Effects of steel fibre and silica fume on impact behaviour of recycled aggregate concrete

Nazarimofrad, Ebrahim; Shaikh, Faiz Uddin Ahmed; Nili, Mahmoud

doi:10.1080/21650373.2016.1230900

Cited by 53 publications

(30 citation statements)

References 25 publications

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“…This can be attributed to the inferior properties of RCA due to its high water absorption (Table ) and weak bond between RCA and the cement matrix. Similar reduction in the compressive strength due to addition of RCA is also observed by others, for example, authors of References . The effect of 2 wt% NS in direct mixing and presoaking of RCA in NS solution on the compressive strength of recycled aggregate concrete can also be seen in Figure .…”

Section: Resultssupporting

confidence: 83%

Effect of mixing methods of nano silica on properties of recycled aggregate concrete

Shaikh

Chavda

Minhaj

et al. 2017

Structural Concrete

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The effect of presoaking of recycled coarse aggregate (RCA) in nano silica (NS) solution on the properties of recycled aggregates concrete is compared with the direct mixing of NS in concrete. In this study, four series of concrete are considered. The first and second series are control series containing 100% natural coarse aggregate (NCA) and 100% RCA, respectively. The third and fourth series are similar to the second series in every aspect except that 2 wt% NS is added through direct mixing in concrete and presoaking of RCA in 2 wt% NS solution of 24 hr, respectively. Results show that the measured 28-day compressive strength of recycled aggregate concrete containing presoaked RCA is higher than that containing direct mixing of NS in concrete. The volume of permeable voids, water sorptivity, and chloride ion penetration measured after 28 days curing is also reduced in recycled aggregate concrete containing presoaked RCA in NS solution than that containing direct mixing of NS in concrete. The total porosity of mortar adjacent to presoaked RCA is also found to be significantly lower than the same, where NS is mixed directly. The concentration of pores in the matrix adjacent to presoaked RCA is also shifted to medium capillary pores from the large capillary pores of matrix adjacent to RCA containing no NS. The volume of medium capillary pores reduced significantly in the matrix adjacent to presoaked RCA compared to the same, where NS is mixed directly. The scanning electron microscopic image analysis also supports this observation.

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Section: Resultssupporting

confidence: 83%

Effect of mixing methods of nano silica on properties of recycled aggregate concrete

Shaikh

Chavda

Minhaj

et al. 2017

Structural Concrete

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“…In seven studies, the loss due to 100% replacement of NA with RA was lower than 13.3% and in the remaining four, loss was higher than 13.3%. Highest STS loss was observed in those studies [ 9 , 66 , 70 ] investigating mixes with high aggregate-to-binder ratio, whereas, like the present study, low strength loss was observed in studies [ 13 , 14 , 67 , 68 , 69 ] having low aggregate-to-binder ratio.…”

Section: Resultscontrasting

confidence: 52%

“… Trends in CS loss due to 100% replacement of coarse NA with RA independent of strength class of concrete (20–85 MPa) reported in the past studies (data from [ 9 , 10 , 11 , 13 , 14 , 62 , 63 , 66 , 67 , 68 , 69 ]). …”

Section: Figurementioning

confidence: 93%

Enhancing the Hardened Properties of Recycled Concrete (RC) through Synergistic Incorporation of Fiber Reinforcement and Silica Fume

Ali

Ahmed

Qureshi³

et al. 2020

Materials

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Portland cement concrete is fragile in tension and it has numerous negative impacts on the environment. To deal with these issues, both fiber reinforcement and recycled materials can be utilized to manufacture sustainable and ductile concrete. In this study, the synergistic effects of high-performance mineral admixture silica fume and glass fiber reinforcement were investigated on the hardened properties of RC. For this purpose, two concrete mix families, namely, NC and RC were prepared. To understand the benefits of synergistic utilization of glass fiber and silica fume, in both NC and RC, 0.5% glass fiber was incorporated with three different levels of silica fume. i.e., 0%, 5%, and 10%. Both strength and permeability-related durability properties were investigated. Results revealed that combined incorporation of 0.5% fiber and 10% silica fume can help in the production of RC having better mechanical and durability performance compared to reference “NC”. Simultaneous incorporation of silica fume and glass fiber produces a combined effect greater than their individual effects on both mechanical and permeability properties of concrete. Silica fume plays a very dominant and positive role in the development of CS, WA, and CIPR of RC, whereas glass fiber plays a vital role in upgrading STS and FS of RC and whereas, with the addition of 0.5% glass fiber, RC can yield 8–9 times higher flexural toughness than that of the plain NC.

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“…There are also researchers who have worked to improve the properties of this type of concrete through the addition of pozzolan materials [38][39][40]. There are other studies that investigated the effect of adding pozzolan materials and steel fibers on the behavior of concrete containing recycled aggregates [41][42].…”

Section: Recycled Aggregate Concretementioning

confidence: 99%

Mechanical Properties of Recycled Aggregate Concrete With Steel Fiber: A Review

Al-Luhybi

2019

Tikrit j. eng. sci.

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In the building process, the recycling of aggregates arising from building and demolition debris is one of the best alternatives to maintain the environment and the areas needed to bury these debris. It also helps to preserve natural concrete sources from depletion efficiently. The use of recycled aggregates in new concrete manufacturing, however, leads to a decrease in concrete\\\’s strength characteristics. This reduction rises with the rise in the percentage of recycled aggregates used in concrete, which has caused many researchers to undertake many researches on how to enhance the characteristics of recycled aggregate-containing concrete. This paper presents several studies that examined the effect of adding steel fiber to improve the properties of concrete containing a coarse recycled aggregate.

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Effects of steel fibre and silica fume on impact behaviour of recycled aggregate concrete

Cited by 53 publications

References 25 publications

Effect of mixing methods of nano silica on properties of recycled aggregate concrete

Effect of mixing methods of nano silica on properties of recycled aggregate concrete

Enhancing the Hardened Properties of Recycled Concrete (RC) through Synergistic Incorporation of Fiber Reinforcement and Silica Fume

Mechanical Properties of Recycled Aggregate Concrete With Steel Fiber: A Review

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