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Journal articles on the topic 'RCA'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Guo, Yuanchen, Jueshi Qian, and Xue Wang. "Pore Structure and Influence of Recycled Aggregate Concrete on Drying Shrinkage." Mathematical Problems in Engineering 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/912412.

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Pore structure plays an important role in the drying shrinkage of recycled aggregate concrete (RAC). High-precision mercury intrusion and water evaporation were utilized to study the pore structure of RAC, which has a different replacement rate of recycled concrete aggregate (RCA), and to analyze its influence on drying shrinkage. Finally, a fractal-dimension calculation model was established based on the principles of mercury intrusion and fractal-geometry theory. Calculations were performed to study the pore-structure fractal dimension of RAC. Results show the following. (1) With the increas

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2

Kumar, Amit, and Gyani Jail Singh. "Impact Resistance of Treated Recycled Aggregate Concrete: Drop Weight Test." IOP Conference Series: Earth and Environmental Science 1326, no. 1 (2024): 012089. http://dx.doi.org/10.1088/1755-1315/1326/1/012089.

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Abstract The present study deals with recycled aggregate concrete (RAC) performance against impact loads. The drop weight test determines RAC’s strength and impact energy absorption capacity. Recycled concrete aggregates (RCAs) with different qualities (physical and mechanical properties) are used to prepare the RAC mix. The RAC is treated with three different mechanical treatments with varying charges and drum revolutions. It is observed that quality improvisation in RCA improves RAC impact resistance. A strong correlation between the RCA abrasion value and the RAC impact energy is observed,

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3

Kasai, Yoshio. "Development and Subjects of Recycled Aggregate Concrete in Japan." Key Engineering Materials 302-303 (January 2006): 288–300. http://dx.doi.org/10.4028/www.scientific.net/kem.302-303.288.

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The quality of RCA is influenced by the processing method and quality of original concrete. The general character of RCA, RCA and TR A 0006-2000(concrete using recycled aggregate) are introduced. The execution of RAC work, examples of real constructions with RAC, recycling of concrete powder originated from production of RAC and barriers of using RAC are discussed.

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4

Andrade, Kamila Menezes Guedes de, Caroline Mathias, Hugo Felipe do Vale, Flávio Henrique Baggio Aguiar, and Giselle Maria Marchi. "Effect of diphenyliodonium hexafluorphosphate in the yellowing and properties of experimental resin cements." Brazilian Journal of Oral Sciences 18 (November 12, 2019): e191591. http://dx.doi.org/10.20396/bjos.v18i0.8657256.

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Aim: The yellowing effect is undesirable and can occur in the dental restoration margins when light-cured resin cements containing camphorquinone as photoinitiator is used. This study aimed to evaluate the effect of diphenyliodonium hexafluorphosphate (DPI) in photoinitiator systems that contained different concentrations of camphorquinone (CQ) and dimethylamino ethyl benzoate (EDAB) on resin cements. Methods: A base (1:1) of bisphenol A diglycidyl methacrylate (BisGMA) and triethylene glycol dimethacrylate (TEGDMA) was obtained, and 60wt% of glass fillers was added. Eight formulations were ob

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5

Ismail, Sallehan, and Mahyuddin Ramli. "Resistance to Chloride Penetration of Recycled Aggregate Concrete Modified Using Treated Coarse Recycled Concrete Aggregate and Fibres." Materials Science Forum 991 (May 2020): 101–8. http://dx.doi.org/10.4028/www.scientific.net/msf.991.101.

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This paper presents a study that aimed to assess the chloride penetration depth of recycled aggregate concrete (RAC) modified by using treated coarse recycled concrete aggregate (RCA), adding polyolefin (PO) or polypropylene (PP) fibre and comparing with normal concrete. The coupling effects of the treated RCA and fibres on the chloride penetration of RAC were analysed after two different curing regimes (i.e. normal and seawater) and tested at different curing ages (i.e. 90, 180 and 300 days). Results showed that the inclusion of treated coarse RCA can reduce porosity, thereby decreasing the c

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6

Zheng, Yuanxun, Yahui Zhang, Jingbo Zhuo, Peng Zhang, and Weixing Kong. "Mechanical properties and microstructure of nano-strengthened recycled aggregate concrete." Nanotechnology Reviews 11, no. 1 (2022): 1499–510. http://dx.doi.org/10.1515/ntrev-2022-0077.

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Abstract The surface adhesion mortar of recycled coarse aggregate (RCA) is the main factor leading to poor aggregate quality, and it also affects the internal structure and mechanical properties of recycled aggregate concrete (RAC). To improve the quality of RCA and mechanical properties of RAC, self-developed mortar removal equipment was used to strengthen the RCA. Then, the RCA was soaked in 1, 2, and 3% nano-silica solutions, and the vibration-mixing process was used to improve the quality of RAC. In addition, the microstructure of the RAC was examined via scanning electron microscopy to ob

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7

Shan, Haoliang, and Zhouping Yu. "Strength, Chloride Ion Penetration, and Nanoscale Characteristics of Concrete Prepared with Nano-Silica Slurry Pre-Coated Recycled Aggregate." Buildings 12, no. 10 (2022): 1707. http://dx.doi.org/10.3390/buildings12101707.

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It has become a feasible green building development strategy to prepare recycled aggregate concrete (RAC) by processing construction and demolition (C&D) wastes into a recycled coarse aggregate (RCA). On the other hand, defects such as low strength and easy cracking of RAC seriously limit its application in construction materials. In this paper, RCA was strengthened by pre-coated nano-silica (NS) slurry to improve RAC performance. The effect of nano-modified recycled coarse aggregate (MRCA) on concrete compressive strength and chloride ion penetration after replacing ordinary RCA or natura

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8

Yang, Haifeng, Zhiheng Deng, Yinghong Qin, and Liangsheng Lv. "A Study on the Bond Behavior of Corroded Reinforced Concrete Containing Recycled Aggregates." Advances in Materials Science and Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/249301.

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This paper investigated bond-slip characteristics of chloride-induced corroded reinforced concrete incorporating different levels of recycled concrete aggregates (RCA). Pullout tests were adopted to evaluate the bonding and debonding behaviors of the embedded rebar experiencing different corrosion levels. Both high- and low-strength concrete were considered. Bond-slip curves were recorded to determine the influences of rebar corrosion levels and RCA replacements on the bond strength and debonding energy of the specimens. Test results indicate that increasing rebar corrosion level gradually wea

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9

Duan, Zhenhua, Julun Li, Jianzhuang Xiao, and Tianyong Huang. "Exploring effects of initial water content of recycled aggregate and additional water consumption on the permeability resistance of concrete to chlorine salt." Journal of Asian Concrete Federation 9, no. 1 (2023): 31–41. http://dx.doi.org/10.18702/acf.2023.9.1.31.

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Recycled aggregate concrete (RAC) technology is conducive to resource conservation and environmental protection, but the high-water absorption of recycled aggregate makes it difficult to control the durability of RAC. In this study, the combined effects of initial moisture and additional moisture of recycled coarse aggregate (RCA) on the resistance to chloride ion penetration of concrete were investigated. The results show that, when the initial humidity of RCA is lower than 0.25 and the additional water consumption is low, RAC shows a rapid decay of dynamic elastic modulus. In contrast, when

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10

Li, Long, Dongxing Xuan, and Chi Sun Poon. "Stress–Strain Curve and Carbonation Resistance of Recycled Aggregate Concrete after Using Different RCA Treatment Techniques." Applied Sciences 11, no. 9 (2021): 4283. http://dx.doi.org/10.3390/app11094283.

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Five recycled coarse aggregate (RCA) treatment techniques including flow-through carbonation, pressurized carbonation, wet carbonation, nano silica (NS) pre-spraying and combined pressurized carbonation with NS pre-spraying, were utilized to improve the performance of recycled aggregate concrete (RAC). The characteristics of the stress–strain curves of RACs including peak stress, peak strain, elastic modulus, ultimate strain and toughness were evaluated after using the above RCA treatment techniques. A theoretical model for natural aggregate concrete was used to analyse the stress–strain curve

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11

Wang, Siyao, Jingtao Hu, Zhiyuan Sun, Yuan Gao, Xiao Yan, and Xiang Xue. "Efficiency and Mechanism of Surface Reinforcement for Recycled Coarse Aggregates via Magnesium Phosphate Cement." Materials 17, no. 1 (2023): 122. http://dx.doi.org/10.3390/ma17010122.

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Recycled aggregate concrete (RAC) exhibits inferior mechanical and durability properties owing to the deterioration of the recycled coarse aggregate (RCA) surface quality. To improve the surface properties of RCA, the reinforcement efficiency of RAC, and the maneuverability of the surface treatment method, this study used magnesium phosphate cement (MPC), a clinker-free low-carbon cement with excellent bonding properties, to precoat RCA under three-day pre-conditioning. Moreover, variable amounts of fly ash (FA) or granulated blast furnace slag (GBFS) were utilized to partly substitute MPC to

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12

Su, Qing. "Study on the frost resistance durability of recycled aggregate concrete under an extreme cold environment." Electronic Journal of Structural Engineering 22, no. 01 (2022): 29–36. http://dx.doi.org/10.56748/ejse.2231501.

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Recycled aggregate concrete (RAC), as a way to reuse waste concrete, is good for solving environmental and resource problems. In this paper, the frost resistance durability of RAC under an extreme cold environment was studied, RAC specimens with different replacement rates were designed, and then the indexes of the specimens, such as mass loss rate, were calculated and compared. It was found that with the progress of the freeze-thaw cycle, the higher the replacement rate of recycled concrete aggregate (RCA) was, the worse the frost resistance durability was. The mass loss rate of RAC-3 (100% R

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13

Ying, Jingwei, Zewen Han, Luming Shen, and Wengui Li. "Influence of Parent Concrete Properties on Compressive Strength and Chloride Diffusion Coefficient of Concrete with Strengthened Recycled Aggregates." Materials 13, no. 20 (2020): 4631. http://dx.doi.org/10.3390/ma13204631.

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Parent concrete coming from a wide range of sources can result in considerable differences in the properties of recycled coarse aggregate (RCA). In this study, the RCAs were obtained by crushing the parent concrete with water-to-cement ratios (W/Cparent) of 0.4, 0.5 and 0.6, respectively, and were strengthened by carbonation and nano-silica slurry wrapping methods. It was found that when W/Cparen was 0.3, 0.4 and 0.5, respectively, compared with the mortar in the untreated RCA, the capillary porosity of the mortar in the carbonated RCA decreased by 19%, 16% and 30%, respectively; the compressi

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14

Li, Zuo Shan, Li Hui Xie, Jun Ya Luo, and Xiang Chao Zhang. "The Mechanical Properties of Recycled Aggregate Concrete." Advanced Materials Research 671-674 (March 2013): 1852–55. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.1852.

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The experimental investigation of the preparation process of recycled aggregate concrete (RAC) using the waste concrete as recycled aggregate concrete (RCA) was reported. By conducting a series of laboratory experiments, the crushing and sieving procedure of wasted concrete to produce RCA were studied, the RACs with different strengths were designed, the strengths of hardened concrete were investigated. The results indicated that the representative strength for designing C10, C15 and C25 grade RAC using RCA were 11.3, 16.2 and 27.3 Mpa, respectively. The results gained in this study prove to b

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15

Ismail, Sallehan, and Mahyuddin Ramli. "Mechanical Properties of Concrete Using Treated Recycled Concrete Aggregate in Marine Environment." Key Engineering Materials 841 (May 2020): 138–43. http://dx.doi.org/10.4028/www.scientific.net/kem.841.138.

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This study also investigates the effectiveness of multiple surface modification of recycled concrete aggregate (RCA) with respect to mechanical properties of the resultant recycled aggregate concrete (RAC) when exposed to various curing conditions, namely, normal water (Nw) and seawater (Sw). The properties included compressive and flexural strength and impact resistance. Findings show that effect inclusion of the treated coarse RCA is significant in enhancing the mechanical properties of RAC. The exposure to Sw appears to affect the degradation of the compressive strength of RAC remarkably in

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16

Setkit, Monthian, Satjapan Leelatanon, Thanongsak Imjai, Reyes Garcia, and Suchart Limkatanyu. "Prediction of Shear Strength of Reinforced Recycled Aggregate Concrete Beams without Stirrups." Buildings 11, no. 9 (2021): 402. http://dx.doi.org/10.3390/buildings11090402.

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For decades, recycled coarse aggregate (RCA) has been used to make recycled aggregate concrete (RAC). Numerous studies have compared the mechanical properties and durability of recycled aggregate concrete (RAC) to those of natural aggregate concrete (NAC). However, test results on the shear strength of reinforced recycled aggregate concrete beams are still limited and sometimes contradictory. Shear failure is generally brittle and must be prevented. This article studies experimentally and analytically the shear strength of reinforced RAC beams without stirrups. Eight RAC beams and two controll

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17

Boudina, Tounsia, Dalila Benamara, and Rebih Zaitri. "Optimization of High-Performance-Concrete properties containing fine recycled aggregates using mixture design modeling." Frattura ed Integrità Strutturale 15, no. 57 (2021): 50–62. http://dx.doi.org/10.3221/igf-esis.57.05.

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This investigation means to predict and modeling the fresh and hardened concrete behavior containing fine aggregates from concrete and brick wastes, for different recycled aggregates substitution rates. To succeed this, the design of experiments DOE method was used. It is observed that slump of recycled concrete is significantly influenced by the content in recycled concrete aggregates (RCA), natural sand (NS) and recycled brick aggregates (RBA), respectively.The compressive strength (CS) reaches a maximum value of 83.48 MPa with factors values of 25% RBA, and 75% RCA. And HPC’s based on RBA s

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18

Peng, Gai-Fei, Yan-Zhu Huang, Hai-Sheng Wang, Jiu-Feng Zhang, and Qi-Bing Liu. "Mechanical Properties of Recycled Aggregate Concrete at Low and High Water/Binder Ratios." Advances in Materials Science and Engineering 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/842929.

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This paper presents an experimental research on mechanical properties of recycled aggregate concrete (RAC) at low and high water/binder (W/B) ratios. Concrete at two W/B ratios (0.255 and 0.586) was broken into recycled concrete aggregates (RCA). A type of thermal treatment was employed to remove mortar attached to RCA. The RAC at a certain (low or high) W/B ratio was prepared with RCA made from demolished concrete of the same W/B ratio. Tests were conducted on aggregate to measure water absorption and crushing values and on both RAC and natural aggregate concrete (NAC) to measure compressive

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19

Balakrishnan, Karthik, Michael J. Brenner, John W. Gosbee, and Cecelia E. Schmalbach. "Patient Safety/Quality Improvement Primer, Part II: Prevention of Harm Through Root Cause Analysis and Action (RCA2)." Otolaryngology–Head and Neck Surgery 161, no. 6 (2019): 911–21. http://dx.doi.org/10.1177/0194599819878683.

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With increasing emphasis on patient safety/quality improvement, health care systems are mirroring industry in the implementation of root cause analysis (RCA) for the identification and mitigation of errors. RCA uses a team approach with emphasis on the system, as opposed to the individual, to accrue empirical data on what happened and why. While many otolaryngologists have a broad understanding of RCA, practical experience is often lacking. Part II of this patient safety/quality improvement primer investigates the manner in which RCA is utilized in the prevention of medical errors. Attention i

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20

Solomon, Demetrius, Laura Wood, and Douglas Wiegmann. "Implementing A Human Factors Approach To Rca²: Analysis Of Resultant Safety Recommendations." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 65, no. 1 (2021): 628–32. http://dx.doi.org/10.1177/1071181321651265.

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Root Cause Analysis and Action (RCA2) guidelines offer fundamental improvements to traditional RCA. Yet, these guidelines lack robust methods to support a human factors analysis of patient harm events and the development of systems-level interventions. We previously described how human factors tools can be integrated into RCA2 to create a robust process called HFACS-RCA2. Prior analyses of qualitative data associated with an 18-month implementation project at a large academic health center indicated that HFACS-RCA2 fosters a more comprehensive human factors analysis of serious patient harm eve

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Hua, Minqi, Bo Chen, Yun Liu, et al. "Durability and Abrasion Resistance of Innovative Recycled Pervious Concrete with Recycled Coarse Aggregate of Different Quality under Sulfate Attack." Applied Sciences 11, no. 20 (2021): 9647. http://dx.doi.org/10.3390/app11209647.

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Construction and demolition wastes (C&DWs) have raised a large number of ecological and environmental problems. Recycling C&DWs into arecycled concrete aggregate (RCA) will help save natural resources effectively and reduce the negative impact of C&DW on the environment. Innovative pervious concrete (IPC) can mitigate extreme weather disasters, such as rainstorms, and overcome the low strength and poor durability of traditional pervious concrete. In this study, innovative recycled pervious concrete (IRPC) is prepared by combining RCA with IPC, which has broad application prospects

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22

Raisul, Islam Shuvo, Kanti Sarkar Razesh, Mehrab Mostak Md., and Sharmin Reza Chowdhury Dr. "Performance of Recycled Aggregate Concrete in Bangladesh Context: A Review." Journal of Building Construction 3, no. 2 (2021): 1–13. https://doi.org/10.5281/zenodo.5089441.

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Bangladesh is experiencing faster urbanization. Multi-storied building technology has become popular in urban areas due to fulfill urban housing demand in Bangladesh. The Government, manufacturers and stakeholders should explore proper approaches to reuse the building /construction wastes without aggravation to climate. The main objective of this study is to review the physical and mechanical properties of recycled coarse aggregate (RCA) and to compare these properties with that of natural aggregates. This review also focuses on the influence of RCA on Recycled Aggregate Concrete (RAC). It is

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23

Gong, Li, Xuelei Gong, Ying Liang, Zhiyuan Jia, and Yiqiang Li. "Experimental Study and Microscopic Analysis on Frost Resistance of Iron Ore Tailings Recycled Aggregate Concrete." Advances in Materials Science and Engineering 2022 (May 28, 2022): 1–16. http://dx.doi.org/10.1155/2022/8932229.

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Freeze-thaw harm is the major factor that reduces the durability of hydraulic concrete buildings at high altitudes and in cold regions. To solve the durability problem of hydraulic buildings in alpine regions, the study prepared sixteen groups of concrete specimens with different replacement ratios of iron ore tailings and recycled aggregate were prepared, and indoor deterioration accelerated tests were designed. Nuclear magnetic resonance (NMR) technology was used to analyze the pore distribution in the structure, and macro indicators of concrete mass loss rate and relative dynamic elastic mo

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24

Dharmadhikari, Suyog. "Review of Treatment Methods for Enhancing Recycled Concrete Aggregates Properties." International Journal for Research in Applied Science and Engineering Technology 12, no. 3 (2024): 2812–20. http://dx.doi.org/10.22214/ijraset.2024.59486.

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Abstract: The use of recycled concrete aggregates (RCA) as a potential substitute for natural aggregates in concrete production has been recommended by many research studies due to the environmental and cost benefits associated with it. However, due to RCA’s high-water absorption, its engineering properties are lower than natural aggregates (NA). Therefore, researchers have also suggested various pretreatment methods to enhance RCA's mechanical and durability properties, including thermal, mechanical, and chemical treatment. In this study, an attempt has been made to investigate the combined e

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Chen, Xue-Fei, Xiu-Cheng Zhang, and Guo-Hui Yan. "Multiscale Investigation of Modified Recycled Aggregate Concrete on Sulfate Attack Resistance." Materials 18, no. 7 (2025): 1450. https://doi.org/10.3390/ma18071450.

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This study investigated the sulfate resistance of modified recycled aggregate concrete (RAC) by applying carbonation and nano-silica soaking methodologies. Recycled concrete aggregates (RCA) derived from concretes of C30 and C60 strength grades were subjected to these modification techniques and subsequently utilized in the fabrication of RAC specimens. The results show notable porosity and crack density within the interfacial transition zone (ITZ) interfacing recycled aggregate and cement paste in recycled aggregate concrete (RAC). Specifically, the porosity within the ITZ of RAC is observed

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Hameed, Rashid, Muhammad Tahir, Safeer Abbas, Haseeb Ullah Sheikh, Syed Minhaj Saleem Kazmi, and Muhammad Junaid Munir. "Mechanical and Durability Characterization of Hybrid Recycled Aggregate Concrete." Materials 17, no. 7 (2024): 1571. http://dx.doi.org/10.3390/ma17071571.

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The recycling of construction and demolition waste (CDW) for the extraction of recycled concrete aggregates (RCAs) to be used to produce recycled aggregate concrete (RAC) is widely acknowledged internationally. However, CDW not only contains concrete debris but may also contain burnt clay bricks. The recycling of such CDW without the segregation of different components would result in recycled aggregates having different proportions of concrete and brick aggregates. The utilization of these aggregates in concrete requires a detailed investigation of their mechanical and durability properties.

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Yang, Jinsheng, Changyong Liu, Qinghe Wang, and Yue Geng. "Time-Dependent Behavior of Composite Steel–Recycled Aggregate Concrete Beams via Thermomechanical Finite Element Modeling." Buildings 12, no. 6 (2022): 756. http://dx.doi.org/10.3390/buildings12060756.

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This paper aims to investigate the impact of recycled coarse aggregate (RCA) on the time-dependent behavior of composite steel–recycled aggregate concrete (RAC) beams. The FE models of the composite beams were established, and a parametric study was conducted to obtain the primary factors. Furthermore, the design method for predicting the long-term deflection was proposed by including the shrinkage deflection component. The results showed that the RCA replacement ratio significantly influenced the long-term deflection of composite beams; the long-term deflection of composite beams with 100% RC

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Hou, Min, Lang Li, Jiang Feng Dong, and Qing Yuan Wang. "Influence of Amount of Recycled Coarse Aggregate on Mechanical Properties of Steel Tube Columns." Advanced Materials Research 647 (January 2013): 748–52. http://dx.doi.org/10.4028/www.scientific.net/amr.647.748.

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This paper presents the experimental results of recycled aggregate concrete filled steel tube columns prepared with different amount of recycled coarse aggregate (RCA) subjected to axial loading. The recycled coarse aggregates are obtained from the earthquake waste in Sichuan. Based on the studying of the physical and mechanical properties of recycled coarse aggregate, the mechanical property of recycled aggregate concrete (RAC) with five concrete mixes with 0%, 25%, 50%, 75% and 100% RCA respectively are prepared. The behaviour of the circular solid steel tube columns are studied in terms of

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Wei, Da, Pinghua Zhu, Shan Gao, Xiancui Yan, Hui Liu, and Haifeng Fan. "Comprehensive Evaluation of the Sustainability of Waste Concrete towards Structural Concrete Application in Freeze-Thaw Environment." Materials 15, no. 17 (2022): 6153. http://dx.doi.org/10.3390/ma15176153.

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To promote the in-situ and structural application of waste concrete in cold regions, the sustainable application potential of waste concrete in a freeze-thaw (F-T) environment was comprehensively evaluated from three aspects of performance, environmental load, and economic benefit. The recycled aggregate concrete (RAC) was produced by recycled coarse aggregate (RCA), which was obtained from the crushing of natural aggregate concrete (NAC) after every F-T 150 cycles until F-T failure. The effects of F-T damage of parent concrete on the physical properties of RCA and mechanical and frost resista

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Chen, Zongping, Ji Zhou, Peihuan Ye, and Ying Liang. "Analysis on Mechanical Properties of Recycled Aggregate Concrete Members after Exposure to High Temperatures." Applied Sciences 9, no. 10 (2019): 2057. http://dx.doi.org/10.3390/app9102057.

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In order to study the mechanical properties of recycled aggregate concrete (RAC) specimens after exposure to high temperatures, 120 RAC prism specimens, 57 reinforced recycled aggregate concrete (RRAC) specimens, and 56 steel reinforced recycled aggregate concrete (SRRAC) specimens were designed, involving two varying parameters such as recycled coarse aggregate (RCA) replacement percentage and temperature. The performance degradation of RCA materials, RRAC members, and SRRAC members after exposure to high temperatures was analyzed in depth. The research results show that after exposure to hig

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Santillán, L. R., F. Locati, Y. A. Villagrán-Zaccardi, and C. J. Zega. "Long-term sulfate attack on recycled aggregate concrete immersed in sodium sulfate solution for 10 years." Materiales de Construcción 70, no. 337 (2020): 212. http://dx.doi.org/10.3989/mc.2020.06319.

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The effect of recycled concrete aggregate (RCA) on concrete performance against external sulfate attack (ESA) is not yet fully known. In this paper, recycled aggregate concretes (RAC) with 0, 50, 75 and 100% of RCA contents were evaluated after 10 years of exposure immersed in 50g/l sodium sulfate solution. Sulfate ingress profiles were obtained by wet chemical analyses and FRX. Also, the mineralogy of the ingress profile was evaluated by thermogravimetric analyses. Finally, microcracking development in samples was evaluated by optical fluorescent microscopy image analysis. Although RAC showed

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Jagan, S., T. R. Neelakantan, and Saravana Kumar P. "Mechanical properties of recycled aggregate concrete surface treated by variation in mixing approaches." Revista de la construcción 20, no. 2 (2021): 236–48. http://dx.doi.org/10.7764/rdlc.20.2.236.

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Increased demand for natural aggregates (NA) due to infrastructural development has necessitated the use of alternative aggregates in the field of construction. One such option is the utilization of construction and demolition wastes, preferably named as recycled coarse aggregates (RCA) to produce a sustainable recycled aggregate concrete (RAC). Perhaps, the quality of RCA is usually poor due to the presence of adhered mortar on its surface affecting the strength and durability properties of RAC. Consequently, it is essential to improve the behavior of recycled aggregate concrete. In order to

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Zhang, Biao, Xueyuan Zhang, Mengyao Wang, Daoming Zhang, Dandan Wang, and Xinwu Ma. "Improvement in the Recycled Aggregate Replacement Ratio in Concrete Pavement Bricks by Incorporating Nano-Calcium Carbonate and Basalt Fibre: Model Experiment Investigation." Buildings 15, no. 12 (2025): 2070. https://doi.org/10.3390/buildings15122070.

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This study focuses on improving the recycled coarse aggregate (RCA) replacement ratio in recycled aggregate concrete products. First, the mix design and compressive performance of recycled aggregate concrete (RAC, RCA replacement percentages of 20%, 35%, and 50%) were evaluated using the monofactor analysis method and response surface methodology under three different conditions: single addition of nano-calcium carbonate (NC, dosages of 0.1%, 0.2%, and 0.3%), single addition of basalt fibre (BF, volume content of 0.1%, 0.2%, and 0.3%), and combined addition of both. The results show that the c

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Altun, Muhammet Gökhan, and Meral Oltulu. "Improving the impact resistance of recycled aggregate concretes with different types of fibers." Challenge Journal of Structural Mechanics 5, no. 1 (2019): 19. http://dx.doi.org/10.20528/cjsmec.2019.01.003.

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In this study, the aim was to use different types of fibers to improve the impact resistance of recycled aggregate concrete (RAC) that normally shows poor performance against mechanical impacts compared to normal concrete (NC). For this purpose, 18 groups of concrete were cast using different parameters. The study examined different types of concrete mixtures where the proportion of RCA (recycled coarse aggregate) used was 30% and 50% respectively, and where steel fiber-reinforcement was used in proportions of 1% and 2%, and polypropylene fiber-reinforcement was used in proportions of 0.1%. Wh

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Hołda, Jakub, Katarzyna Słodowska, Marcin Strona, et al. "Mutual Arrangements of Coronary Blood Vessels within the Right Atrial Appendage Vestibule." Journal of Clinical Medicine 10, no. 16 (2021): 3588. http://dx.doi.org/10.3390/jcm10163588.

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Background: The aim of our study was to investigate the presence and mutual relationships of coronary vessels within the right atrial appendage (RAA) vestibule. Methods: We examined 200 autopsied hearts. The RAA vestibule was cross-sectioned along its isthmuses (superior, middle, and inferior). Results: The right coronary artery (RCA) was present in 100% of the superior RAA isthmuses but absent in 2.0% of hearts within the middle isthmus and in 6.5% of hearts within the inferior RAA isthmus. Its diameter was quite uniform along the superior (2.6 ± 0.8 mm), middle (2.9 ± 1.1 mm), and inferior (

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Husnah, H. D. Setio, I. S. Darma, and P. Kusumaningrum. "Behavior of using recycled concrete aggregate on concrete compressive strength." IOP Conference Series: Earth and Environmental Science 1510, no. 1 (2025): 012087. https://doi.org/10.1088/1755-1315/1510/1/012087.

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Abstract The high demand for natural aggregates as concrete mixtures can cause ecological imbalance. Concrete waste can be reused as aggregate material in new construction. Recycled concrete aggregates (RCA) are disturbed due to crushing, resulting in weakening of the original aggregate or attached mortar, but there is a possibility of having the potential for unhydrated cement grains (UCG). Water from the new mixture is expected to revive the hydration potential in the RCA so that the Interfacial transition zone (ITZ) area is reduced and the quality of the old mortar is increased for use in n

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Younis, Khaleel H., Abdulfattah A. Amin, Hemin G. Ahmed, and Shelan M. Maruf. "Recycled Aggregate Concrete including Various Contents of Metakaolin: Mechanical Behavior." Advances in Materials Science and Engineering 2020 (December 17, 2020): 1–17. http://dx.doi.org/10.1155/2020/8829713.

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This experimental research investigates the effect of utilizing metakaolin (MK) on the behavior of recycled aggregate concrete (RAC). The RAC incorporates recycled coarse aggregate (RCA) originated from crushing construction and demolition waste. The investigated parameters were RCA and MK contents. Tests of workability and mechanical properties such as compressive strength, splitting tensile strength, flexural strength, and modulus of elasticity were conducted to evaluate the influence of MK on workability and mechanical behavior of RAC. In total, 19 mixes were prepared. These mixes are divid

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Gao, Pengfei, Jian Wang, Bo Chen, Mingxin Bai, and Yuanyuan Song. "Experimental Study on the Characteristics of Corrosion-Induced Cracks and Steel Corrosion Depth of Carbonated Recycled Aggregate Concrete Beams." Buildings 14, no. 12 (2024): 3889. https://doi.org/10.3390/buildings14123889.

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The durability of carbonated recycled aggregate concrete (C-RAC) beams is still unclear at present. In this paper, the characteristics of corrosion-induced cracks and the steel corrosion depth of C-RAC beams were investigated through the accelerated corrosion test. The results showed that when accelerating corrosion to the 40th day, compared to the non-carbonated recycled aggregate concrete (NC-RAC) beam, the corrosion-induced cracking area of the C-RAC beam with a 100% carbonated recycled coarse aggregate (C-RCA) replacement ratio decreased by 40.00%, while the total length of the corrosion-i

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Gao, Qi, Zhiming Ma, Jianzhuang Xiao, and Fuan Li. "Effects of Imposed Damage on the Capillary Water Absorption of Recycled Aggregate Concrete." Advances in Materials Science and Engineering 2018 (October 8, 2018): 1–12. http://dx.doi.org/10.1155/2018/2890931.

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Capillary water absorption of concrete is closely related to its pore structure, permeability, and durability. This paper intensively investigates the effects of imposed damage, including freeze-thaw damage and loading damage, on the capillary water absorption of recycled aggregate concrete (RAC). Freeze-thaw cycle test, loading test, and the experiment of capillary water absorption were carried out, respectively. The results demonstrate that the addition of recycled coarse aggregate (RCA) results in the increase in the capillary absorption behavior of RAC without imposed damage, and there exi

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Ye, Taoping, Wanlin Cao, Yixuan Zhang, and Zhengwen Yang. "Flexural Behavior of Corroded Reinforced Recycled Aggregate Concrete Beams." Advances in Materials Science and Engineering 2018 (2018): 1–14. http://dx.doi.org/10.1155/2018/2957036.

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Recycling concrete not only reduces the use of virgin aggregate but also decreases the pressure on landfills. As a result, recycled coarse aggregate (RCA) is extensively recommended for new construction projects. However, the flexural behavior of corroded reinforced recycled aggregate concrete (RAC) beams is uncertain. The experimental research presented in this paper was performed to investigate the flexural behavior of corroded reinforced RAC beams compared to that of corroded reinforced natural aggregate concrete (NAC) beams and consequently explore the possibility of using RAC beams in cor

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Shahab, Manzar, and Noorul Bashar. "Effect of silica fume on strength of recycled aggregate concrete." International Journal of Research in Engineering and Innovation 08, no. 03 (2024): 101–7. http://dx.doi.org/10.36037/ijrei.2024.8301.

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The present study deals with investigating the effects of using coarse recycled concrete aggregates (RCA) on compression & split-tensile resilience of M25 grade concrete mixes. Five different mixes of modified recycle aggregate concrete (RAC) were designed and prepared considering replacement proportion of normal coarse aggregates as 0, 25, 50, 75, and 100 % with RCA. The specimens were prepared according to Indian standard codal provisions and experimentally tested for its mechanical characteristics in laboratory conditions. A steep degradation in compressive and tensile strength on incre

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Ismail, Sallehan, Wan Nur Syazwani Wan Mohammad, and Mahyuddin Ramli. "Diversified Production of Recycled Aggregate Concrete Mixture with the Addition of Single and Hybrid Fibers." International Journal of Engineering & Technology 7, no. 3.11 (2018): 147. http://dx.doi.org/10.14419/ijet.v7i3.11.15950.

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The low strength property of recycled concrete aggregates (RCAs) limits its widespread application in the production of high-strength recycled aggregate concrete (RAC). In this study, RCA properties were improved prior to its incorporation into an RAC mixture through surface treatment. This mixture was subsequently diversified considering the benefits of adding various fiber-reinforced systems to enhance RAC performance. Two types of short discrete synthetic fibers, namely, polyolefin and polypropylene, were added in single and hybrid forms. This study aimed to investigate the effectiveness of

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Madhu, K. A., V. Manoj, and H. N. Rajakumara. "Performance of Concrete made with Natural Aggregate and Multi-cycle Recycled Concrete Aggregate." IOP Conference Series: Materials Science and Engineering 1255, no. 1 (2022): 012019. http://dx.doi.org/10.1088/1757-899x/1255/1/012019.

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Abstract The research concentrated on the use of concrete demolition waste (CDW) to achieve long sustainability, as coarse aggregate in the production of Recycled aggregate concrete (RAC). Concrete demolition waste (RCA) is used to replace natural coarse aggregates (NCA) in M-25 grade concrete production, preserving natural resources and reducing the amount of demolition waste that must be landfilled. The effect of substituting 25%, 50%, and 100% NCA with three cycles of RCA on the mechanical characteristics with an endurance of hardened concrete was studied and compared to control concrete. T

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Ying, Li Ping, and Yi Jiang Peng. "Effects of Recycled Aggregate Replacement Rate on Compression Mechanical Behavior of Concrete Based on Base Force Element Method." Key Engineering Materials 894 (July 27, 2021): 121–26. http://dx.doi.org/10.4028/www.scientific.net/kem.894.121.

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A meso-analysis method which is derived from the base force element method (BFEM) was proposed for recycled aggregate concrete (RAC). A simple algorithm was used to generate the convex recycled concrete aggregate (RCA) model. Uniaxial compression numerical simulations were carried out on the numerical specimens with different replacement rates of RCA. The model predictions were in a good agreement with the test results. The proposed method is very promising. It can totally predict the full stress-strain curve of RAC, as well as the failure process and failure mode, including strain softening a

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Hu, Xiaobin, Qinwang Lu, and Shanshan Cheng. "Uniaxial Damaged Plastic Constitutive Relation of Recycled Aggregate Concrete." Advances in Materials Science and Engineering 2019 (March 10, 2019): 1–16. http://dx.doi.org/10.1155/2019/2982195.

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This paper presents a proposed uniaxial damaged plastic constitutive relation of recycled aggregate concrete (RAC) based on the experimental studies. A total of five groups of RAC specimens with different recycled coarse aggregate (RCA) replacement percentages of 0, 25%, 50%, 75%, and 100%, respectively, are tested under both monotonic loading and cyclic loading. The effect of the RCA replacement percentage is thoroughly investigated on a variety of mechanical properties, including the compressive strength, the peak strain, and the elastic modulus. Based on the test results, a uniaxial damage

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Deepika, Patel, and Rathore Harsh. "Effect of Recycled Concrete Aggregate Replacement Ratio on the Compressive Strength of M60 Grade Concrete." Journal of Advances in Civil Engineering and Management 7, no. 1 (2024): 29–37. https://doi.org/10.5281/zenodo.10682793.

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<em>The compressive strength of M60 Grade Concrete incorporating Recycled Concrete Aggregate (RCA) at varying replacement ratios was investigated in this study. Two sets of data were analyzed: the first set presents compressive strength values after 7 and 28 days of curing for replacement ratios ranging from 0% to 100%, while the second set provides compressive strength values for different curing durations (28, 56, and 90 days) for specific RAC types. The findings reveal a clear trend of decreasing compressive strength as the RCA replacement ratio increases, with a significant drop beyond a 5

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Liu, K., J. Yan, and C. Zou. "Behaviour of recycled aggregate concrete under combined compression and shear stresses." Materiales de Construcción 68, no. 331 (2018): 162. http://dx.doi.org/10.3989/mc.2018.06217.

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To investigate the behaviour of recycled aggregate concrete (RAC) under combined compression and shear stresses, 75 hollow cylinder specimens prepared with various replacement ratios of recycled coarse aggregate (RCA) were tested with a self-designed loading device. The results showed that the failure pattern was similar for RAC with different replacement ratios of RCA. The ultimate shear stress improved with an increasing axial compression ratio of less than 0.6 and declined after exceeding 0.6. A modified failure criterion for RAC with normal strength under combined compression and shear str

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Yang, Xiaolong, Yusong Liu, Junlin Liang, et al. "Straightening methods for RCA and RAC—a review." Cement and Concrete Composites 141 (August 2023): 105145. http://dx.doi.org/10.1016/j.cemconcomp.2023.105145.

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Liotta, Marc Antonio, Marco Viviani, and Carlotta Rodriquez. "Structural Concrete with Recycled Aggregate: Advances in Mechanical Properties, Durability and Sustainability." Applied Mechanics and Materials 847 (July 2016): 553–58. http://dx.doi.org/10.4028/www.scientific.net/amm.847.553.

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A large number of tests has been carried out in the last 15 years all around the world to study the possibility to use recycled concrete aggregates (RCA) to produce structural concrete.Earlier tests indicated that RCA concrete had lower properties in comparison to ordinary concrete, such as lower elastic modulus, a more brittle post-elastic behavior, lower workability, higher shrinkage and creep.Most of these issues have been addressed to the content of cement mortar remaining in adhesion to the aggregate after the recycling processes and that cannot be totally eliminated without high economic

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Kaushik, Sankalp, and Pravindra Singh Bhan. "Chemical Modifications of Recycled Concrete Aggregate." International Journal of Emerging Science and Engineering 12, no. 7 (2024): 7–12. http://dx.doi.org/10.35940/ijese.g9900.12060724.

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The necessity for environmental sustainability has prompted the utilization of recycled concrete aggregates (RCA) sourced from structural demolition sites for the production of recycled aggregate concrete (RAC). The primary element impacting the quality of recycled concrete aggregate (RCA) is the mortar paste that adheres to the natural aggregate (NA). The cement mortar adhered to recycled concrete aggregate exhibits higher porosity and water absorption levels, along with reduced strength compared to natural aggregate. These characteristics negatively impact both the mechanical properties and

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