Mechanical Properties of Concrete with Recycled Concrete Aggregate and Fly Ash

Katar, Ihab; Ibrahim, Yasser E.; Malik, Mohammad Abdul; Khahro, Shabir Hussain

doi:10.3390/recycling6020023

Cited by 17 publications

(7 citation statements)

References 29 publications

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“…The outcomes demonstrate how Recycled Aggregate Concrete (RAC) is enhanced by the superplasticizer. The specimens with the highest compressive strength were control samples made up completely of natural stone aggregate, both with and without the superplasticizer (NAC and NACA) [18]. The increase in compressive strength of 11.1%, 22.3% and 27.4% after 28 days was noticed when RSAC was employed in place of a superplasticizer, with RSA replacing 25%, 50%, and 100% of NA, respectively.…”

Section: Impact Of Superplasticizer In Compressive Strengthmentioning

confidence: 99%

Mechanical properties of recycled concrete aggregates with superplasticizer

Nachimuthu,

Viswanathan,

Subramaniyan

et al. 2024

Matéria (Rio J.)

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Many dilapidated civil constructions have been demolished as a result of the necessity for rehabilitation and the effective use of the land that is available. The build-up of waste materials from destroyed concrete strains landfills and adds to the environmental load, making development initiatives unfeasible. Superplasticizers can be used to improve the mechanical characteristics of concrete, which is one way to address this problem. The objective of this work is to assess how a superplasticizer affects the mechanical characteristics of concrete made using recycled aggregate. In order to make concrete specimens, several replacement ratios of fresh natural aggregates with recycled stone and brick aggregates were tested, ranging from 0% to 100%. After applying the superplasticizer to 50% of the concrete specimens, the water content of the concrete mixtures decreased by 15%. The outcomes of the tests show that adding superplasticizers to recycled aggregate concrete improves its mechanical qualities. The mechanical performance of the concrete was found to be unaffected by the addition of superplasticizer, even when recovered stone and brick aggregates replace 50% and 25% of the fresh, natural coarse aggregates, respectively.

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Section: Impact Of Superplasticizer In Compressive Strengthmentioning

confidence: 99%

Mechanical properties of recycled concrete aggregates with superplasticizer

Nachimuthu,

Viswanathan,

Subramaniyan

et al. 2024

Matéria (Rio J.)

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“…Sci. 2024, 14,1974 2 of 14 on the mechanical properties and other aspects of recycled concrete [18][19][20][21][22][23][24][25].The production of recycled concrete using waste concrete coarse aggregate as variables of substitution rate and water cement ratio shows that the higher the substitution rate, the more unfavorable the mechanical and working properties of recycled concrete. The higher the strength of the original waste concrete, the better the mechanical properties of recycled concrete.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Preparation and Characteristics of Concrete Modified by Construction Waste

Zhang,

Zhu,

Zhou

et al. 2024

Applied Sciences

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With the advancement of urbanization construction, the proportion of construction waste to the total urban waste continues to increase, especially waste concrete. The treatment and reuse of waste concrete is a major trend that poses enormous pressure on environmental protection. This article focuses on the problems in the preparation of recycled aggregates from waste concrete, which has important practical value. This article presents a new type of recycled concrete prepared through surface modification of recycled coarse aggregate and design experiments to change the replacement rate of coarse aggregate. The physical properties of recycled coarse aggregate, workability of fresh concrete, and mechanical properties of recycled concrete are analyzed. The research results indicate the following: (1) Through surface modification, recycled concrete can improve the workability of fresh concrete at a fixed water cement ratio, which can meet the requirements of mixing, transportation, and pouring of fresh concrete. (2) By modifying the surface of recycled aggregates, the strong water absorption performance of recycled aggregates caused by old mortar and surface defects has been reduced. And the modification effect of recycled aggregate improves the hydration process of recycled concrete, making the surface structure dense and further enhancing the strength of recycled concrete. (3) The compressive strength of recycled concrete specifications from construction waste shows a decreasing trend with the increase in coat aggregate replacement rate. The final ratio is as follows: modular dose of 12%, modification time of 90 min, and 20% recycled aggregate content.

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“…The first involves enriching the composition with supplementary cementitious materials [5][6][7]. This is usually fly ash, ground granulated blast-furnace slag, silica fume or metakaolin [8][9][10][11][12][13][14]. The second approach focuses on the aggregate itself and its treatment before use in concrete.…”

Section: Introductionmentioning

confidence: 99%

Influence of Citric Acid-Assisted Impregnation of Recycled Aggregate on the Properties of the Resultant Concrete

2023

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The paper presents the results of tests on concrete with recycled aggregate impregnated with the use of citric acid. Impregnation was carried out in two stages, with a suspension of calcium hydroxide in water (so-called milk of lime) or diluted water glass used as the second impregnant. The mechanical properties of the concrete were carried out: compressive strength, tensile strength and resistance to cyclic freezing. In addition, concrete durability parameters such as water absorption, sorptivity and torrent air permeability were investigated. The tests showed that this type of impregnation did not improve most of the parameters of concrete with impregnated recycled aggregate. The mechanical parameters after 28 days were significantly lower compared to the reference concrete, although after a longer curing period, these differences decreased significantly for some series. The durability parameters of the concrete with impregnated recycled aggregate also deteriorated compared to the reference concrete with the exception of air permeability. The results of the tests carried out indicate that impregnation using water glass in combination with citric acid gives the best results in most cases and that the order in which the impregnation solutions are applied is very important. Tests also showed that the effectiveness of impregnation is very much influenced by the value of the w/c ratio.

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Mechanical Properties of Concrete with Recycled Concrete Aggregate and Fly Ash

Cited by 17 publications

References 29 publications

Mechanical properties of recycled concrete aggregates with superplasticizer

Mechanical properties of recycled concrete aggregates with superplasticizer

Experimental Study on Preparation and Characteristics of Concrete Modified by Construction Waste

Influence of Citric Acid-Assisted Impregnation of Recycled Aggregate on the Properties of the Resultant Concrete

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