Influence of Partial Coarse Fraction Substitution of Natural Aggregate by Recycled Concrete Aggregate in Hot Asphalt Mixtures

Alvarez, Debora Acosta; Aenlle, Anadelys Alonso; Tenza-Abril, Antonio José; Ivorra, Salvador

doi:10.3390/su12010250

Cited by 26 publications

(17 citation statements)

References 32 publications

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“…Other uses of the RCA include: roads substructures, earth dam construction [35][36][37], paving blocks and structural blocks and bricks manufacture [37,38], bituminous-aggregate mixes [39][40][41][42], road pavements [43], self-compacting concrete [44][45][46], polymer concrete [47], shotcrete [48,49], concrete exposed to elevated temperatures [50], soil stabilization [51], pervious concrete [52], reactive powder concrete [53], artificial reef formation [37].…”

Section: Introductionmentioning

confidence: 99%

Properties of Concrete with Recycled Concrete Aggregate Containing Metallurgical Sludge Waste

et al. 2020

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Sand has been considered to be something of an immeasurable quantity. There are many indications that this view is no longer valid and that the limiting of natural aggregates usage is doubly justified. Firstly, the extraction of natural aggregates is expensive and has a huge impact on the environment. The main issues in sand and gravel mining are the large areas that are affected, ground water level changes, illegal mining, unsuitability of desert and marine sand, and costs of transport. Secondly, metallurgical waste can be used as a substitute for natural aggregates. This is doubly beneficial—the waste is recycled and the use of natural aggregates is reduced. Waste is stored in landfills that take up large areas and there is also the possibility of ground and groundwater pollution by hazardous compounds. The research presented in this article focuses on the technological conditions of using metallurgical waste in its original form and as a component of recycled concrete aggregate (RCA). The use of metallurgical sludge waste or crushed or round RCA to produce concrete deteriorates the consistency and does not significantly affect the air content and density of the concrete mix. RCA lowers the density of hardened concrete. Metallurgical sludge waste or RCA usage adversely affect the absorbability and permeability of concrete. Concrete containing metallurgical sludge waste is of higher compressive strength after 7 and 28 days, with up to 60% of waste as a sand replacement. RCA concrete achieved higher compressive strength also.

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Section: Introductionmentioning

confidence: 99%

Properties of Concrete with Recycled Concrete Aggregate Containing Metallurgical Sludge Waste

et al. 2020

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“…The growing interest in the sustainable management of production processes is of particular relevance to justify special measures in the design and construction of civil infrastructure and buildings. The use of waste materials in construction is in line with the principles of sustainable development, and there exists a number of environmentally friendly production technologies that make use of waste material as fillers or additions to concrete and other construction materials, such as asphalt [1][2][3][4][5]. Among the different existing alternatives, the use of concrete with recycled aggregates, which incorporate aggregates from construction and demolition waste, is particularly relevant.…”

Section: Introductionmentioning

confidence: 99%

Residual Compressive Strength of Recycled Aggregate Concretes after High Temperature Exposure

et al. 2020

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Sustainability requirements are gaining importance in the construction industry, which needs to take specific measures in the design and construction of concrete structures. The use of recycled aggregates in concrete may be of special interest. Recycling a construction waste will close the life cycle of the original materials (e.g., concrete). Thus, environmental benefits would come from the lower waste generation, and from a lower necessity of raw materials for new structures. The current Spanish code for structural concrete considers the use of recycled aggregates in replacement rates up to 20% by aggregate mass, assimilating their properties with those of concretes without aggregate replacement. Higher substitution percentages would require further testing. In this work, substitution of coarse aggregate for recycled aggregates (with replacement percentages of 25%, 50% and 100%) has been studied, and the concrete’s residual properties after exposure to high temperatures (between 350 °C and 850 °C) have been assessed. Compressive strength and capillary water absorption tests were made after heating, and the experiments showed higher residual strength in concretes with the greatest content of recycled aggregates. However, a statistical analysis made with additional data available in the literature seemed to predict otherwise, and the recycled aggregate replacement would have a negative effect on the residual strength.

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“…Environmental policies in Cuba have been developed for managing CDW, because its natural resources are limited. Hence, several research studies have tried to reuse RCA for manufacturing HMA [19,20] in the place of NA, to reduce the negative impact generated by the wastes and the natural resources exploitation developing the Cuban sustainable construction.…”

Section: Introductionmentioning

confidence: 99%

Combining Reclaimed Asphalt Pavement (RAP) and Recycled Concrete Aggregate (RCA) from Cuba to Obtain a Coarse Aggregate Fraction

et al. 2020

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In Cuba, tons of construction and demolition waste (CDW) are generated during urban construction and reconstruction activities every year. The use of CDW, such as recycled concrete aggregates (RCA) and reclaimed asphalt pavement (RAP), in pavement construction is a viable solution to preserve the consumption of natural aggregates (NA), and to minimize the impact of landfill. The main objective of this work is to obtain a 5–10 mm aggregate fraction of RCA and RAP, to obtain an appropriate recycled coarse aggregate for manufacturing hot mix asphalt (HMA). Each source of RCA, RAP and NA, and the combinations RCA/RAP (0/100, 25/75, 50/50, 75/25 and 100/0) were characterized (moisture, asphalt content of RAP, specific gravity, water absorption, and flakiness index) for determining a better combination. The results showed that the combination (RCA/RAP) that best meets the NA aggregates specifications used for hot mix asphalt were RCA/RAP: 25/75 and 50/50. The results show the possibility of combining both wastes to obtain a coarse aggregate fraction with a high environmental benefit, by reducing the use of natural resources.

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Influence of Partial Coarse Fraction Substitution of Natural Aggregate by Recycled Concrete Aggregate in Hot Asphalt Mixtures

Cited by 26 publications

References 32 publications

Properties of Concrete with Recycled Concrete Aggregate Containing Metallurgical Sludge Waste

Properties of Concrete with Recycled Concrete Aggregate Containing Metallurgical Sludge Waste

Residual Compressive Strength of Recycled Aggregate Concretes after High Temperature Exposure

Combining Reclaimed Asphalt Pavement (RAP) and Recycled Concrete Aggregate (RCA) from Cuba to Obtain a Coarse Aggregate Fraction

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