Combination of LCA and circularity index for assessment of environmental impact of recycled aggregate concrete

Kadawo, Abdinasir; Sadagopan, Madumita; During, Otto; Bolton, Kim; Nagy, Á.

doi:10.1080/21650373.2021.2004562

Cited by 15 publications

(5 citation statements)

References 19 publications

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“…The construction industry significantly impacts the environment due to its high material and energy consumption. Concrete has a significant environmental footprint because of the raw materials, energy, and CO 2 emissions associated with its production (about 5-7% of global emissions) [1,2]. However, one strategy that can improve concrete's sustainability is the use of CDW as aggregates in its production [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Concrete has a significant environmental footprint because of the raw materials, energy, and CO 2 emissions associated with its production (about 5-7% of global emissions) [1,2]. However, one strategy that can improve concrete's sustainability is the use of CDW as aggregates in its production [2][3][4]. This approach offers several environmental benefits, including reducing the exploitation of natural resources, decreasing industry and municipal wastes for disposal, and significantly decreasing transportation costs [2,5,6].…”

Section: Introductionmentioning

confidence: 99%

“…However, one strategy that can improve concrete's sustainability is the use of CDW as aggregates in its production [2][3][4]. This approach offers several environmental benefits, including reducing the exploitation of natural resources, decreasing industry and municipal wastes for disposal, and significantly decreasing transportation costs [2,5,6]. Specifically, aggregates derived from concrete demolition, known as recycled concrete aggregates (RA), have been found to possess competitive characteristics for use in the construction industry [7,8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Current Knowledge and Pending Research on Sulfate Resistance of Recycled Aggregate Concrete

Santillán,

Zega,

Irassar

2024

Sustainability

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The building sector’s sustainability requires construction and demolition waste (CDW) to contribute to the circular economy. Among the CDW, recycled concrete aggregates (RA) have been mainly studied to replace natural aggregates. Still, the approval of their use in regulations and standards is slower. Some barriers to the adoption of RA are related to the durability of recycled aggregate concrete (RAC). However, their physical and mechanical properties have been extensively studied. The durability risks associated with sulfate attacks have been solved for conventional concrete. However, sulfate attack on recycled concrete still raises numerous unsolved questions. In this literature review, the experience of sulfate attack on RAC is compiled and analyzed using a compressive framework highlighting the most relevant aspects of the new matrix in RAC and the old matrix of RA to support its relevance to the damaging sulfate process. Suggestions for further research are presented to understand the full extent of this issue and contribute to incorporating and extending recycled aggregates into existing regulations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Current Knowledge and Pending Research on Sulfate Resistance of Recycled Aggregate Concrete

Santillán,

Zega,

Irassar

2024

Sustainability

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“…On the other hand, it realizes the reduction, harmlessness, resourcefulness and industrialization of construction solid waste. In addition, research by related scholars shows that incorporating RA in concrete production significantly reduces carbon dioxide emissions during the manufacturing process, which brings considerable economic and environmental benefits [1,2]. However, the high water absorbance and pressure crushing index of RA, and the more microcracks on the surface of RA, result in the mechanical properties of RAC generally being lower than those of natural aggregate concrete (NAC), which restricts the promotion and application of RAC [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Impact Resistance of Polymer-Modified Steel Fiber-Reinforced Recycled Aggregate Concrete

Xia,

Wang,

Ren

2023

Buildings

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Recycled aggregate concrete (RAC), composed of aggregates sourced from construction solid waste, has garnered significant attention owing to its notable environmental friendliness. In this study, waterborne epoxy resin (WER) and steel fibers (SFs) were introduced into the RAC to enhance its performance. Orthogonal tests were meticulously designed, with the substitution rate of recycled aggregate (RA), SF dosage and WER dosage as variable factors, to comprehensively analyze the splitting tensile strength and impact resistance of concrete. The impact resistance of concrete was investigated via the drop weight test method. Furthermore, scanning electron microscopy (SEM) was employed to scrutinize the microstructure of concrete, investigating the modification mechanism of WER. The results indicated that the addition of SFs exerted the most pronounced influence on the properties of RAC. As the addition of SFs increased from 0 to 1.0%, there were significant enhancements in the splitting tensile strength and impact energy of the specimens. WER exhibited notable improvements, primarily on the splitting tensile strength, while demonstrating an adverse effect on the impact resistance. Utilizing the Weibull distribution theory, the results of the impact tests were fitted and analyzed to predict the impact life of different mixtures. The predicted results showed high correlations with the measured values.

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“…On the other hand, another important variable in the environmental analysis of the use of RCA in pavement structures is the transportation of the material [14], [18]. Thus, when transportation is not included in the scope of the analysis, large environmental advantages are observed [19], [20].…”

Section: Introductionmentioning

confidence: 99%

Granular Subbase Improvement with Recycled Concrete Aggregates in Tropical Areas

A.¹,

Fontalvo²,

Barre³

et al. 2022

IIUMEJ

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Use of Recycled Concrete Aggregate (RCA) for Granular Subbase (GSB) in the tropical area is evaluated in this work. Among the materials widely studied as replacements in granular and surface layers is RCA. Its mechanical behavior in granular layers has mainly been evaluated with tests such as California Bearing Ratio (CBR). However, abrasion is also a determining property in the strength of these materials. In this study, the performance of Natural Aggregates (NA) with replacement of RCA was evaluated for use as GSB in a tropical area. Even though several laboratory tests were performed, the focus of the article lies on the performance in the Los Angeles (LA) abrasion test. Two replacement percentages of coarse RCA were considered: 10 and 15 % by weight of aggregates. The RCA and NA were characterized according to different laboratory tests: Granulometry, Absorption, Atterberg Limits test, Plasticity, Specific Gravity, and LA abrasion. In turn, all results were compared with Colombian specifications for a typical GSB in the area. In addition, a simple Life Cycle Assessment (LCA) was included to evaluate the environmental impacts of the base and alternative scenarios. The results show that GSB with 10% RCA present a higher abrasion resistance than the GSB with 15% RCA. Even better results are obtained with 10% RCA than with natural GSB. Specifically, average LA abrasion test losses of 30.86, 29.80 and 32.07% were obtained for NA, 10% RCA and 15% RCA, respectively. The LCA results show an increase of 50% and 75% in energy consumption by comparing the base scenario with 10 and 15% RCA replacement, respectively. This leads to an increase of 40 and 80% in carbon monoxide (CO) emissions for 10 and 15% RCA replacement respectively, and 100% in carbon dioxide (CO2) emissions for both alternative scenarios. ABSTRAK: Penggunaan Agregat Konkrit Kitar Semula (RCA) bagi Subtapak Butiran (GSB) bagi kawasan tropika telah dikaji dalam kajian ini. Antara bahan yang banyak dikaji sebagai bahan ganti dalam butiran dan lapisan permukaan adalah RCA. Ciri-ciri mekanikal dalam lapisan butiran telah diuji, terutamanya dengan ujian seperti Nisbah Bearing California (CBR). Walau bagaimanapun, pelelasan juga merupakan ciri penting dalam menentukan ketahanan material. Kajian ini merupakan prestasi Agregasi Semulajadi (NA) dengan ganti RCA yang diuji bagi penggunaan GSB di kawasan tropika. Walaupun pelbagai ujian makmal telah dijalankan, fokus artikel ini terletak pada prestasi ujian pelelasan Los Angeles (LA). Dua gantian bagi peratus RCA kasar telah diambil kira: iaitu pada agregat berat 10% dan 15%. Ciri-ciri RCA dan NA dikategori berdasarkan pelbagai ujian lab yang pelbagai: Granulometri, Penyerapan, ujian Had Atterberg, Keplastikan, Graviti Tertentu dan Pelelasan LA. Kemudian, kesemua dapatan kajian dibandingkan dengan ciri-ciri Kolombia bagi ciri tipikal GSB di kawasan itu. Tambahan, Pentaksiran Kitar Hidup (LCA) yang ringkas dimasukkan bagi menilai impak terhadap alam terhadap penggunaanya pada pangkal bijirin dan pada senario alternatif. Dapatan kajian menunjukkan GSB yang menggunakan RCA 10% mempunyai rintangan lelasan tertinggi berbanding GSB dengan RCA 15%. Tambahan, dapatan kajian yang lebih baik didapati daripada RCA 10% berbanding GSB semula jadi. Terutama pada purata ujian lelasan LA telah mengalami penyusutan sebanyak 30.86, 29.80 dan 32.07% bagi NA, RCA 10% dan RCA 15%, masing-masing. Dapatan LCA menunjukkan peningkatan sebanyak 50% dan 75% pada penggunaan tenaga dengan perbandingan senario Subtapak Butiran dengan gantian RCA 10% dan 15%, masing-masing. Ini membawa kepada peningkatan sebanyak 40% dan 80% emisi karbon monoksida (CO) bagi gantian RCA 10% dan 15% masing-masing, dan emisi karbon dioksida (CO2) 100% bagi kedua-dua senario alternatif.

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Combination of LCA and circularity index for assessment of environmental impact of recycled aggregate concrete

Cited by 15 publications

References 19 publications

Current Knowledge and Pending Research on Sulfate Resistance of Recycled Aggregate Concrete

Current Knowledge and Pending Research on Sulfate Resistance of Recycled Aggregate Concrete

Experimental Study on the Impact Resistance of Polymer-Modified Steel Fiber-Reinforced Recycled Aggregate Concrete

Granular Subbase Improvement with Recycled Concrete Aggregates in Tropical Areas

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