-Performance Hydraulic Concrete

Influence of Graphite Powder on the Mechanical and Acoustic Emission Characteristics of Concrete

Contact Info

Product

Resources

About