Performance Improvement of Recycled Concrete Aggregates and Their Potential Applications in Infrastructure: A Review

Han, Shuxia; Zhao, Sumei; Lu, Dong; Wang, Daiyu

doi:10.3390/buildings13061411

Cited by 6 publications

(6 citation statements)

References 179 publications

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“…[46], [47], [48] X-ray Diffraction (XRD): This method involves examining the mineralogical composition of aggregates pre-and post-polymer treatment. XRD analysis aids in identifying alterations in crystal structure and the extent of polymer infiltration into the aggregates [38].…”

Section: Method/technique Short Description Referencesmentioning

confidence: 99%

“…Scanning Electron Microscopy (SEM): SEM is employed to scrutinize the aggregates' microstructure pre and post polymer treatment, aiding in assessing both the extent of polymer penetration and alterations in the aggregates' surface morphology [38].…”

Section: Method/technique Short Description Referencesmentioning

confidence: 99%

“…Comprehensive Evaluation Methods: Developed comprehensive assessment approaches can be employed to evaluate the efficacy of various surface treatments, such as polymer impregnation, in enhancing the characteristics of recycled concrete aggregates [38].…”

Section: Physical and Mechanical Testingmentioning

confidence: 99%

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Enhancing Off-Spec Limestone Aggregates with Polymer Treatment for Sustainable Infrastructure Construction – A Review

2024

BJoST

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The utilization of off-spec limestone aggregates in concrete production presents both challenges and opportunities for sustainable infrastructure development. These aggregates, abundant yet often failing to meet industry standards, remain underutilized despite their potential contribution to construction. The review assesses the characteristics of off-spec limestone aggregates, their implications on concrete performance, and explores polymer modification techniques to enhance their suitability for construction. Off-spec aggregates exhibit diverse physical and chemical attributes, varying from standard specifications, impacting their strength, durability, and composition. Polymer modification methods, including latex modification, silane coupling agents, epoxy and acrylic resin treatments, impregnation, physical modification, etc. offer avenues for improving aggregate properties, yet each technique presents distinct merits and demerits. The impact of polymer treatment manifests in changes to density, water absorption, and mechanical properties, as observed through SEM, FTIR, and BET analyses. Evaluating treated aggregates involves assessing their performance under diverse environmental conditions, including exposure to water, chloride solutions, and thermal stress cycles, revealing improvements in durability and bonding within concrete matrices. Implementing polymer-treated aggregates in construction projects proves feasible, offering enhanced mechanical properties, reduced water absorption, and potential environmental and economic benefits through reduced cement usage and waste generation. This review emphasizes the significance of complying with industry standards for size, strength, durability, and other physical and chemical properties to render off-spec aggregates suitable for concrete production. The amalgamation of various polymer modification techniques, as discussed comprehensively in the manuscript, not only ensures enhanced concrete performance but also contributes to the sustainability of infrastructure construction practices. LITERATURE REVIEWThis section focuses on characteristics of off-spec limestone aggregates, different methods and techniques of polymer modification of the aggregates, effects of polymer treatment on the aggregates, evaluation of performance of treated aggregates, and the application of treated aggregates in the concrete industry. Characteristics of Off-Spec Limestone AggregatesOff-spec limestone aggregates are those that do not meet the standard specifications for use in construction. These aggregates, deviate from standard specifications in size, shape, gradation, strength, and durability, require treatment with polymers due to their inherent deficiencies (Table 1). The aggregates present variations in size, shape, and gradation, impacting concrete properties and workability, potentially leading to reduced strength and durability. Additionally, their susceptibility to weathering, and impurities affecting bond integrity with cement paste, and non-compliance with industry standard...

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Section: Method/technique Short Description Referencesmentioning

confidence: 99%

Section: Method/technique Short Description Referencesmentioning

confidence: 99%

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Enhancing Off-Spec Limestone Aggregates with Polymer Treatment for Sustainable Infrastructure Construction – A Review

2024

BJoST

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“…The study of the existing construction waste recycling system shows that China has basically reduced construction waste, but the reutilization rate of construction waste remains low [6]. At present, the construction waste reutilization technology of China is Buildings 2023, 13, 2802 2 of 17 relatively mature [7,8], so to improve the construction waste recycling efficiency is to solve the problem of low reutilization rate of construction waste. The low recycling efficiency is due to various reasons, among which the most critical problem is the difficulty of recycling raw materials due to unreasonable transport path planning [9,10].…”

Section: Introductionmentioning

confidence: 99%

Urban Construction Waste Recycling Path: Robust Optimization

Wu,

Mei,

et al. 2023

Buildings

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The world produces a huge amount of urban construction waste each year. Scientific planning of the construction waste recycling path is urgently needed to improve the recycling of construction waste. Existing construction waste recycling models do not pay sufficient attention to the uncertainty of the recycling quantity, which limits their ability to provide support for solving practical problems. The purpose of this paper is to solve the problem of uncertain recycling quantities in optimizing the urban construction waste recycling path. Thus, this paper first builds a recycling model for a deterministic environment with the economic objective as the decision criterion and the transportation flow, construction waste treatment capacity and capability, and environmental and social impact as the constraints. Then, a robust optimization method is adopted to optimize the deterministic model for the uncertainty of the recycling quantity. The data of this paper are from Nanjing, China. The validity of the model and the evolution of the recycling path are tested based on the data of Nanjing. The findings of this paper are as follows: Firstly, the robust model is cost-effective in the face of uncertainty in supply. Secondly, the robust model has greater total treatment capacity. Even in the worst-case scenario, it can guarantee a higher treatment capacity. Thirdly, both models follow the proximity principle which reduces the transportation costs and only slowly increases the total cost of the robust model. This paper provides a scientific and convenient tool to plan the recycling path of construction waste in large cities.

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“…Efficient methods for separating and cleaning aggregates can enhance performance and contribute to sustainable construction practices [11]. Experimental studies aim to enhance RCA concrete's strength, durability, and performance by incorporating additives and techniques [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effects of surface modified recycled coarse aggregates on concrete’s mechanical characteristics

Panghal,

Kumar

2023

Mater. Res. Express

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Sustainable concrete using recycled coarse aggregates from construction and demolition waste is gaining popularity in the construction industry, but has poor mechanical characteristics due to old cement mortar adhering to aggregate surfaces. This study uses two processes (abrasion treatment and cement slurry treatment) to modify the surface of recycled coarse aggregates (RCA) to minimize the strength loss of RCA and enhance the bonding properties of the concrete matrix and RCA. Surface-modified RCA replaced coarse aggregates in varying percentages, ranging from 0 to 100% in 25% increments. To comprehend the effects of surface-modified RCA, the workability, compressive strength, flexural strength, split tensile strength, microstructural characteristics (XRD, SEM, and EDAX), and modulus of elasticity of concrete are evaluated. Surface-modified RCA improves concrete’s mechanical characteristics, but abrasion-treated RCA has significantly greater strength than reference concrete up to 50% replacement level, while cement slurry treatment has slightly lower strength. Test findings reveal that among all the two processes of surface modifications of RCA, abrasion treatment is more effective and efficient. At 100% replacement level, surface-modified RCA by abrasion treatment reduces compressive, flexural, and split tensile strength by 10.89%, 10.42%, and 09.92% compared to reference concrete, while surface-modified RCA by cement slurry treatment reduces these values by 14.80%, 13.27%, and 12.76%. Surface modifications improve bonding properties of RCA and cement matrix, reducing porosity and resulting in dense and strong ITZs compared to unmodified RCA.

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Performance Improvement of Recycled Concrete Aggregates and Their Potential Applications in Infrastructure: A Review

Cited by 6 publications

References 179 publications

Enhancing Off-Spec Limestone Aggregates with Polymer Treatment for Sustainable Infrastructure Construction – A Review

Enhancing Off-Spec Limestone Aggregates with Polymer Treatment for Sustainable Infrastructure Construction – A Review

Urban Construction Waste Recycling Path: Robust Optimization

Effects of surface modified recycled coarse aggregates on concrete’s mechanical characteristics

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