Study on the Workability and Mechanical Properties of Recycled Aggregate Concrete Containing Ultra-Fine Fly Ash

Li, Yi Jin; Zhou, Shengyuan; Yin, Jian; Li, Jun

doi:10.4028/www.scientific.net/kem.302-303.314

Cited by 3 publications

(3 citation statements)

References 6 publications

(4 reference statements)

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“…The pore volume of harmless pores smaller than 20nm in the concrete mixed with ultrafine fly ash with an average particle size of 4μm is significantly larger than that of the concrete mixed with other two ultrafine fly ash (2μm, 6μm). A.K.H.Kwan et al [8] studied the effect of mixing ultrafine fly ash into cement mortar by testing the filling density, fluidity and strength of ultrafine fly ash with content between 0 and 60%. The results showed that: Up to 40% of ultrafine fly ash can significantly increase the packing density of cementing materials.…”

Section: Effect Of Ultrafine Fly Ash On Working Performance Of Concretementioning

confidence: 99%

Review on the Role of Ultra-fine Fly Ash on the Performance of Concrete

Zhang

2023

JERR

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Fly ash is mainly the solid waste emitted by coal-fired fossil fuel power stations, which is collected through the flue gas emitted. At present, the comprehensive utilization of fly ash has been widely promoted and applied in actual production. The application of fly ash to concrete can not only improve the strength of concrete, but also save cement. However, its hydration rate is slow, and the incorporation of concrete will reduce the early strength of concrete. In order to improve the activity and other properties of fly ash, ultrafine fly ash with small particle size is obtained by grinding fly ash. Ultrafine fly ash has finer particle size than fly ash and larger spherical shape than original fly ash. Water demand decreases, density increases and activity increases. It can better fill the cement void, improve the internal compactness of concrete, and improve the interface structure of materials. Research has shown that adding 10% to 20% fly ash can achieve better performance than conventional concrete. For higher fly ash content, the strength decreases with the increase of fly ash content.

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Section: Effect Of Ultrafine Fly Ash On Working Performance Of Concretementioning

confidence: 99%

Review on the Role of Ultra-fine Fly Ash on the Performance of Concrete

Zhang

2023

JERR

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“…For example, Ca(OH) 2 is generated by the cement hydration is the reactive activator of fly ash which can reduce fluid alkalinity after hydration and make further hydration of unhydrated cement. Since the time of fly ash hydration reaction is slow, the high range water reducing agents on fly ash will not work in a short period of time, then can be gradually released with the fly ash hydration , so the loss of flesh fly ash concrete slump constant is low [8].…”

Section: Influence Mechanismmentioning

confidence: 99%

Basic Mechanics Properties Test of Fly Ash Concrete

Xie

Zhang

2012

AMM

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By the test study of basic mechanics properties of concrete with different fly ash content, the influence of the content of fly ash on the compressive strength, flexural strength, splitting tensile strength and static compressive elastic modulus of concrete are analyzed with the explaining of the influence mechanism of fly ash. The test results show that, comparing with the normal reference concrete, the early age strength of fly ash concrete enhances slowly, while the late strength develops rapidly, even overpasses the strength of normal reference concrete.

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“…Utilization of waste concrete from cement concrete pavement heavy repair is major research subject of home and abroad scholar [1][2][3] . There are much more research on recycled aggregate as cement-bound crushed stones base materials.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Mineral Admixtures on the Wear-Resisting Property of Recycled Aggregate Concrete

Chen¹,

Yin

Song

et al. 2013

AMR

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It was tested the strength and wear value of recycled aggregate concrete mixing fly ash, slag, silica fume and double-mixture or three-mixture in deferent age. The results show that the wear value of recycled aggregate concrete mixing 30% fly ash is more than reference concrete at 3days, but can improve final wear-resisting property significantly. The wear value of recycled aggregate concrete mixing 30% double-mixture of fly ash and silica fume is much lower than reference concrete at 3days, and improve early wear-resisting property significantly. The flexural strength of the concrete is 4.26MPa at 3days, which can satisfy the traffic requirement. The wear value of recycled aggregate concrete mixing 30% three-mixture of fly ash, slag and silica fume is lower than reference concrete at 3days, but the declining rate is not significant. It investigates mechanics of double-mixture technique which improves wear-resisting property at the same time.

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Study on the Workability and Mechanical Properties of Recycled Aggregate Concrete Containing Ultra-Fine Fly Ash

Cited by 3 publications

References 6 publications

Review on the Role of Ultra-fine Fly Ash on the Performance of Concrete

Review on the Role of Ultra-fine Fly Ash on the Performance of Concrete

Basic Mechanics Properties Test of Fly Ash Concrete

The Influence of Mineral Admixtures on the Wear-Resisting Property of Recycled Aggregate Concrete

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