Special Issue "Recycled Concrete Towards a Sustainable Society"

Submission Deadline: 31 August 2021 (closed)
Guest Editors
Jianzhuang Xiao , Professor, School of civil engineering, Tongji University, China.

Dr. Jianzhuang Xiao is the winner of National Outstanding Youth Fund, Humboldt Scholar of Germany, chairman of RILEM International Committee on structural behavior and innovation of recycled concrete, deputy chairman of Sustainable Civil Engineering Research Committee and chairman of Recycled Concrete Academic Exchange Committee. He is also editor of several national and industrial standards, author of 3 books and of more than 100 publications in refereed journals, and as editor or reviewer of many SCI journals. He is specialized in material behavior and structural performance of recycled aggregate concrete, fire response and resistance of high-performance concrete structures, rehabilitation and strengthening with composite material and committed to basic research and industrial innovation of solid waste recycling in recent years.


Summary

The shortage of concrete materials has become increasingly prominent in the building industry. Waste concrete recycling is an effective way to overcome this resource shortage, which attracts the most interest from researchers to builders. Therefore, significant researches have been conducted, and some recycling techniques have been successfully applied in engineering projects. However, the high efficiency and full utilization of waste building materials still require significant research and innovation.


This Special Issue “Recycled Concrete Towards a Sustainable Society” mainly focuses on the current research progress of the recycled aggregate and concrete. It will cover the aspects of the experimental and theoretical innovation related to the recycled coarse aggregate concrete, recycled fine aggregate concrete, recycled powder concrete, recycled brick aggregate concrete, spoil recycled material and new-type recycled concrete etc. The scope of interests includes but is not limited to the following topics: 

(1) Waste concrete crushing and recycled aggregate production technologies;

(2) The basic performance and degradation mechanism of recycled aggregate;

(3) The strength and constitutive relationship of recycled concrete;

(4) The durability of recycled concrete;

(5) The performance improvement technology and mix proportion design method of recycled concrete;

(6) The seismic performance and design method of recycled concrete;

(7) New-type recycled concrete and structures (full regeneration recycled concrete, 3D printed recycled concrete, composite recycled concrete structure, removable structures, etc.);

(8) Recycled concrete products.


Keywords
Recycled concrete; Recycled aggregate; Material properties; Concrete structure; Mechanical properties; Durability; Production and application

Published Papers
  • Evaluation of Various Modification Methods for Enhancing the Performance of Recycled Concrete Aggregate
  • Abstract Due to the existence of the attached mortar, the performance of the recycled concrete aggregate (RCA) is inferior to the natural aggregate, which significantly limits its wide application in industry. In this study, five kinds of modified solutions were used to modify the surface of RCA, and the modification effects were compared. The results showed that sodium silicate, nano-silica (NS), Bacillus pasteurii and soybean powder had relatively good modification effects on RCA, which could reduce the crushing value and water absorption, and increase apparent density. The composite solution (15% sodium silicate and 2% NS) and soybean powder solution had better… More
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  • Sustainable Asphalt Concrete Containing RAP and Coal Gangue Aggregate: Performance, Costs, and Environmental Impact
  • Abstract The shortage of natural aggregates is becoming a severe problem in the pavement industry globally. To address this issue, in this study, an effort was made to use reclaimed asphalt pavement (RAP) and coal gangue (CG) as coarse and fine aggregate, respectively for producing the hot mix asphalt (HMA). As the replacement of natural aggregate, there were seven types of HMA containing 20% and 40% RAP coarse aggregate content, and 10% and 25% CG fine aggregate content were designed and prepared. In addition, Marshall Stability test, rutting resistance test, immersion Marshall test, freezing-thaw splitting test, moisture-induced sensitivity test, and low-temperature… More
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  • Experimental Performance Measures of Recycled Insulation Concrete Blocks from Construction and Demolition Waste
  • Abstract Construction and demolition (C&D) waste has seriously affected the ecological environment. The utilization of C&D waste resources can greatly alleviate this problem, and it is an important way to help achieve the goal of zero carbon in 2050. In this study, insulation concrete blocks were developed with recycled aggregates, cement, fly ash as main raw materials, expanded polystyrene (EPS) insulation boards as block insulation filling material, and self-developed construction waste composite activator, interface enhancer, surface modifier and other additives. Through experimental research and performance test analysis, the best mix ratio of the product and the mechanism of each additive were… More
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  • Effect of Recycled Mixed Powder on the Mechanical Properties and Microstructure of Concrete
  • Abstract In this paper, recycled bricks and recycled concrete were applied to prepare eco-friendly recycled mixed powder (RMP) cementitious material, as a supplementary to replace conventional cement for improve the recycling of construction and demolition waste. Based on the effect of cementitious materials on the hydration of silicate cement, the effects of RMP on the workability, mechanical properties and microstructure of recycled mixed powder concrete (RMPC) with the different replacement ratios and the 8:4 and 6:4 mixing ratio of recycled brick powder (RBP) and recycled concrete powder (RCP) were investigated. The results showed that the fluidity of the mix decreased with… More
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  • Experimental Investigation on the Mechanical Properties of Natural Fiber Reinforced Concrete
  • Abstract Recently, addition of various natural fibers to high strength concrete has aroused great interest in the field of building materials. This is because natural fibers are much cheaper and locally available, as compare to synthetic fibers. Keeping in view, this current research conducted mainly focuses on the static properties of hybridized (sisal/coir), sisal and coir fiber-reinforced concrete. Two types of natural fibers sisal and coir were used in the experiment with different lengths of 10, 20 and 30 mm and various natural fiber concentrations of 0.5%, 1.0%, and 1.5% by mass of cement, to investigate the static properties of sisal… More
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  • Mechanical Properties and Microcosmic Properties of Self-Compacting Concrete Modified by Compound Admixtures
  • Abstract It has become a research hotspot to explore raw material substitutes of concrete. It is important to research the mechanical properties of self-compacting concrete (SCC) with slag powder (SP) and rubber particle (RP) replacing cement and coarse aggregate, respectively. 12 kinds of composite modified self-compacting concrete (CMSCC) specimens were prepared by using 10%, 20% and 30% SP and 30%, 40%, 50% and 60% RP. The rheological properties, mechanical properties and microstructure of the CMSCC were investigated. Results indicate that the workability, compressive strength, splitting tensile strength and flexural strength of CMSCC prepared by 20% SP and less than 40% RP… More
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  • Finite Element Analysis on the Uniaxial Compressive Behavior of Concrete with Large-Size Recycled Coarse Aggregate
  • Abstract To model the concrete with complex internal structure of concrete with large sized aggregates the effect of internal structure on uniaxial compression behavior are studied. Large-sized recycled aggregates behave differently in the concrete matrix. To understand the influence on concrete matrix, a finite element model was developed to model recycled aggregate concrete composed of multiple randomly distributed irregular aggregates and cement mortar. The model was used to calculate the effect of large-size recycled coarse aggregate (LRCA) on the strength of recycled aggregate concrete and simulate the compressive strength of cubes and prisms. The factors such as the strength of new… More
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  • Utilization of Recycled Concrete Powder in Cement Composite: Strength, Microstructure and Hydration Characteristics
  • Abstract Recycled concrete powder (RCP) is used more and more in cement-based materials, but its influence on the hydration process is still unclear. Therefore, this paper studied the influence of recycled concrete powder (RCP) on the hydration process of cement and provides a theoretical basis for the hydration mechanism of cement composite materials. The hydration heat method was used to systematically analyze the thermal evolution process of cement paste with or without RCP. Hydration products were identified using X-ray diffraction (XRD) and thermal analysis (TG–DSC). The pore structure change of cement pastes was analyzed by mercury intrusion porosimetry (MIP) method. The… More
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  • Study on Carbonation Damage Constitutive Curve and Microscopic Damage Mechanism of Tailing Recycled Concrete
  • Abstract To improve the resource utilization of recycled aggregate concrete (RAC) and make use of the unique pozzolanic activation characteristics of iron ore tailing (IOT), the constitutive curves of tailing recycled concrete (TRC) before and after carbonization were analyzed theoretically, experimentally and microscopically. Firstly, according to the experimental data, the damage constitutive and related damage parameters of TRC were theoretically established by Weibull probability distribution function. Secondly, the comprehensive damage parameter b under different working conditions was studied. Finally, the damage mechanism was formed by EDS and SEM. The results showed that the damage constitutive model based on Weibull probability distribution… More
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  • Crack Propagation and Failure Characteristics of Modeled Concrete with Natural and Brick Aggregates
  • Abstract The failure characteristics of recycled concrete containing brick aggregates are still indistinct, especially how the angular aggregates effect the crack propagation. Based on the concept of modeled concrete, the development of cracks in concrete containing the natural aggregate and brick aggregate under a compression loading was studied. The strain distribution was analyzed with the Digital Image Correlation (DIC). The modeled aggregates include circular and squared ones, and the squared modeled aggregates were placed in different orientations, including 0°, 22.5° and 45°. The results show that when the aggregate is placed at 45°, the upper and lower vertices of the aggregate… More
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  • Experimental and Theoretical Study on the Flexural Behavior of Recycled Concrete Beams Reinforced with GFRP Bars
  • Abstract This paper experimentally investigated the flexural behavior of reinforced recycled aggregate concrete (RAC) beams reinforced with glass fiber-reinforced polymer (GFRP) bars. A total of twelve beams were built and tested up to failure under four-point bending. The main parameters were reinforcement ratio (0.38%, 0.60%, and 1.17%), recycled aggregate replacement ratio (R = 0, 50%, and 100%) and longitudinal reinforcement types (GFRP and steel). The flexural capacity, failure modes, flexibility deformation, reinforcement strains and crack distribution of the tested beams were investigated and compared with the calculation models of American code ACI 440.1-R-15, Canadian code CSA S806-12 and ISIS-M03-07. The tested… More
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  • Bond Behavior between BFRP Bars and Hybrid Fiber Recycled Aggregate Concrete after High Temperature
  • Abstract The aim of this study is to improve the bond performance of basalt fiber reinforced polymer (BFRP) bars and recycled aggregate concrete (RAC) after being exposed to high temperatures. The bond behavior (failure modes, bond strength, bond stress-slip curves) between BFRP bars and hybrid fiber recycled aggregate concrete (HFRAC) after being exposed to temperatures ranging from 20°C up to 500°C was studied by using pull-out tests. The effect of high temperatures on mechanical properties of concrete (compressive strength, splitting tensile strength) and tensile strength of BFRP bars was also investigated. The bond strength decreased as the temperature increased and the… More
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