Performance of glass-blended cement produced by intergrinding and separate grinding methods

You, Ilhwan; Yoo, Doo Yeol; Doh, Jeung‐Hwan; Zi, Goangseup

doi:10.1016/j.cemconcomp.2021.103937

Cited by 12 publications

(2 citation statements)

References 71 publications

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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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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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“…Therefore, substitution of partial RS by alternative materials in concrete production was advocated in order to slow down the consumption of natural RS. Some RS substitutes were proposed previously, such as dune sand, 2,3 sea sand, 4,5 recycled glass, [6][7][8] steel slag sand, [9][10][11] and manufactured sand (MS). [12][13][14][15][16] Among these substitutes, MS is the most convenient and yet efficient replacement since it is made by mechanical crushing of virgin rock or construction waste.…”

Section: Introductionmentioning

confidence: 99%

Effect of concrete wet packing density on the uni‐axial strength of manufactured sand CFST columns

Lai

et al. 2022

Structural Concrete

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River sand (RS) has been the most popular fine aggregate in concrete production. Recently, because of the continuing decline in supply of RS, alternative source of fine aggregates is needed. Manufactured sand (MS), which is produced by mechanical crushing of virgin rock or construction waste, is becoming more popular for replacing RS. Concrete containing MS has higher compressive strength but is more brittle. To promote the application of MS in concrete, concrete‐filled‐steel‐tube (CFST) column is advocated to restore the ductility by composite action. It is believed that the improved strength and ductility of CFST column containing MS is due to the enhanced wet packing density (WPD) of concrete, which has been researched to affect significantly the mechanical performance of concrete. Nonetheless, there was very limited research carried out on the effect of WPD on the behavior of confined concrete and CFST column. Ergo, 15 CFST column specimens with MS replacing RS partially or totally were prepared and tested under uni‐axial compression. It is evident that CFST specimens with concrete containing blended fine aggregates showed different axial load‐strain behavior to those with RS concrete (especially the maximum strength and postelastic slope). More importantly, the normalized strength (maximum strength to squash load) of CFST specimens can be correlated positively to the WPD. This article thus provides a new insight into the interdependence between the uni‐axial strength of CFST columns and the WPD of the in‐filled concrete.

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Investigation of different ways of activation of fly ash–cement mixtures: part 2—mechanical activation

Wilińska,

Pacewska,

Ostrowski

2023

J Therm Anal Calorim

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Introducing supplementary cementitious materials (SCM), e.g. fly ash, into cement composite results in ecological benefits. However, in the case of high amount of SCM used as a replacement of a part of cement, there are problems related to the development of the desired properties of the final composite. Such mixtures often require activation. In the first part of this series of publications, the results of chemical activation (using Na2SO4 and Ca(OH)2) of a mixture with a very high content of fly ash were discussed. The aim of this work was to investigate the influence of mechanical activation on hydration and microstructure of the binder composed of 80% of fly ash and 20% of cement. Mechanical activation was performed using a planetary ball mill. The following instrumental methods were used to investigate the activated fly ash-cement pastes: calorimetry, TG/DTG, FTIR spectroscopy, X-ray diffraction and scanning electron microscopy (SEM) coupled with EDS. It was shown that concomitant grinding of cement and fly ash is more effective compared to separate grinding. Mechanism of hydration/activation of such mixtures was discussed in detail.

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Performance of glass-blended cement produced by intergrinding and separate grinding methods

Cited by 12 publications

References 71 publications

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

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

Effect of concrete wet packing density on the uni‐axial strength of manufactured sand CFST columns

Investigation of different ways of activation of fly ash–cement mixtures: part 2—mechanical activation

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