Effects of copper slag and recycled concrete aggregate on the properties of CIR mixes with bitumen emulsion, rice husk ash, Portland cement and fly ash

Behnood, Ali; Gharehveran, Mahsa Modiri; Asl, Farhad Gozali; Ameri, Mahmoud

doi:10.1016/j.conbuildmat.2015.08.021

Cited by 117 publications

(36 citation statements)

References 36 publications

(69 reference statements)

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“…A relationship between voids and water absorption for RHA concrete was determined as shown in Figure 18a and Equations (14) and (15). According to the correlation found, water absorption decreased exponentially as the void in concrete decreased.…”

Section: Volume Of Permeable Void Spaces In Hardened Concretementioning

confidence: 95%

“…The sorptivity by RHA concrete, shown in Table 10, was obtained from the slope of the line that is the best fit to the cumulative amount of water absorption (I) plotted against the square root of time (t 1/2 ), depicted in Figures A1 and A2 shows the cumulative amount of water absorption from which the sorptivity of RAP inclusive concrete was determined and tabulated in (14) w i&b = 3.87 × e 0.027×v (15) w i = 2.25 × e 0.067×v (16) w i&b = 3.89 × e 0.037×v (17) where:w i is absorption after immersion in %; w i&b is absorption after immersion and boiling; and v is the volume of permeable void spaces in %.…”

Section: Volume Of Permeable Void Spaces In Hardened Concretementioning

confidence: 99%

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Experimental Investigation on Engineering Properties of Concrete Incorporating Reclaimed Asphalt Pavement and Rice Husk Ash

2018

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Waste generation from agricultural and construction industries is growing at an upsetting rate that causes a heavy burden on landfill facilities. On the other hand, the construction industry is exhausting natural resources thereby posing environmental problems. This study investigates the potential use of agro-industrial waste such as rice husk ash (RHA) and construction waste like reclaimed asphalt pavement (RAP) as promising construction materials. The durability and physical and mechanical properties of concrete were assessed by partially replacing cement and virgin aggregates with RHA and RAP, up to 20% and 50%, respectively. A total of 22 mixes were studied, twelve of which were devoted to studying the collective effects of RHA and RAP on the engineering properties of concrete. Based on experimental results, RHA and RAP decreased slump, compacting factor, density, water absorption and sorptivity. RHA increased compressive and tensile splitting strength, whereas RAP decreased compressive and tensile splitting strength. Comparable strength and favorable sorptivity values were obtained when 15% RHA was combined with up to 20% RAP in the concrete mix. Thus, utilizing RHA and RAP as concrete ingredients can contribute to solid waste management, engineering and economic benefits.

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Section: Volume Of Permeable Void Spaces In Hardened Concretementioning

confidence: 95%

Section: Volume Of Permeable Void Spaces In Hardened Concretementioning

confidence: 99%

Experimental Investigation on Engineering Properties of Concrete Incorporating Reclaimed Asphalt Pavement and Rice Husk Ash

2018

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“…It has also been ascertained that mineralogy (rock chemical composition), surface texture, absorption, surface ageing, surface coatings, and particle shape can affect the efficiency of an adhesive bond in an asphalt-aggregate mixture [24,25]. Aggregates are characterized by chemical heterogeneity resulting from several factors such as oxidation, coatings, adsorbed films, ledges, kinks, dislocations, and crystallographic anisotropy [26,27]. The charged aggregate surface attracts and orients bitumen polar molecules.…”

Section: Survey Of Types Of Adhesion Promoters Currently Used In the mentioning

confidence: 99%

Adhesion Promoters in Bituminous Road Materials: A Review

Rossi

Teltayev²,

Angelico

2017

Applied Sciences

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Featured Application:The adhesion between aggregate and bitumen is crucial in asphalt pavements and has a strong influence on the service time of the road. Thus, the addition of adhesion promoters is gaining importance, particularly with regard to emerging and more sustainable technologies for asphalt production, which aim to reduce the working temperature, save energy, and guarantee the safety of specialized personnel. The present work offers an overview on physical and chemical properties of most common types of adhesion promoters currently used in asphalt industry and tries to build a bridge between scientific research and technological application.Abstract: This review focuses on certain classes of organic compounds known variously in the specific literature of asphalt as adhesion promoters, antistripping agents, wetting agents, antistrips, or adhesion agents. These kinds of organic additives are currently formulated to enhance the bitumen coating of mineral aggregates and improve the workability of asphalt mixtures. In this review, the term "adhesion promoters" includes both synthetic organic compounds as well as those extracted from natural resources, mixed in trace amounts to bitumen. Their main role is to alter the interfacial energy, so that the presence of water, even in trace, does not weaken the bitumen-aggregate bond and tends to favor adhesion. The report also considers the chemical functionalities that play a predominant role in bonding, as well as the effects of surface modification of the aggregate due to the presence of adhesion promoters in pre-blended bituminous mixtures. Although bitumen is widely used in road pavement construction and the discussion is mainly addressed to the improvement of adhesion in road materials, adhesion and wetting properties can also represent a general issue in various bitumen-based industrial products.

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“…14 Production of 1 t of copper produces about 3 t of copper slag and about 24.6 million tons of copper slag is generated from world copper production every year. 15 The recycled copper slag can be used in concrete as a substitute for fine aggregate 16 and it has been reported that the copper slag could reduce the amount of water mixing and improve the fluidity of the concrete, [17][18][19][20] while the mixing of the copper slag aggregate promoted the bleeding of the fresh concrete due to the high density and glassy smooth surface of the copper slag. 21,22 One of the ways to reduce the bleeding is increasing the powder content in concrete.…”

Section: Introductionmentioning

confidence: 99%

Properties of self‐compacting concrete containing copper slag aggregate after heating up to 400°C

Gong

Ueda

2018

Structural Concrete

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In this paper, the influence of heating up to 400°C on properties of the self‐compacting concrete containing recycled copper slag fine aggregate was investigated. The residual mechanical properties such as compressive strength, splitting tensile strength, elastic modulus, and stress–strain curve of the heated concrete were measured with the change in the porosity of concrete. Moreover, the resistance against the penetration of chloride ions (Cl−) into the concrete after the heating was also evaluated. For observing the micro‐structure around the fine aggregate in the concrete, scanning electron microscopy was employed. The experimental results showed that the compressive strength of the concrete decreased with the mixing of copper slag fine aggregate, although the residual compressive strength increased after heating up to 300°C with the rise in temperature. Mixing copper slag fine aggregate into concrete also reduced the residual elastic modulus and accelerated Cl− penetration into the self‐compacting concrete when the maximum temperature exceeded 200°C.

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Effects of copper slag and recycled concrete aggregate on the properties of CIR mixes with bitumen emulsion, rice husk ash, Portland cement and fly ash

Cited by 117 publications

References 36 publications

Experimental Investigation on Engineering Properties of Concrete Incorporating Reclaimed Asphalt Pavement and Rice Husk Ash

Experimental Investigation on Engineering Properties of Concrete Incorporating Reclaimed Asphalt Pavement and Rice Husk Ash

Adhesion Promoters in Bituminous Road Materials: A Review

Properties of self‐compacting concrete containing copper slag aggregate after heating up to 400°C

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