Crushing treatment on recycled aggregates to improve their mechanical behaviour for use in unbound road layers

Martínez-Echevarría, M.J.; López-Alonso, Mónica; Garach, Laura; Alegre, Javier; Poon, Chi Sun; Agrela, Francisco; Cabrera, Manuel

doi:10.1016/j.conbuildmat.2020.120517

Cited by 24 publications

(6 citation statements)

References 35 publications

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“…Based on the previous findings, it is therefore important to provide insights on the effect of the adhered mortar paste by understanding how its inherent quality characteristics affect the overall performance of conventionally utilized concrete. Several enhancement methods for eliminating the bound mortar have been previously suggested, such as mechanical grinding [8,[13][14][15]; pre-soaking in water or acid, where lightly bound mortar was reportedly removed from the aggregate surface [16][17][18][19]; and thermal mechanical enhancement [20][21][22]. Alternative methodologies also suggested enhancement through surface treatment/crystallization [23], i.e., carbonation [24][25][26][27], calcium carbonate precipitation [9,28], and immersion in sodium silicate solution [18].…”

Section: Introductionmentioning

confidence: 99%

A Mechanical Treatment Method for Recycled Aggregates and Its Effect on Recycled Aggregate-Based Concrete

Savva¹,

Ioannou

Oikonomopoulou

et al. 2021

Materials

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Recycle concrete aggregates (RCA) consist of natural aggregates and remnant mortar adhered to their surface. The amount, size, and morphology of the adherent remainder paste influences quality aspects of RCA, such as their bonding potential with new cement matrix in an RCA-based concrete, as well as the concrete’s overall rheological and performance characteristics. The objective of this research was to study the effect of reducing the adhered mortar in RCA, by means of a mechanical treatment method, on the performance of concrete containing RCA at different percentages. The treatment process was conducted within a concrete mixer truck drum at specific time intervals, the effect of which was determined by means of image analysis, mass loss recordings, and circularity determinations. The effect of size of treated and field RCA, as well as replacement percentages on mechanical performance and durability of high and normal strength concrete mixes, were also investigated. It was concluded that the optimal treatment duration where no further significant removal of adhered paste occurred thereon was 3 h, and concrete mixes containing 3 h treated RCA exhibited comparable performance characteristics to those of the reference concrete mix.

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Section: Introductionmentioning

confidence: 99%

A Mechanical Treatment Method for Recycled Aggregates and Its Effect on Recycled Aggregate-Based Concrete

Savva¹,

Ioannou

Oikonomopoulou

et al. 2021

Materials

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“…According to Surendar et al [17], water absorptivity increases along with the increase in the recycled aggregate substitution of natural aggregate. Moreover, recycled aggregate is characterized by greater absorptivity and increases the water demand, which may affect the hydration process [18]. The aggregate obtained from concrete rubble indicates lower mechanical strength than natural aggregates as well as greater susceptibility to abrasion and crushing value.…”

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confidence: 99%

Sustainable Recycling of High-Strength Concrete as an Alternative to Natural Aggregates in Building Structures

Sadowska‐Buraczewska

Grzegorczyk-Frańczak

2021

Sustainability

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The application of recycled coarse aggregates (RCA) in high-performance concrete (HPC) was analyzed in the article. In the paper, the behavior of HPC with coarse recycled aggregate and natural coarse aggregate (NCA) was compared. Short-term experiments were conducted, including concrete deformation, deflection, load bearing capacity, and cracking of beams. The analysis involved reinforced concrete T-beams made in 100% of RCA or NCA. The studies indicated that the beams with recycled aggregate are characterized by greater deflection and 7.6% lower load bearing capacity in comparison to the beams with NCA. Substitution of coarse natural aggregate with RCA reduced the compressive and tensile strengths by 20 and 26 (%), whereas and the modulus of elasticity was decreased by 15%.

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“…The crusher used in this process can be either primary or secondary. The primary crusher is used to break down larger pieces of waste material, while the secondary crusher is used to further reduce the crushed material size [83]. After the crushing process, the material is then screened to remove any contaminants that may be present.…”

Section: Cdw Processingmentioning

confidence: 99%

An Overview of Methods to Enhance the Environmental Performance of Cement-Based Materials

Suarez-Riera,

Restuccia,

Falliano

et al. 2024

Infrastructures

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Urbanization and demographic growth have led to increased global energy consumption in recent years. Furthermore, construction products and materials industries have contributed significantly to this increase in fossil fuel use, due to their significant energy requirements, and consequent environmental impact, during the extraction and processing of raw materials. To address this environmental problem, architectural design and civil engineering are trying to implement strategies that enable the use of high-performance materials while minimizing the usage of energy-intensive or toxic and dangerous building materials. These efforts also aim to make buildings less energy-consuming during their useful life. Using waste materials, such as Construction and Demolition Waste (CdW), is one of the most promising approaches to address this issue. In recent years, the European Union (EU) has supported recovery strategies focused on using CdW, as they account for more than 30% of the total waste production in the EU. In this regard, reuse techniques—such as incorporating concrete fragments and bricks as road floor fillers—have been the subject of targeted scientific research. This review will outline various strategies for producing green cement and concrete, particularly emphasizing the reuse of Construction and Demolition Waste (CdW).

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Crushing treatment on recycled aggregates to improve their mechanical behaviour for use in unbound road layers

Cited by 24 publications

References 35 publications

A Mechanical Treatment Method for Recycled Aggregates and Its Effect on Recycled Aggregate-Based Concrete

A Mechanical Treatment Method for Recycled Aggregates and Its Effect on Recycled Aggregate-Based Concrete

Sustainable Recycling of High-Strength Concrete as an Alternative to Natural Aggregates in Building Structures

An Overview of Methods to Enhance the Environmental Performance of Cement-Based Materials

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