Changes in fractal dimension and durability of ultra-high performance concrete (UHPC) with silica fume content

Luan, Congqi; Wang, Jingyu; Gao, Jinxu; Wang, Jinbang; Du, Peng; Zhou, Zonghui; Huang, Yongbo; Du, Shuang

doi:10.1007/s43452-022-00443-3

Cited by 17 publications

(5 citation statements)

References 63 publications

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“…In addition, a Ds value lower than 2 or higher than 3 was meaningless, according to the fractal theories [ 56 , 57 ]. The Ds values of all the UHPC varied between 2.589 and 2.683, which satisfied the calculations of the fractal theory [ 18 , 58 ]. The Ds value of B2 obtained the most considerable value of 2.683 due to the synergy effect of the USL and LS.…”

Section: Resultssupporting

confidence: 79%

“…It was incomplete to evaluate the effect of the synergistic action of the USL and LS on the pore structure of the UHPC using the porosity. To deeply understand the synergistic action on the microstructures of the UHPC, fractal geometry provided an effective way to investigate the complexity and heterogeneity of the microstructures of the UHPC, which also linked the macroscopic performance of the UHPC to their microscopic characteristics [ 18 , 19 , 20 ]. The complex and irregular pore structure was quantified by the fractal dimension ( D s) values [ 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

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The Synergistic Effects of Ultrafine Slag Powder and Limestone on the Rheology Behavior, Microstructure, and Fractal Features of Ultra-High Performance Concrete (UHPC)

et al. 2023

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This study investigated the effect of the interaction between ultrafine slag powder (USL) and limestone (LS) on the rheology behavior, microstructure, and fractal features of UHPC. The results indicated that B2 with mass ratio of 2:1 between the USL and LS obtained the highest compressive strength and the lowest yield stress. The combination of the USL and LS facilitated the cement hydration, ettringite, and monocarboaluminate (Mc) formation, as well as the increase in the polymerization of the C–S–H. The synergistic action between the USL and LS refined the pore structure due to the formation of the Mc, compensating for the consumption of the CH by the pozzolanic reaction, which provided a denser microstructure in the UHPC. The fractal dimension (Ds) of the UHPC was strongly related to the concrete pore structures and the compressive strength, which demonstrated that a new metric called the Ds value may be used to assess the synergistic effect of the UHPC.

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Section: Resultssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

The Synergistic Effects of Ultrafine Slag Powder and Limestone on the Rheology Behavior, Microstructure, and Fractal Features of Ultra-High Performance Concrete (UHPC)

et al. 2023

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“…This value coincides with the results that other authors have presented [87][88][89], whose ranges were between 1.77 and 2.12 × 10 −12 m 2 /s, 1.11 and 1.50 × 10 −12 m 2 /s and 1.50 and 2.00 × 10 −12 m 2 /s. In other cases however, lower values have been reported and range from 0.83 m 2 /s [90] to 2.00 × 10 −14 m 2 /s [71], which once again demonstrates the very disperse results in the literature. Nevertheless, some authors coincide in pointing out that UHPCs are more brittle than HPC [91][92][93], which results in poor crack propagation resistance.…”

Section: Or Peer Reviewmentioning

confidence: 60%

OC, HPC, UHPC and UHPFRC Corrosion Performance in the Marine Environment

Lliso-Ferrando,

Gandía-Romero,

Soto

et al. 2023

Buildings

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This work aims to study the corrosion performance of six concretes in the marine environment: three ordinary concretes (C30, C40 and C50); one high-performance concrete (C90); two ultra high-performance concretes, one without fibres (C150-NF) and another one with steel fibres (C150-F). To this end, porosity and chloride ingress resistance were analysed at different ages. Resistivity was also evaluated and the corrosion rate in the embedded rebars was monitored. The results showed that C30, C40 and C50 had porosity accessible to water percentages and capillary absorption values between six- and eight-fold higher than C90 and C150-NF and C150-F, respectively. Similar differences were obtained when oxygen permeability was analysed. Chloride ingress resistance in the ordinary concretes was estimated to be one-fold lower than in C90 and two-fold lower than in C150-NF and C150-F. Presence of fibres in C150-F increased the diffusion coefficient between 5% and 50% compared to C150-NF. Fibres also affected resistivity: C150-NF had values above 5500 Ωm, but the C150-F and C90 values were between 700 and 1000 Ωm and were one-fold higher than the ordinary concretes. After 3 years, the corrosion damage in the embedded rebars exposed to a marine environment was negligible in C90, C150-NF and C150-F (9.5, 6.2 and 3.5 mg mass loss), but with higher values (between 170.4 and 328.9 mg) for C3, C40 and C50. The results allow a framework to be established to make comparisons in future studies.

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“…Slag powder is one of the most suitable SCMs for High-Performance Concretes to replace cement and enhance its mechanical properties [5]. The reactivity of SCMs in cement systems depends not only on the chemical composition, but also on their fineness [6,7]. The finer the slag particles, the more rounded they are, which significantly improves the workability of fresh concrete and the uniformity of the microstructure at a later stage.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrafine Slag Powder on the Rheological Behaviour, Compressive Strength, and Microstructure of Ultra-High Performance Concrete

Luan¹

2023

Ceramics - Silikaty

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The effect of the addition of ultrafine slag powder (USL) on the rheology, strength, and porosity of Ultra-High Performance Concrete (UHPC) was investigated, whose microstructure was analysed by XRD, NMR, XPS, and SEM. The results show that whether the USL was incorporated or not, the paste keeps its original shear thickening behaviour. However, the yield stress first increased and then decreased with the addition of the USL content. The change in the compressive strength of the UHPC kept close to that of the yield stress. Incorporating 20 % USL, the UHPC reached a maximum compressive strength of 147.8 MPa, which was increased by 12.2 % compared to the reference sample, and its porosity was 6.72 %, which was decreased by 14% compared to the reference sample. In addition to the formation of more C-S-H gels, the pozzolanic reaction of USL increased the chain length of C-S-H and the binding energy of Ca2p, Si2p, O1s, and Al2p. Furthermore, it reduced the Al/Si ratio and Ca2P-Si2P value, making the paste microstructure more compact.

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Changes in fractal dimension and durability of ultra-high performance concrete (UHPC) with silica fume content

Cited by 17 publications

References 63 publications

The Synergistic Effects of Ultrafine Slag Powder and Limestone on the Rheology Behavior, Microstructure, and Fractal Features of Ultra-High Performance Concrete (UHPC)

The Synergistic Effects of Ultrafine Slag Powder and Limestone on the Rheology Behavior, Microstructure, and Fractal Features of Ultra-High Performance Concrete (UHPC)

OC, HPC, UHPC and UHPFRC Corrosion Performance in the Marine Environment

Effect of Ultrafine Slag Powder on the Rheological Behaviour, Compressive Strength, and Microstructure of Ultra-High Performance Concrete

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