Pullout behavior of steel fibers with different shapes from ultra-high performance concrete (UHPC) prepared with granite powder under different curing conditions

Zhang, Hongru; Ji, Tao; Lin, Xiaoying

doi:10.1016/j.conbuildmat.2019.03.274

Cited by 76 publications

(13 citation statements)

References 31 publications

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“…This fact is also supported by the performed study in Ref. 18 showed that GP improves the concrete pore structure. The experimentally observed data also demonstrate that the addition of GP making the distribution of hydration products to be more uniform and the overall density of the specimens in group G1 be better than that of group C. At the same time, there is more petite CH crystal in the hydration products.…”

Section: Mechanical Properties and Microstructuresupporting

confidence: 65%

Enhancement of concrete performance via mixed limestone and granite powders

Zeng

Zhang

2021

Preprint

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The granite and limestone powders are commonly exploited as a replacement for cement; however, the effects of different mixing dosages of them on the mechanical properties and durability of concrete have not been scrutinized carefully. Under different environmental conditions, the compressive strength of the specimens is measured using cube compressive, splitting tensile, freeze-thaw cycles, and sulfate immersion tests. The phase composition of hydration products and microstructure is evaluated by SEM scanning analysis. The results indicate that the composite mixture of granite and limestone powders shows a complementary synergistic effect and improves the mechanical properties, freeze-thaw resistance, and sulfate erosion resistance of the concrete. The best values for the mechanical properties and freeze-thaw resistance are obtained when the dosages of granite and limestone powders in order are 10% and 5%. For the case of granite and limestone powders equal to 10% and 15%, respectively, the best sulfate erosion resistance is reported.

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Section: Mechanical Properties and Microstructuresupporting

confidence: 65%

Enhancement of concrete performance via mixed limestone and granite powders

Zeng

Zhang

2021

Preprint

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“…재료의 부피대비 2%의 강섬유를 혼입하였을 때 가장 최적의 역학적 성능을 발휘하 는 것으로 알려져 있으며, 혼입된 섬유의 가교효과로 인해 균열이 국소화 되는 것을 억제하여 섬유보강 고성능콘크리 트(Ultra high performance fiber reinforced concrete)는 다수 의 균열을 생성하며, 결과적으로 UHPFRC는 변형률 경화 거동을 갖는다. 또한 연구자들은 UHPFRC의 보다 높은 성능 향상을 위하여 hooked end 섬유, twisted 섬유와 같은 다양한 변형 섬유를 사용하고자 하였다 (Tai et al, 2016;Tai and El-Tawil, 2017;Zhang et al, 2019) (You et al, 2019;You et al, 2021). 이러한 폐유리 분말의 사용을 위해 다수의 연구자들은 실리카 퓸, 충전재 혹은 잔골재 등을 치환하는 연구를 수행했다 (Vaitkevičius et al, 2014;Soliman and Tagnit-Hamou, 2017a;Soliman and Tagnit-Hamou, 2017b;Wilson et al, 2019)…”

Section: 서 론unclassified

Modification of UHPC Matrix and Fiber Surface for Improving the Mechanical Performance of Ultra-High-Performance Fiber-Reinforced Concrete

Oh¹,

Kim²,

Lee³

et al. 2023

J. Korean Soc. Hazard Mitig

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In this study, filler and silica fume were substituted by Liquid crystal display glass powder (LCDGP) and nanosilica, respectively, to improve the performance of ultra-high- performance fiber-reinforced concrete. In addition, the surface of steel fiber was modified with ethylenediaminetetraacetic acid (EDTA) solution to improve the interfacial friction between the fiber and Ultra-high-performanceconcrete (UHPC) matrix. Both LCDGP and nanosilica reacted with calcium hydroxide to form hydrates, and the fiber surface roughness increased owing to the EDTA treatment. When LCDGP was used, the compressive strength decreased owing to a decrease in packing density; however, the compressive and tensile strengths of Ultra-high-performance fiber-reinforced-concrete (UHPFRC) were improved on using nanosilica. It was observed that the surface modification of the fiber increased the friction force between the UHPC and fiber interface; therefore, it was more effective in improving the tensile strength than the compressive strength.

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“…Thus, it can meet the high-performance requirements of engineering structures in various severe environments [ 40 , 41 , 42 , 43 , 44 ]. In recent years, many researchers [ 32 , 45 , 46 , 47 ] have reported the development of UHPC and evaluated its mechanical and durability performance. However, studies on radiation-proof UHPC are few and remain in the initial stages [ 48 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Comprehensive Properties of a High-Radiation-Shielding UHPC by Using Magnetite Fine Aggregate

Han

et al. 2022

Materials

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Nuclear technology benefits humans, but it also produces nuclear radiation that harms human health and the environment. Based on the modified Andreasen and Andersen particle packing model for achieving a densely compacted cementitious matrix, a new magnetite ultra-high-performance concrete (MUHPC) was designed using magnetite fine aggregate as a substitute for river sands with 0%, 20%, 40%, 60%, 80%, and 100% replacement ratios. The comprehensive properties of the developed MUHPC were tested and evaluated. These properties were fluidity, static and dynamic compressive strengths, high-temperature performance, antiradiation behaviors, hydration products, and micropore structures. Experimental results indicate that the developed MUHPC has high work performance and static and dynamic mechanical properties. The gamma ray shielding performance of MUHPC substantially improves with increased magnetite fine aggregate. Corresponding with 100% magnetite fine aggregate substitution, the linear attenuation coefficient of MUHPC is enhanced by 56.8% compared with that of ordinary concrete. Magnetite addition does not change the type of cement hydration products but improves the micropore structures of MUHPC and effectively reduces its total porosity and average pore diameter, thereby contributing to its mechanical and radiation shielding properties. The compressive strength and linear attenuation coefficient of the MUHPC can reach 150 MPa and 0.2 cm−1, respectively. In addition, the MUHPC also exhibits superior mechanical and radiation shielding performance at elevated temperatures (<400 °C). Finally, high strength and antiradiation performance support the use of MUHPC in radiation protection materials in the future.

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Pullout behavior of steel fibers with different shapes from ultra-high performance concrete (UHPC) prepared with granite powder under different curing conditions

Cited by 76 publications

References 31 publications

Enhancement of concrete performance via mixed limestone and granite powders

Enhancement of concrete performance via mixed limestone and granite powders

Modification of UHPC Matrix and Fiber Surface for Improving the Mechanical Performance of Ultra-High-Performance Fiber-Reinforced Concrete

Preparation and Comprehensive Properties of a High-Radiation-Shielding UHPC by Using Magnetite Fine Aggregate

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