Optimized treatment of recycled construction and demolition waste in developing sustainable ultra-high performance concrete

Wang, Xinpeng; Yu, Rui; Shui, Zhonghe; Song, Qiulei; Liu, Zhen; Bao, Ming; Liu, Zhijie; Wu, Shuo

doi:10.1016/j.jclepro.2019.02.201

Cited by 100 publications

(28 citation statements)

References 39 publications

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“…However, this process inevitably entails costs associated with additional requirements for inventory and waste processing, and this becomes a deterrent to the introduction of recycling and upcycling. Official institutions, referring to legal norms and rules, play a decisive role in motivating firms and individuals to implement recycling and upcycling [3]. In addition, the practice of using off-site products and components (low-waste construction technology), material-specific waste handling (waste sorting), and construction and material standardization are also important to help reduce construction waste on-site and proper handling of building materials [35].…”

Section: Discussionmentioning

confidence: 99%

“…In addition, one should keep in mind that construction products and real estate represent a class of assets associated with intense carbon emissions. Therefore, the construction industry may be considered a key component in delivering the world for a sustainable future [3]. From this perspective, it is important to find new ways and methods to green the construction and building operations and ensure that the economic interests of all stakeholders involved in the development of construction projects are met [4].…”

Section: Introductionmentioning

confidence: 99%

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Recycling and Upcycling in the Practice of Waste Management of Construction Giants

et al. 2021

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The purpose of this study was to assess the impact of recycling and upcycling technologies on the level of efficiency of large construction companies in the context of waste management practice. The research methodology was based on regression analysis and factorial analysis of variance. Based on the assessment of waste management efficiency in the context of recycling (upcycling), the positive dynamics of the efficiency of its implementation was determined in comparison with traditional waste disposal. The levels of the relationship among net profit, investment in waste management, and recycling efficiency for the companies under study were determined. Regression analysis of the impact of recycling efficiency on the performance of the companies under study in the context of waste management demonstrated a positive effect of an increase in the efficiency of recycling (upcycling) on the net profit of all companies under study. However, at the same time, there was a different effect and degree of influence of this indicator according to the formed scenarios. Despite the high efficiency of recycling (upcycling), the prospective increase in its level does not have a proportional relationship with profit but depends on the development factors of the construction company. Two-way analysis of variance demonstrated a strong influence of the efficiency of recycling (upcycling) and waste disposal on waste management efficiency. It was proven that companies that currently have a high level of recycling (upcycling) efficiency are practically not focused on traditional waste disposal, since recycling has a more significant and positive impact on the effectiveness of their activities.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recycling and Upcycling in the Practice of Waste Management of Construction Giants

et al. 2021

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“…Although the incorporation of lead-zinc tailings reduced the compressive strength, it remarkably decreased the autogenous shrinkage of UHSC [14]. e incorporation of 50% demolition waste to replace cement reduced the compressive strength of UHSC from 125 MPa to 109 MPa, but it still met the requirement of Chinese standard [15]. e incorporation of 40% phosphorous slag reduced the compressive strength of UHSC at three days, but it presented a comparable strength at 28 days [16].…”

Section: Introductionmentioning

confidence: 96%

The Relationship between Cementitious Composition and Properties of Ultrahigh Strength Concrete

Wang

Zhang

2021

Advances in Civil Engineering

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It is well known that supplementary cementitious materials (SCMs) have obvious effects on the properties of concrete. In order to understand the relationship between cementitious materials and properties of ultrahigh strength concrete (UHSC), the cementitious compositions of UHSC were designed by the simple-centroid design method. The effects of cementitious compositions on the properties of UHSC were investigated. It was found that the incorporation of silica fume (SF) improved the flowability and strength of UHSC, but it decreased the time of acceleration period, calcium hydroxide (CH) content, and porosity of UHSC at a certain content. The incorporation of fly ash (FA) increased the flowability, time of acceleration period, and porosity of UHSC, but it decreased the strength and CH content of UHSC. The relationships between cement, silica fume, and fly ash and the properties of UHSC were calculated based on the simple-centroid design method.

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“…The peculiar composition of UHDC mixes, which features high cement and binder contents, the adoption of only fine aggregate fractions, and low water/binder ratios, makes them interesting candidates for recyclability. The likely potential presence of high amounts of anhydrous particles of binding materials in the old ITZ (Zhang et al, 2018;Wang et al, 2019;Qian et al, 2020) may make the same ITZ potentially reactive with interesting impacts on the mechanical and durability performance of the R-UHDC material made by employing the recycled UHDC as an aggregate substituting the natural sand aggregate. At the same time, the mix-design characteristics, which foresee the presence of the sole fine fraction of aggregates and steel fibers, may pose likewise peculiar technological challenges in crushing the parent material and sorting the resulting particles to be recycled.…”

Section: Introductionmentioning

confidence: 99%

Performance Assessment of Ultra-High Durability Concrete Produced From Recycled Ultra-High Durability Concrete

Borg

Cuenca

Garofalo

et al. 2021

Front. Built Environ.

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The purpose of the work reported in this paper is to assess the performance of recycled ultra-high durability concrete (R-UHDC), produced using different fractions of recycled aggregate obtained from crushed ultra-high durability concrete (UHDC), as a substitute for the natural aggregate. Four different recycled ultra-high durability concrete (R-UHDC) mixes were designed and manufactured with a reference mix based on the natural aggregate and three mixes with the natural aggregate replaced using recycled UHDC according to two percentage replacement values (50 and 100%). The effect of environmental degradation of the recycled parent concrete was also addressed, using recycled aggregates subjected to accelerated carbonation (replacement percentage equal to 50%). The work has been conducted in the framework of the activities of the Horizon 2020 ReSHEALience Project in ultra-high durability concrete. One key objective of the project was to formulate the concept and experimentally validate the performance of ultra-high durability concrete for structures and infrastructures exposed to extremely aggressive scenarios. The ReSHEALience consortium has defined UHDC as a “strain-hardening (fiber-reinforced) cementitious material with functionalizing micro- and nano-scale constituents especially added to deliver high durability in the cracked state under extremely aggressive exposure conditions.” In this context, the research was conducted to investigate the potential of recycling the UHDC mixes, developed and validated in previous research and employing them as a partial or even total replacement of the natural fine aggregate in the production of new UHDC. This supports the cradle-to-cradle approach in life cycle engineering applications. The research confirmed the effective regeneration of new UHDC based on the recycled aggregate obtained from crushed UHDC, attaining the required rheological characteristics, mechanical properties (compressive strength, flexural strength, and toughness), and durability performance (chloride penetration resistance, chloride migration, water capillary suction, and resistivity). This work is intended as the first step toward the sustainability assessment of the end of life of UHDC materials and structures and the potential of recycled UHDC for new structures and retrofit structural applications.

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Optimized treatment of recycled construction and demolition waste in developing sustainable ultra-high performance concrete

Cited by 100 publications

References 39 publications

Recycling and Upcycling in the Practice of Waste Management of Construction Giants

Recycling and Upcycling in the Practice of Waste Management of Construction Giants

The Relationship between Cementitious Composition and Properties of Ultrahigh Strength Concrete

Performance Assessment of Ultra-High Durability Concrete Produced From Recycled Ultra-High Durability Concrete

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