Strength and Durability of High Performance Road Concrete Containing Ultra-Fine Fly Ash

Li, Yi Jin; Gong, Yun Li; Yin, Jian

doi:10.4028/www.scientific.net/amm.99-100.1264

Cited by 3 publications

(4 citation statements)

References 1 publication

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“…In addition, the incorporation of steel fibers could inhibit propagation of cracking [69]. After 600 freeze-thaw cycles, the durability coefficient of UHPC was larger than or equal to 100, and the mass loss was almost zero [68]. After 1000 freeze-thaw cycles, the relative dynamic modulus of regular concrete (RC), high strength mortar (HSM) and reactive powder concrete (RPC) reduced by 61%, 22% and 10% respectively; their compressive strengths reduced by 57%, 16% and 6% respectively, as shown in Fig.…”

Section: Freezing-thawing Resistancementioning

confidence: 95%

See 1 more Smart Citation

A review on ultra high performance concrete: Part II. Hydration, microstructure and properties

Wang

Shi

et al. 2015

Construction and Building Materials

662

169

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Section: Freezing-thawing Resistancementioning

confidence: 95%

“…Other study [15] found that the carbonation could not happen on UHPC, no matter after sealed, standard and heat-curing condition. Another one found that the 28-d mean depth of the carbonation of UHPC was less than 0.30 mm [68].…”

Section: Carbonation Resistancementioning

confidence: 98%

A review on ultra high performance concrete: Part II. Hydration, microstructure and properties

Wang

Shi

et al. 2015

Construction and Building Materials

662

169

View full text Add to dashboard Cite

“…Finally, it can lead to undesirable air entrainment behavior and mixture segregation [ 31 , 32 ]. The durability of high-performance road concrete incorporating coal fly ash was investigated by Li et al, who found that the use of coal fly ash as a cement replacement could significantly improve the permeability resistance and freezing–thawing resistance of concrete [ 33 ]. Furthermore, Miguel et al found that coal fly ash and silica fume improved the durability of mortar and concrete dramatically by effectively inhibiting the alkali–silica reaction [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nano Silica Particles on Impact Resistance and Durability of Concrete Containing Coal Fly Ash

Zhang

Sha

et al. 2021

Nanomaterials

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In this study, the effect of adding nano-silica (NS) particles on the properties of concrete containing coal fly ash were explored, including the mechanical properties, impact resistance, chloride penetration resistance, and freezing–thawing resistance. The NS particles were added into the concrete at 1%, 2%, 3%, 4%, and 5% of the binder weight. The behavior under an impact load was measured using a drop weight impact method, and the number of blows and impact energy difference was used to assess the impact resistance of the specimens. The durability of the concrete includes its chloride penetration and freezing–thawing resistance; these were calculated based on the chloride diffusion coefficient and relative dynamic elastic modulus (RDEM) of the samples after the freezing–thawing cycles, respectively. The experimental results showed that the addition of NS can considerably improve the mechanical properties of concrete, along with its freezing–thawing resistance and chloride penetration resistance. When NS particles were added at different replacement levels, the compressive, flexural, and splitting tensile strengths of the specimens were increased by 15.5%, 27.3%, and 19%, respectively, as compared with a control concrete. The addition of NS enhanced the impact resistance of the concrete, although the brittleness characteristics of the concrete did not change. When the content of the NS particles was 2%, the number of first crack impacts reached a maximum of 37, 23.3% higher compared with the control concrete. Simultaneously, the chloride penetration resistance and freezing–thawing resistance of the samples increased dramatically. The optimal level of cement replacement by NS in concrete for achieving the best impact resistance and durability was 2–3 wt%. It was found that when the percentage of the NS in the cement paste was excessively high, the improvement from adding NS to the properties of the concrete were reduced, and could even lead to negative impacts on the impact resistance and durability of the concrete.

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“…Until now, applications of UHPC in many countries have been reported [18] [19] [20].The enhanced mechanical properties and durability of UHPC also has been widely reported [ 21 ] [ 22 ][ 23 ] [ 24 ]. But there is still a lack of systematic microstructure analysis and mechanical property investigation of UHPC.…”

Section: Introductionmentioning

confidence: 99%

Experimental studies and microstructure analysis for ultra high-performance reactive powder concrete

Chen

Wan

Jin

et al. 2019

Construction and Building Materials

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In this paper, the strengthening mechanism of curing temperature, fine aggregate gradation, reactive materials, water reducer type, dosage and types of fibers on the microstructures and mechanical properties of Ultra-high-Performance Concrete (UHPC) was analyzed in detail by means of microstructure analysis using Scanning Electron Microscope (SEM) and mechanical tests. Based on the mechanical tests and analysis of the microstructure, a new optimal mix proportion of UHPC was also developed by considering the economic benefits. It is found that the gradation of UHPC fine aggregate can achieve the densest stacking state gradation after the optimization of mix proportion. Gradation Optimization promotes UHPC to be hydrated step by step. A large amount of hydrated calcium silicate (C-S-H) gel and a small amount of crystal produced in the early hydration phase together form the original structure of the concrete. The initial hydration products consume a large amount of Ca (OH) 2 to produce C-S-H and other cementitious substances by so called Secondary Hydration Reaction, the C-S-H can further catalyst hydration. It is also found that the low water-cement ratio can reduce porosity and improve the compactness and compressive strength of UHPC microstructure. The fibers can effectively delay the appearance and development of micro-cracks in the concrete matrix, help to improve the toughness, ductility and flexural properties of UHPC, and avoid brittle failure. High temperature curing is beneficial to the formation of cementitious substances with lower calcium-silicate ratio (C/S) and catalyst the occurrence of secondary hydration reaction.

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Strength and Durability of High Performance Road Concrete Containing Ultra-Fine Fly Ash

Cited by 3 publications

References 1 publication

A review on ultra high performance concrete: Part II. Hydration, microstructure and properties

A review on ultra high performance concrete: Part II. Hydration, microstructure and properties

Effect of Nano Silica Particles on Impact Resistance and Durability of Concrete Containing Coal Fly Ash

Experimental studies and microstructure analysis for ultra high-performance reactive powder concrete

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