The effect of curing regimes on the mechanical properties, nano-mechanical properties and microstructure of ultra-high performance concrete

Shen, Peiliang; Lü, Linnü; He, Yongjia; Wang, Fazhou; Hu, Shuguang

doi:10.1016/j.cemconres.2019.01.004

Cited by 170 publications

(33 citation statements)

References 66 publications

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“…The UHPC not only has high strength and toughness but also has high durability, which has been successfully applied to bridge engineering. The transition zone between the binder and the aggregate interface (ITZ) is a weak link inside the UHPC, and some studies have tried to improve it by adjusting the mix ratio and curing method (Zhao et al 2019f;Shen et al 2019a;Raheem et al 2019). UHPCs are often costly, and mineral admixtures were added to UHPC to reduce the costs but improve the performance in some studies.…”

Section: High-performance Concrete Materialsmentioning

confidence: 99%

Review of annual progress of bridge engineering in 2019

Zhao

Yuan

Wei

et al. 2020

ABEN

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Bridge construction is one of the cores of traffic infrastructure construction. To better develop relevant bridge science, this paper introduces the main research progress in China and abroad in 2019 from 13 aspects, including concrete bridges and the high-performance materials, the latest research on steel-concrete composite girders, advances in box girder and cable-supported bridge analysis theories, advance in steel bridges, the theory of bridge evaluation and reinforcement, bridge model tests and new testing techniques, steel bridge fatigue, wind resistance of bridges, vehicle-bridge interactions, progress in seismic design of bridges, bridge hydrodynamics, bridge informatization and intelligent bridge and prefabricated concrete bridge structures.

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Section: High-performance Concrete Materialsmentioning

confidence: 99%

Review of annual progress of bridge engineering in 2019

Zhao

Yuan

Wei

et al. 2020

ABEN

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“…The curing temperature has a significant effect on the mechanical properties of concrete, which can affect the cement hydration and pozzolanic effect of supplementary materials, further influencing the formation of calcium silica hydrate (C–S–H) and the evolution of the microstructure of concrete. Heat treatments have generally been used for UHPC preparation to accelerate the cement hydration and pozzolanic effect of mineral admixtures for improving the strength, density, and microstructure [ 29 , 30 , 31 ]. However, the heat treatment is limited when cast in place, while the temperature and the moisture are difficult to control at a construction site.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, it is important to study the effect of curing regimes on the mechanical properties, hydration, and microstructure development of UHPC. Yazici et al [ 32 ] and Shen et al [ 30 ] reported that the compressive strength was significantly improved after steam and autoclaving, while the flexural strength and toughness were decreased. Wu et al [ 25 ] reported that GGBS or fly ash has a limited effect on the compressive strength of UHPC under standard curing, while the compressive strength decreased with the increase in GGBS and fly ash content under hot water and steam curing.…”

Section: Introductionmentioning

confidence: 99%

Effect of Curing Regime on the Mechanical Strength, Hydration, and Microstructure of Ecological Ultrahigh-Performance Concrete (EUHPC)

Zuo

Zhang

et al. 2022

Materials

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This paper investigates the effect of curing regimes (standard and steam curing) on the mechanical strength, hydration, and microstructure of ecological ultrahigh-performance concrete (EUHPC). The flowability, compressive strength, flexural strength, hydration, porosity, pore size distribution, and microstructure of UHPC with different contents of supplementary materials (silica fume, fly ash, and ground granulated blast furnace slag) were assessed. The test results showed that the compressive strength of EUHPC under steam curing was increased considerably compared to that under standard curing, while the flexural strength was mildly decreased. The steam curing could decrease the porosity of EUHPC, which ranged between 7% and 9% for standard curing, and between 3.5% and 5% for steam curing. The aperture of EUHPC was below 20 nm, mainly located in the range of 10 nm to 20 nm under standard curing, while it was less than 10 nm for steam curing. C–S–H gel was produced under steam curing, while unhydrated fly ash, mineral powder, and Ca(OH)2 crystal were observed in the amorphous C–S–H gel. The microstructure of EUHPC under steam curing was denser than that under standard curing, and the interfacial transition zones under both curing regimes were compact.

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“…Benzer şekilde, Shen vd. [44], hacimsel olarak %2,0 düz çelik lif içeren prizma numuneler üzerinde yaptıkları testler sonucunda, buhar kürü ve otoklav kürünün standart su kürüne göre basınç dayanımlarını belirgin bir şekilde arttırdığı belirlenmiştir. Park vd.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Feasibility of use of glass powder and/or ground granulated blast furnace slag in place of cement in ultra high performance concrete

Hasgül

BIÇAKÇIOĞLU

2022

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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 Reducing the amount of cement in UHPC mixture is feasible with the partial uses of GP and/or GGBFS.  The compressive strengths of 28 and 56 day of UHPC increased with 12.5% GGBFS use.  The impacts of GP and GGBFS on compressive strength are more apparent with the steel fiber and steam curing Ultra High Performance Concrete (UHPC) is a new generation concrete type having very high concrete compressive strength, post-cracking tensile behavior, durability and mechanical properties. The amount of cement used in the UHPC is higher than conventional normal strength concrete. In recent years, some additive materials such as, glass powder (GP), ground granulated blast furnace slag (GGBFS) or fly ash can be used to reduce the negative effects of cement due to high cost, environmental effects and shrinkage. These materials fill voids between the cement particles, resulting a less permeable concrete. These materials react chemically with steam or pressure curing due to their pozzolanic properties. Thus, they exhibit binding agent and hence, have significant potential to improve the mechanical properties of concrete. Figure A. The impacts of GP and GGBFS uses on concrete compressive strengthPurpose: In the study, the feasibility of GP and / or GGBFS uses in place of the cement in the UHPC content has been investigated in terms of concrete compressive strength. However, the effects of these additives on the compressive strength were investigated for the cases of steel fiber inclusion and / or steam curing application. Theory and Methods:The total of 16 UHPC mixtures with single, double and triple binder systems were produced by the independence and dual-uses of GP and GGBFS of 12.5% and 25% by volume as well as additive-free control mixture. The compressive strengths of cube specimens for each mixture were determined for 7, 14, 28, 56 and 90 days by considering with and without steel fiber and steam curing. Results:The test results showed that while the compressive strengths were decreasing trend at all concrete ages as the GP amount increases, relative differences were very small at 28 day and beyond. While the compressive strength of UHPC mixture containing the GGBFS of 12.5% increased at the concrete ages of 28 and 56 day, the strength decreased for the ratio of 25%. However, the compressive strengths showed a slightly decreasing trend for the dual-uses of GP and GGBFS in the mixture. Conclusion:It can be deduced that the target compressive strengths of UHPC can be obtained with the partial uses of GP and/or GGBFS by reducing the amount of cement in the mixture in order to obtain eco-friendlier and more economical concrete. Noted that the effects of these additive materials on the compressive strength become more apparent with the inclusion of steel fiber to the UHPC mixture and steam curing application.

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The effect of curing regimes on the mechanical properties, nano-mechanical properties and microstructure of ultra-high performance concrete

Cited by 170 publications

References 66 publications

Review of annual progress of bridge engineering in 2019

Review of annual progress of bridge engineering in 2019

Effect of Curing Regime on the Mechanical Strength, Hydration, and Microstructure of Ecological Ultrahigh-Performance Concrete (EUHPC)

Feasibility of use of glass powder and/or ground granulated blast furnace slag in place of cement in ultra high performance concrete

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