Rheological behaviour, setting time, compressive strength and microstructure of mortar incorporating supplementary cementitious materials and nano-silica

Cai, Chen-Bo; Su, Qian; Huang, Shuai; Li, Fuhai; Jin, Hesong; Yu, Xinmin; Liu, Y. R.; Yang, Yang; Chen, Zhao

doi:10.1039/d3ra02635c

Cited by 5 publications

(6 citation statements)

References 43 publications

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“…The prolonged increase in shear time indicates that FA-C plays a role in modifying the viscosity of the mixture over time. This characteristic can significantly influence the ease of handling and placement during construction activities, emphasizing the practical benefits of using FA-C in concrete mixes …”

Section: Resultsmentioning

confidence: 99%

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Strength Characteristics and Rheological Behavior of a High Level of Fly Ash in the Production of Concrete

Boutkhil,

Fellak,

Aouan

et al. 2024

ACS Omega

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This study investigates the valorization of coal fly ash (FA-C) generated by the Jerada thermal power plant, aiming to address the pressing need for sustainable construction practices and reduced greenhouse gas emissions in the concrete industry. It is widely used as a pozzolanic material. The key objective is to harness the potential of FA-C as a supplementary material in concrete production, which not only reduces costs but also contributes to environmental sustainability. To achieve this objective, various concrete mixtures were formulated, with FA-C serving as a partial substitute for cement at percentages ranging from 15 to 50%. According to ASTM standards, compressive strength tests were conducted on standard-sized cylinders at 7 and 28 days. The results revealed that the blend containing 15% FA-C exhibited the highest compressive strength, indicating its effectiveness as a concrete additive. Furthermore, this study delves into the rheological properties of concrete mixes, an essential aspect of successful concrete processing. It was observed that a higher replacement level of FA-C significantly improved the rheology, leading to reduced water demand and a linear decrease in plastic viscosity over time. The rheological parameters stabilized after a certain period, demonstrating the controllability of concrete flow behavior with FA-C. The investigation also employed three analytical methods�Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM)�to comprehensively analyze both raw materials and processed samples. FTIR analysis highlighted the minimal impact of FA particles on hydration product formation, emphasizing the role of FA-C in enhancing the concrete's strength. XRD analysis confirmed the presence of an amorphous phase crucial for FA's reactivity. SEM observations revealed that concrete with 15% FA-C exhibited a more uniform microstructure with aluminosilicate gel, while 50% FA-C mixes showed increased porosity and nonhomogeneity due to unreacted FA particles.

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Section: Resultsmentioning

confidence: 99%

“…This characteristic can significantly influence the ease of handling and placement during construction activities, emphasizing the practical benefits of using FA-C in concrete mixes. 23 …”

Section: Resultsmentioning

confidence: 99%

Strength Characteristics and Rheological Behavior of a High Level of Fly Ash in the Production of Concrete

Boutkhil,

Fellak,

Aouan

et al. 2024

ACS Omega

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“…Rheology is a recognized and effective technique for obtaining essential insights into the microstructure of polymer blends and composites, as evidenced by various studies [ 43 , 44 , 45 , 46 , 47 ]. Specifically, the prepared samples’ linear viscoelastic properties were investigated and illustrated in Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 .…”

Section: Resultsmentioning

confidence: 99%

Effect of Graphene Oxide Localization on Morphology Development and Rheological and Mechanical Properties of Poly(lactic acid)/ethylene vinyl Alcohol Copolymer Blend Composites: A Comprehensive Study

Dadashi,

Ray,

Babaei

2024

Polymers

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This study investigates the rheological, morphological, and mechanical properties of melt-processed polylactide/ethylene vinyl alcohol (70PLA/30EVOH) blend composites containing 0.25, 0.5, and 1 wt.% of graphene oxide (GO) nanoplates. Thermodynamic-based suggested the localization of nanoparticles in EVOH, SEM studies showed that the introduction of GO to the blend increased dispersed droplet size, which was attributed to the localization of GO within EVOH, as confirmed by TEM. The rheology results indicated a decrease in the elasticity for the composite containing 0.25 wt.% of GO compared to the neat blend, which was attributed to the sliding effect of the added GO nanoplatelets. However, samples containing higher amounts of GO nanoplatelets exhibited more excellent elasticity than the neat blend. The increased elasticity was suggestively attributed to the dominance of hydrodynamic interactions, the physical network of added nanoplatelets, and polymer/GO interactions over the sliding role of the GO nanoplatelets at higher loadings. In addition, the effect of the order of mixing was investigated, and the premixing of PLA and GO exhibited a decrease in the droplet radius compared to the neat blend. It was ascribed to the localization of GO nanosheets in the PLA and interface, which was confirmed by rheological results and mechanical assessments.

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“…Combined with the aforementioned heat of hydration test, this shows that the secondary hydration of calcium hydroxide and fly ash occurred and the degree of hydration was deepening [ 40 ]. In addition, with the increase in GSP doping, the peak of quartz (of which the main component is silica) gradually increases, indicating that most of the silica mineral components in GSP belong to inactive substances and the dilution effect of GSP leads to a decrease in the hydration degree [ 41 ], which also decreases calcium hydroxide generation, hence being the reason why the peak in calcium hydroxide is lower in the 15% test group than in the 0% test group in Figure 5 b.…”

Section: Resultsmentioning

confidence: 99%

“…This is because part of the GSP exists in the free form at the cement stone or interface, weakening the bond between mortar and aggregate, and the number of C-S-H gels produced by hydration due to the dilution effect of GSP in excess cannot fill the gap between calcium alumina crystals [45], which is not conducive to strengthening the concrete, and the macroscopic expression of MSC mechanical strength further decreases. and the dilution of GSP leads to a decrease in the hydration degree [41], which also decreases calcium hydroxide generation, hence being the reason why the peak in calcium hydroxide is lower in the 15% test group than in the 0% test group in Figure 5b.…”

Section: Sem Analysis Of Msc With Different Gsp Doping Levelsmentioning

confidence: 98%

Study of Early-Age Hydration, Mechanical Properties Development, and Microstructure Evolution of Manufactured Sand Concrete Mixed with Granite Stone Powder

et al. 2023

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This study explored the potential of granite stone powder (GSP) as a supplementary cementitious material (SCM). The 72 h early hydration process stages of GSP-mixed slurry were analyzed in depth, and the mechanical properties of manufactured sand concrete (MSC) mixed with GSP were investigated. Physical phase types, morphological characteristics, and pore structure evolution were investigated using an X-ray diffractometer, scanning electron microscope, and mercury intrusion approach (MIP). Atomic force microscopy was used to show the interface transition zone between aggregate and slurry in phase images, height images, and 3D images, allowing quantification of ITZ and slurry by calculating the roughness. Gray entropy analysis was used to evaluate the significance of the effect of pore size distribution parameters on mechanical strength, and the GSP-content-mechanical-strength gray model GM (1, 1) was established to predict mechanical strength. The results indicate that, compared with the reference group, the GSP cement slurry system exhibited a delayed hydration process acceleration rate, with a 1.04% increase in cumulative heat of hydration observed in the 5% test group and an 11.05% decrease in the 15% test group. Incorporating GSP in MSC led to decreased mechanical properties at all ages, with significant decay observed when incorporation ranged from 10% to 15%. Although the type of hydration products remained unchanged, there was a decrease in the number of C-S-H gels and gel pores, while large pores increased, resulting in increased porosity and roughness of the interface transition zone and slurry. Large pores (>1000 nm) were found to have the greatest influence on mechanical strength, with gray correlation above 0.86. The GM (1, 1) model yielded accurate predictions, showing good agreement with measured data and thus it can be identified as belonging to a high-precision prediction model category. These findings provide theoretical support and a reference for applying GSP as an SCM, laying the groundwork for data-based specification development.

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Rheological behaviour, setting time, compressive strength and microstructure of mortar incorporating supplementary cementitious materials and nano-silica

Abstract: Major contributions of this study are to reveal mechanism of SF dosage on setting time of cement paste, study rheological, mechanical, and microstructure properties of mortar with SCM and nano-silica, and obtain optimal mix proportion of shotcrete mortar.

Cited by 5 publications

References 43 publications

Strength Characteristics and Rheological Behavior of a High Level of Fly Ash in the Production of Concrete

Strength Characteristics and Rheological Behavior of a High Level of Fly Ash in the Production of Concrete

Effect of Graphene Oxide Localization on Morphology Development and Rheological and Mechanical Properties of Poly(lactic acid)/ethylene vinyl Alcohol Copolymer Blend Composites: A Comprehensive Study

Study of Early-Age Hydration, Mechanical Properties Development, and Microstructure Evolution of Manufactured Sand Concrete Mixed with Granite Stone Powder

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