Shrinkage characteristics of high-strength concrete for large underground space structures

Min, Ki Ha; Jung, Hyung Chul; Yang, Jun Mo; Yoon, Young Soo

doi:10.1016/j.tust.2009.09.007

Cited by 14 publications

(2 citation statements)

References 9 publications

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“…Compared to conventional concrete, high-strength concrete (HSC) develops higher compressive strength along with improved durability, ductility, and high elastic modulus that have recently promoted its extended application to many structures [1][2][3]. For example, Min et al [4] investigated the shrinkage characteristics of high-strength concrete for large underground space structures to explore what ingredient in the mixture affected these characteristics. Ho et al [5] evaluated analytically the effectiveness of adding confinement for ductility improvement of HSC columns.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Experimental Study on the Flexural Behavior of High‐Strength Fiber‐Reinforced Concrete and High‐Strength Concrete Beams

Yang

Joh

Kim

2018

Advances in Materials Science and Engineering

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The flexural responses of high-strength fiber-reinforced concrete (HSFRC) beams and high-strength concrete (HSC) beams are compared in this study. A series of HSFRC and HSC beams were tested under pure flexural loading. The effects of the type of concrete, compressive strength of the concrete, and tensile rebar ratio on the flexural behavior of the concrete beams were investigated. The flexural behavior of the HSFRC and HSC beams including the induced crack and failure patterns, load and deflection capacity, crack stiffness, ductility index, and flexural toughness was compared. The crack stiffness of the HSC and HSFRC beams increased with the rebar ratio. For the same rebar ratios, the crack stiffness of the HSFRC beams was much greater than that of the HSC beams. The ductility index of the HSC beams decreased sharply with an increase in the rebar ratio, but the ductility index of the HSFRC beams did not show a clear decrease with increasing rebar ratio. The flexural toughness of the HSFRC beams was greater than that of the HSC beams at higher rebar ratios of 1.47% and 1.97%, indicating that the energy absorption of the HSFRC beams was greater than that of the HSC beams. Test results also indicated that HSFRC developed better and more consistent ductility with higher rebar ratio. In addition, the tested bending strength and sectional analysis results were compared.

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Section: Introductionmentioning

confidence: 99%

A Comparative Experimental Study on the Flexural Behavior of High‐Strength Fiber‐Reinforced Concrete and High‐Strength Concrete Beams

Yang

Joh

Kim

2018

Advances in Materials Science and Engineering

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“…Yüksek performanslı betonlarda düşük su/bağlayıcı oranı özellikle bünyesel büzülmeyi risk haline getirmektedir [2,3]. Yüksek hidratasyon ısısı ve kapiler su kaçışları bu etkiyi tetiklemektedir [4]. Kuruma büzülmesinin 0,30 su / bağlayıcı oranı altındaki betonlarda büyük bir risk yaratmayacağı gibi bir yargı literatüre bakıldığında ilk etapta dikkati çekebilir [5].…”

Section: Gi̇ri̇ş (Introduction)unclassified

Erken yaş büzülme çatlaklarının lif içeren/içermeyen ultra yüksek performanslı betona gömülü donatı korozyonuna etkisi

Erten¹,

Yalçınkaya²,

Beglarigale³

et al. 2017

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Bu çalışmada, iki farklı başlangıç ortamında bekletilmiş lif içeren ve içermeyen ultra yüksek performanslı beton (UYPB) karışımlarının erken yaş (ilk 24 saat) büzülme özellikleri incelenmiştir. Erken yaşta oldukça yüksek mertebelerde büzülme gösteren karışımların kısıtlanmış halde bekletilmesi halinde oluşan çatlakların çelik donatının korozyon gelişimine etkisi deneysel olarak belirlenmiştir. Kısıtlanmış büzülme çatlaklarının çelik donatı korozyonu üzerinde bazı olumsuz etkiler yarattığı tespit edilmiştir. Ancak düşük su/bağlayıcı oranlı UYPB örneklerinin yüzeyinde çatlak oluşmasına rağmen, donatıyı korumada oldukça iyi performans gösterdiği görülmüştür. UYPB'nin en önemli özelliği, geçirimsiz yapısı nedeniyle sağladığı üstün durabilite (kalıcılık) özelliğidir. UYPB'nin kalıcılık özelliklerinin korunması için erken yaş çatlaklarının önlenmesi amacıyla gerekli önlemler alınmalıdır. Çalışma kapsamında yapılan analizler, uçucu kül ikamesinin ve mikro çelik lif takviyesinin çatlak oluşumunu azaltarak donatı korozyonuna karşı korumayı geliştirdiğini göstermiştir. In this study, early age (first 24 hours) shrinkage properties of Ultra High Performance Concrete (UHPC) mixtures with and without fibers, exposed to two different initial curing conditions, were investigated. The effect of early age shrinkage cracks on development of corrosion of steel reinforcement embedded in UHPC has been determined experimentally. Some negative effects of restrained shrinkage cracks on corrosion of embedded steel reinforcement were determined. In spite of the cracks formation on the surface of UHPC specimens with low water to binder ratio, the UHPC mixtures showed generally good performance in terms of the protection of rebar against corrosion. Although cracks formed on surfaces of impermeable UHPC mixtures, which consist of low water to binder ratio, UHPC showed generally good performance on the protection of steel corrosion. The most important characteristic of UHPC is superior durability due to its impermeable nature. In order to maintain the durability properties of UHPC, necessary precautions should be taken to prevent early age cracks. The analysis conducted in this study revealed that fly ash replacement and micro steel fiber reinforcement enhanced protection against corrosion of rebars by means of reducing crack formation.

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Experimental study on the influence of content and fineness of fly ash on the mechanical properties of grouting slurries

Jiang,

Zhang,

Zhang

et al. 2024

Deep Underground Science and Engineering

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Excavation gaps around the front shield can be generated during shield construction, resulting in significant ground settlement. Traditional synchronous grouting slurries are unsuitable for filling these gaps during tunneling under existing subway lines. To address this issue, experiments are conducted on mix characteristics and hardening properties of slurries with variations in fineness and contents of fly ash. The experimental and computed tomography scan results yield the following findings: (1) fly ash with high fineness can effectively reduce the early strength of slurries and enhance their injectability. This improves the filling effect on micropores in the slurry and ultimately enhances the final hardening strength. (2) Fineness of fly ash controls the process of slurry hydration. The higher the fineness of fly ash, the more visible the exothermic hydration of slurry and the earlier the highest temperature peak appears. (3) Fly ash with high fineness can effectively increase the density and consolidation rate of slurries, resulting in greater improvement in slurry strength, particularly when the ratio of fly ash to cement (mf/mc) is 0.75. (4) Fly ash with high fineness can effectively decrease the likelihood of appearance of pores in the slurry, optimize the pore structure, and enhance the strength of slurries after consolidation.

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Shrinkage characteristics of high-strength concrete for large underground space structures

Cited by 14 publications

References 9 publications

A Comparative Experimental Study on the Flexural Behavior of High‐Strength Fiber‐Reinforced Concrete and High‐Strength Concrete Beams

A Comparative Experimental Study on the Flexural Behavior of High‐Strength Fiber‐Reinforced Concrete and High‐Strength Concrete Beams

Erken yaş büzülme çatlaklarının lif içeren/içermeyen ultra yüksek performanslı betona gömülü donatı korozyonuna etkisi

Experimental study on the influence of content and fineness of fly ash on the mechanical properties of grouting slurries

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