Treatment Methods for the Quality Improvement of Recycled Concrete Aggregate (RCA) - A Review

Abstract

for the purpose of providing references for further research and practical application about the quality improvement of RCA, in this paper, various treatment methods were firstly classified into four categories: removing old mortar (OM), strengthening OM, multi-stage mixing methods, and combination methods. Thereafter, the improvement mechanisms and important conclusions of various treatment methods were elucidated and summarised respectively. In the section of discussion, the improved effects as well as advantages and disadvantages of various treatment methods were compared and discussed respectively, and recommendations for the selection of treatment methods were proposed. Finally, the further research directions were pointed out, and an integrative programme on the quality improvement of RCA was recommended.

Keywords

RCA / treatment methods / removing OM / strengthening OM / interfacial transition zone (ITZ)

References

[1] Vegas I, Broos K, Nielsen P, et al. Upgrading the Quality of Mixed Recycled Aggregates from Construction and Demolition Waste by Using Near-Infrared Sorting Technology[J]. Constr. Build. Mater., 2015, 75: 121-128.

[2] Evangelista L, de Brito J. Concrete with Fine Recycled Aggregates: A Review[J]. Eur. J. Environ. Civ. Eng., 2013, 18(2): 129-172.

[3] Yue G B, Zhang P, Li Q Y, et al. Performance Analysis of a Recycled Concrete Interfacial Transition Zone in a Rapid Carbonization Environment[J]. Adv. Mater. Sci. Eng., 2018, 2018: 1-8.

[4] Liu Z, Peng H, Cai C S. Mesoscale Analysis of Stress Distribution along ITZs in Recycled Concrete with Variously Shaped Aggregates under Uniaxial Compression[J]. J. Mater. Civ. Eng., 2015, 27(11): 04 015 024

[5] Zhao Y X, Zhang H R. Integrated Interface Parameters of Recycled Aggregate Concrete[J]. Constr. Build. Mater., 2015, 101: 861-877.

[6] Poon C S, Shui Z H, Lam L. Effect of Microstructure of ITZ on Compressive Strength of Concrete Prepared with Recycled Aggregates[J]. Constr. Build. Mater., 2004, 18(6): 461-468.

[7] de Juan M S, Gutiérrez P A. Study on the Influence of Attached Mortar Content on the Properties of Recycled Concrete Aggregate[J]. Constr. Build. Mater., 2009, 23(2): 872-877.

[8] Akbarnezhad A, Ong K C G, Zhang M H, et al. Acid Treatment Technique for Determining the Mortar Content of Recycled Concrete Aggregates[J]. J. Test. Eval., 2013, 41(3): 20 120 026

[9] Limbachiya M C. Recycled Aggregates: Production, Properties and Value-Added Sustainable Applications[J]. J. Wuhan Univ. Technol.-Mater. Sci. Ed., 2010, 25(6): 1 011-1 016.

[10] Katkhuda H, Shatarat N. Improving the Mechanical Properties of Recycled Concrete Aggregate Using Chopped Basalt Fibers and Acid Treatment[J]. Constr. Build. Mater., 2017, 140: 328-335.

[11] Zhu Y G, Kou S C, Poon C S, et al. Influence of Silane-Based Water Repellent on the Durability Properties of Recycled Aggregate Concrete[J]. Cem. Concr. Compos., 2013, 35(1): 32-38.

[12] Ren X, Zhang L Y. Experimental Study of Interfacial Transition Zones between Geopolymer Binder and Recycled Aggregate[J]. Constr. Build. Mater., 2018, 167: 749-756.

[13] Djerbi A. Effect of Recycled Coarse Aggregate on the New Interfacial Transition Zone Concrete[J]. Constr. Build. Mater., 2018, 190: 1 023-1 033.

[14] Wang C H, Xiao J Z, Zhang G Z, et al. Interfacial Properties of Modeled Recycled Aggregate Concrete Modified by Carbonation[J]. Constr. Build. Mater., 2016, 105: 307-320.

[15] Dimitriou G, Savva P, Petrou M F. Enhancing Mechanical and Durability Properties of Recycled Aggregate Concrete[J]. Constr. Build. Mater., 2018, 158: 228-235.

[16] Otsuki N, Miyazato S I, Yodsudjai W. Influence of Recycled Aggregate on Interfacial Transition Zone, Strength, Chloride Penetration and Carbonation of Concrete[J]. J. Mater. Civ. Eng., 2003, 15(5): 443-451.

[17] Ryu J S. Improvement on Strength and Impermeability of Recycled Concrete Made from Crushed Concrete Coarse Aggregate[J]. J. Mater. Sci. Lett., 2002, 21: 1 565-1 567.

[18] Ryu J S. An Experimental Study on the Effect of Recycled Aggregate on Concrete Properties[J]. Mag. Concr. Res., 2002, 54(1): 7-12.

[19] Xiao J Z, Li W G, Sun Z H, et al. Properties of Interfacial Transition Zones in Recycled Aggregate Concrete Tested by Nanoindentation[J]. Cem. Concr. Compos., 2013, 37: 276-292.

[20] Medina C, Zhu W Z, Howind T, et al. Influence of Interfacial Transition Zone on Engineering Properties of the Concrete Manufactured with Recycled Ceramic Aggregate[J]. J. Civ. Eng. Manage., 2014, 21(1): 83-93.

[21] Sáez del Bosque I F, Zhu W, Howind T, et al. Properties of Interfacial Transition Zones (ITZs) in Concrete Containing Recycled Mixed Aggregate[J]. Cem. Concr. Compos., 2017, 81: 25-34.

[22] Shi C J, Li Y K, Zhang J K, et al. Performance Enhancement of Recycled Concrete Aggregate - A Review[J]. J. Cleaner Prod., 2016, 112: 466-472.

[23] Shaban W M, Yang J, Su H L, et al. Quality Improvement Techniques for Recycled Concrete Aggregate: A Review[J]. J. Adv. Concr. Technol., 2019, 17: 151-167.

[24] Tam V W Y, Tam C M, Le K N. Removal of Cement Mortar Remains from Recycled Aggregate Using Pre-soaking Approaches[J]. Resour., Conserv. Recycl., 2007, 50(1): 82-101.

[25] Li W G, Xiao J Z, Sun Z H, et al. Interfacial Transition Zones in Recycled Aggregate Concrete with Different Mixing Approaches[J]. Constr. Build. Mater., 2012, 35: 1 045-1 055.

[26] Xuan D X, Zhan B J, Poon C S. Assessment of Mechanical Properties of Concrete Incorporating Carbonated Recycled Concrete Aggregates[J]. Cem. Concr. Compos., 2016, 65: 67-74.

[27] Xuan D X, Zhan B J, Poon C S. Durability of Recycled Aggregate Concrete Prepared with Carbonated Recycled Concrete Aggregates[J]. Cem. Concr. Compos., 2017, 84: 214-221.

[28] Katz A. Treatments for the Improvement of Recycled Aggregate[J]. J. Mater. Civ. Eng., 2004, 16(6): 597-603.

[29] Kang H C, Kee S H. Improving the Quality of Mixed Recycled Coarse Aggregates from Construction and Demolition Waste Using Heavy Media Separation with Fe3O4 Suspension[J]. Adv. Mater. Sci. Eng., 2017, 2017: 1-12.

[30] Tsujino M, Noguchi T, Tamura M, et al. Application of Conventionally Recycled Coarse Aggregate to Concrete Structure by Surface Modification Treatment[J]. J. Adv. Concr. Technol., 2007, 5(1): 13-25.

[31] Nagataki S, Gokce A, Saeki T, et al. Assessment of Recycling Process Induced Damage Sensitivity of Recycled Concrete Aggregates[J]. Cem. Concr. Res., 2004, 34(6): 965-971.

[32] Li J S, Xiao H N, Zhou Y. Influence of Coating Recycled Aggregate Surface with Pozzolanic Powder on Properties of Recycled Aggregate Concrete[J]. Constr. Build. Mater., 2009, 23(3): 1 287-1 291.

[33] Pedro D, de Brito J, Evangelista L. Performance of Concrete Made with Aggregates Recycled from Precasting Industry Waste: Influence of the Crushing Process[J]. Mater Struct., 2015, 48(12): 3 965-3 978.

[34] Akbarnezhad A, Ong K C G, Tam C T, et al. Effects of the Parent Concrete Properties and Crushing Procedure on the Properties of Coarse Recycled Concrete Aggregates[J]. J. Mater. Civ. Eng., 2013, 25(12): 1 795-1 802.

[35] Ulsen C, Tseng E, Angulo S C, et al. Concrete Aggregates Properties Crushed by Jaw and Impact Secondary Crushing[J]. J. Mater. Res. Technol., 2019, 8(1): 494-502.

[36] Toshio Y, Yukio K, Kunio Y, et al. A Study on a Technology for Producing High Quality Recycled Coarse Aggregate[J]. J. Soc. Mater. Sci., Jpn., 2001, 50(8): 835-842.

[37] Ogawa H, Nawa T. Improving the Quality of Recycled Fine Aggregates by Selective Removal of Brittleness Defects[J]. J. Adv. Concr. Technol., 2012, 10: 395-410.

[38] Noguchi T, Kitagaki R, Tsujino M. Minimizing Environmental Impact and Maximizing Performance in Concrete Recycling[J]. Struct. Concr., 2011, 12(1): 36-46.

[39] Wang L, Wang J L, Qian X, et al. An Environmentally Friendly Method to Improve the Quality of Recycled Concrete Aggregates[J]. Constr. Build. Mater., 2017, 144: 432-441.

[40] Saravanakumar P, Abhiram K, Manoj B. Properties of Treated Recycled Aggregates and Its Influence on Concrete Strength Characteristics[J]. Constr. Build. Mater., 2016, 111: 611-617.

[41] Kim H S, Kim B I, Kim K S, et al. Quality Improvement of Recycled Aggregates Using the Acid Treatment Method and the Strength Characteristics of the Resulting Mortar[J]. J. Mater. Cycles Waste Manage., 2017, 19(2): 968-976.

[42] Güneyisi E, Gesoğlu M, Algın Z, et al. Effect of Surface Treatment Methods on the Properties of Self-compacting Concrete with Recycled Aggregates[J]. Constr. Build. Mater., 2014, 64: 172-183.

[43] Radevic A, Despotovic I, Zakic D, et al. Influence of Acid Treatment and Carbonation on the Properties of Recycled Concrete Aggregate[J]. Chem. Ind. Chem. Eng. Q., 2018, 24(1): 23-30.

[44] Al-Bayati H K A, Das P K, Tighe S L, et al. Evaluation of Various Treatment Methods for Enhancing the Physical and Morphological Properties of Coarse Recycled Concrete Aggregate[J]. Constr. Build. Mater., 2016, 112: 284-298.

[45] Ismail S, Ramli M. Mechanical Strength and Drying Shrinkage Properties of Concrete Containing Treated Coarse Recycled Concrete Aggregates[J]. Constr. Build. Mater., 2014, 68: 726-739.

[46] Ismail S, Ramli M. Engineering Properties of Treated Recycled Concrete Aggregate (RCA) for Structural Applications[J]. Constr. Build. Mater., 2013, 44: 464-476.

[47] Kazemian F, Rooholamini H, Hassani A. Mechanical and Fracture Properties of Concrete Containing Treated and Untreated Recycled Concrete Aggregates[J]. Constr. Build. Mater., 2019, 209: 690-700.

[48] Bui N K, Satomi T, Takahashi H. Mechanical Properties of Concrete Containing 100% Treated Coarse Recycled Concrete Aggregate[J]. Constr. Build. Mater., 2018, 163: 496-507.

[49] Spaeth V, Djerbi Tegguer A. Polymer Based Treatments Applied on Recycled Concrete Aggregates[J]. Adv. Mater. Res., 2013, 687: 514-519.

[50] Spaeth V, Djerbi Tegguer A. Improvement of Recycled Concrete Aggregate Properties by Polymer Treatments[J]. Int. J. Sustainable Built. Environ., 2013, 2(2): 143-152.

[51] Kou S C, Poon C S. Properties of Concrete Prepared with PVA-Impregnated Recycled Concrete Aggregates[J]. Cem. Concr. Compos., 2010, 32(8): 649-654.

[52] Wang F X, Lv Y, Li G Z. Study on the Microstructure of RFA Cement Mortar after Modification[J]. Appl. Mech. Mater., 2014, 540: 229-232.

[53] Yaowarat T, Horpibulsuk S, Arulrajah A, et al. Compressive and Flexural Strength of Polyvinyl Alcohol-Modified Pavement Concrete Using Recycled Concrete Aggregates[J]. J. Mater. Civ. Eng., 2018, 30(4): 04 018 046

[54] Wan H W, Yang L Y, Shui Z H. Modificatin of ITZ Structure and Properties of Regenerated Concrete[J]. J. Wuhan Univ. Technol.-Mater. Sci. Ed., 2006, 21(2): 128-132.

[55] Ho H L, Huang R, Lin W T, et al. Pore-Structures and Durability of Concrete Containing Pre-coated Fine Recycled Mixed Aggregates Using Pozzolan and Polyvinyl Alcohol Materials[J]. Constr. Build. Mater., 2018, 160: 278-292.

[56] Hwang E H, Ko Y S, Jeon J K. Effect of Polymer Cement Modifiers on Mechanical and Physical Properties of Polymer-Modified Mortar Using Recycled Artificial Marble Waste Fine Aggregate[J]. J. Ind. Eng. Chem., 2008, 14(2): 265-271.

[57] Ryou J S, Lee Y S. Characterization of Recycled Coarse Aggregate (RCA) via a Surface Coating Method[J]. Int. J. Concr. Struct. Mater., 2014, 8(2): 165-172.

[58] Santos W F, Quattrone M, John V M, et al. Roughness, Wettability and Water Absorption of Water Repellent Treated Recycled Aggregates[J]. Constr. Build. Mater., 2017, 146: 502-513.

[59] Zhao Z H, Wang S D, Lu L C, et al. Evaluation of Pre-coated Recycled Aggregate for Concrete and Mortar[J]. Constr. Build. Mater., 2013, 43: 191-196.

[60] Junak J, Sicakova A. Effect of Surface Modifications of Recycled Concrete Aggregate on Concrete Properties[J]. Buildings, 2018, 8(2): 1-11.

[61] Du T, Li H Q, Wu X G, et al. The Compression-Deformation Behaviour of Concrete with Various Modified Recycled Aggregates[J]. J. Wuhan Univ. Technol.-Mater. Sci. Ed., 2005, 20(2): 127-129.

[62] Lee C H, Du J C, Shen D H. Evaluation of Pre-coated Recycled Concrete Aggregate for Hot Mix Asphalt[J]. Constr. Build. Mater., 2012, 28(1): 66-71.

[63] Zhang H R, Zhao Y X, Meng T, et al. Surface Treatment on Recycled Coarse Aggregates with Nanomaterials[J]. J. Mater. Civ. Eng., 2016, 28(2): 04 015 094

[64] Younis K H, Mustafa S M. Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete[J]. Adv. Mater. Sci. Eng., 2018, 2018: 1-11.

[65] Singh L P, Bisht V, Aswathy M S, et al. Studies on Performance Enhancement of Recycled Aggregate by Incorporating Bio and Nano Materials[J]. Constr. Build. Mater., 2018, 181: 217-226.

[66] Zhang J K, Shi C J, Li Y K, et al. Performance Enhancement of Recycled Concrete Aggregates through Carbonation[J]. J. Mater. Civ. Eng., 2015, 27(11): 04 015 029

[67] Luo S R, Ye S C, Xiao J Z, et al. Carbonated Recycled Coarse Aggregate and Uniaxial Compressive Stress-Strain Relation of Recycled Aggregate Concrete[J]. Constr. Build. Mater., 2018, 188: 956-965.

[68] Zhan B J, Xuan D X, Poon C S. Enhancement of Recycled Aggregate Properties by Accelerated CO₂ Curing Coupled with Limewater Soaking Process[J]. Cem. Concr. Compos., 2018, 89: 230-237.

[69] Li L, Xiao J Z, Xuan D X, et al. Effect of Carbonation of Modeled Recycled Coarse Aggregate on the Mechanical Properties of Modeled Recycled Aggregate Concrete[J]. Cem. Concr. Compos., 2018, 89: 169-180.

[70] Zhan B J, Poon C S, Shi C J. Materials Characteristics Affecting CO₂ Curing of Concrete Blocks Containing Recycled Aggregates[J]. Cem. Concr. Compos., 2016, 67: 50-59.

[71] Zhan B J, Xuan D X, Poon C S, et al. Effect of Curing Parameters on CO₂ Curing of Concrete Blocks Containing Recycled Aggregates[J]. Cem. Concr. Compos., 2016, 71: 122-130.

[72] Zhan B J, Poon C S, Shi C J. CO₂ Curing for Improving the Properties of Concrete Blocks Containing Recycled Aggregates[J]. Cem. Concr. Compos., 2013, 42: 1-8.

[73] Zhan B J, Poon C S, Liu Q, et al. Experimental Study on CO₂ Curing for Enhancement of Recycled Aggregate Properties[J]. Constr. Build. Mater., 2014, 67: 3-7.

[74] Zhang J K, Shi C J, Li Y K, et al. Influence of Carbonated Recycled Concrete Aggregate on Properties of Cement Mortar[J]. Constr. Build. Mater., 2015, 98: 1-7.

[75] Pan G H, Zhan M M, Fu M H, et al. Effect of CO₂ Curing on Demolition Recycled Fine Aggregates Enhanced by Calcium Hydroxide Pre-soaking[J]. Constr. Build. Mater., 2017, 154: 810-818.

[76] Tam V W Y, Butera A, Le K N. Carbon-Conditioned Recycled Aggregate in Concrete Production[J]. J. Cleaner Prod., 2016, 133: 672-680.

[77] Kou S C, Zhan B J, Poon C S. Use of a CO₂ Curing Step to Improve the Properties of Concrete Prepared with Recycled Aggregates[J]. Cem. Concr. Compos., 2014, 45: 22-28.

[78] De Muynck W, De Belie N, Verstraete W. Microbial Carbonate Precipitation in Construction Materials: A Review[J]. Ecol. Eng., 2010, 36(2): 118-136.

[79] Vijay K, Murmu M, Deo S V. Bacteria Based Self Healing Concrete - A Review[J]. Constr. Build. Mater., 2017, 152: 1 008-1 014.

[80] Seifan M, Berenjian A. Application of Microbially Induced Calcium Carbonate Precipitation in Designing Bio Self-healing Concrete[J]. World J. Microbiol. Biotechnol., 2018, 34(11): 168

[81] Joshi S, Goyal S, Mukherjee A, et al. Microbial Healing of Cracks in Concrete: A Review[J]. J. Ind. Microbiol. Biotechnol., 2017, 44(11): 1 511-1 525.

[82] Sahoo K K, Arakha M, Sarkar P, et al. Enhancement of Properties of Recycled Coarse Aggregate Concrete Using Bacteria[J]. Int. J. Smart Nano Mater., 2016, 7(1): 22-38.

[83] Grabiec A M, Klama J, Zawal D, et al. Modification of Recycled Concrete Aggregate by Calcium Carbonate Biodeposition[J]. Constr. Build. Mater., 2012, 34: 145-150.

[84] García-González J, Rodríguez-Robles D, Wang J Y, et al. Quality Improvement of Mixed and Ceramic Recycled Aggregates by Biodeposition of Calcium Carbonate[J]. Constr. Build. Mater., 2017, 154: 1 015-1 023.

[85] Wong L S. Microbial Cementation of Ureolytic Bacteria from the Genus Bacillus: A Review of the Bacterial Application on Cement-Based Materials for Cleaner Production[J]. J. Cleaner Prod., 2015, 93: 5-17.

[86] Siddique R, Chahal N K. Effect of Ureolytic Bacteria on Concrete Properties[J]. Constr. Build. Mater., 2011, 25(10): 3 791-3 801.

[87] Pan Z Y, Li G Y, Hong C Y, et al. Modified Recycled Concrete Aggregates for Asphalt Mixture Using Microbial Calcite Precipitation[J]. RSC Adv., 2015, 5(44): 34 854-34 863.

[88] Wang J Y, Vandevyvere B, Vanhessche S, et al. Microbial Carbonate Precipitation for the Improvement of Quality of Recycled Aggregates[J]. J. Cleaner Prod., 2017, 156: 355-366.

[89] Wu C R, Zhu Y G, Zhang X T, et al. Improving the Properties of Recycled Concrete Aggregate with Bio-deposition Approach[J]. Cem. Concr. Compos., 2018, 94: 248-254.

[90] Tam V W Y, Gao X F, Tam C M. Microstructural Analysis of Recycled Aggregate Concrete Produced from Two-Stage Mixing Approach[J]. Cem. Concr. Res., 2005, 35(6): 1 195-1 203.

[91] Kong D Y, Lei T, Zheng J Y, et al. Effect and Mechanism of Surface-Coating Pozzalanics Materials Around Aggregate on Properties and ITZ Microstructure of Recycled Aggregate Concrete[J]. Constr. Build. Mater., 2010, 24(5): 701-708.

[92] Liang Y C, Ye Z M, Vernerey F, et al. Development of Processing Methods to Improve Strength of Concrete with 100% Recycled Coarse Aggregate[J]. J. Mater. Civ. Eng., 2015, 27(5): 04 014 163

[93] Tam V W Y, Tam C M. Assessment of Durability of Recycled Aggregate Concrete Produced by Two-Stage Mixing Approach[J]. J. Mater. Sci., 2007, 42(10): 3 592-3 602.

[94] Rajhans P, Gupta P K, Kumar R R, et al. EMV Mix Design Method for Preparing Sustainable Self Compacting Recycled Aggregate Concrete Subjected to Chloride Environment[J]. Constr. Build. Mater., 2019, 199: 705-716.

[95] Urban K, Sicakova A. The Influence of Kind of Coating Additive on the Compressive Strength of RCA-Based Concrete Prepared by Triple-Mixing Method[C]. In: 1st International Conference on Advances in Environmental Engineering (AEE 2017), 2017

[96] Tam V W Y, Tam C M, Wang Y. Optimization on Proportion for Recycled Aggregate in Concrete Using Two-Stage Mixing Approach[J]. Constr. Build. Mater., 2007, 21(10): 1 928-1 939.

[97] Tam V W Y, Tam C M. Diversifying Two-Stage Mixing Approach (TSMA) for Recycled Aggregate Concrete: TSMAs and TSMAsc[J]. Constr. Build. Mater., 2008, 22(10): 2 068-2 077.

[98] Liu K H, Yan J C, Hu Q, et al. Effects of Parent Concrete and Mixing Method on the Resistance to Freezing and Thawing of Air-Entrained Recycled Aggregate Concrete[J]. Constr. Build. Mater., 2016, 106: 264-273.

[99] Pawluczuk E, Kalinowska-Wichrowska K, Bołtryk M, et al. The Influence of Heat and Mechanical Treatment of Concrete Rubble on the Properties of Recycled Aggregate Concrete[J]. Materials, 2019, 12(3): 367

[100] Purushothaman R, Amirthavalli R R, Karan L. Influence of Treatment Methods on the Strength and Performance Characteristics of Recycled Aggregate Concrete[J]. J. Mater. Civ. Eng., 2015, 27(5): 04 014 168

[101] Everaert M, Stein R, Michaux S, et al. Microwave Radiation as a Pre-treatment for Standard and Innovative Fragmentation Techniques in Concrete Recycling[J]. Materials, 2019, 12(3): 488

[102] Menard Y, Bru K, Touze S, et al. Innovative Process Routes for a High-Quality Concrete Recycling[J]. Waste Manage., 2013, 33(6): 1 561-1 565.

[103] Bru K, Touzé S, Bourgeois F, et al. Assessment of a Microwave-Assisted Recycling Process for the Recovery of High-Quality Aggregates from Concrete Waste[J]. Int. J. Miner. Process., 2014, 126: 90-98.

[104] Lippiatt N, Bourgeois F. Investigation of Microwave-Assisted Concrete Recycling Using Single-Particle Testing[J]. Miner. Eng., 2012, 31: 71-81.

[105] Akbarnezhad A, Ong K C G, Zhang M H, et al. Microwave-Assisted Beneficiation of Recycled Concrete Aggregates[J]. Constr. Build. Mater., 2011, 25(8): 3 469-3 479.

[106] Touzé S, Bru K, Ménard Y, et al. Electrical Fragmentation Applied to the Recycling of Concrete Waste - Effect on Aggregate Liberation[J]. Int. J. Miner. Process., 2017, 158: 68-75.

[107] Linß E, Mueller A. High-Performance Sonic Impulses - An Alternative Method for Processing of Concrete[J]. Int. J. Miner. Process., 2004, 74: S199-S208.

[108] Dimitriou G, Savva P, Petrou M F. Enhancing Mechanical and Durability Properties of Recycled Aggregate Concrete[J]. Constr. Build. Mater., 2018, 158: 228-235.

[109] Tsujino M, Noguchi T, Kitagaki R, et al. Completely Recyclable Concrete of Aggregate-Recovery Type by a New Technique Using Aggregate Coating[J]. J. Struct. Constr. Eng., AIJ, 2010, 75(647): 17-24.

[110] Tsujino M, Noguchi T, Kitagaki R, et al. Completely Recyclable Concrete of Aggregate-Recovery Type by Using Microwave Heating Technology[J]. J. Struct. Constr. Eng., AIJ, 2011, 76(660): 223-229.

[111] Choi H, Kitagaki R, Noguchi T. Effective Recycling of Surface Modification Aggregate Using Microwave Heating[J]. J. Adv. Concr. Technol., 2014, 12(2): 34-45.

[112] Choi H, Lim M, Choi H, et al. Using Microwave Heating to Completely Recycle Concrete[J]. J. Environ. Prot., 2014, 05(07): 583-596.

[113] Wu J Y, Zhang Y S, Zhu P H, et al. Mechanical Properties and ITZ Microstructure of Recycled Aggregate Concrete Using Carbonated Recycled Coarse Aggregate[J]. J. Wuhan Univ. Technol.-Mater. Sci. Ed., 2018, 33(3): 648-653.

[114] Pandurangan K, Dayanithy A, Om Prakash S. Influence of Treatment Methods on the Bond Strength of Recycled Aggregate Concrete[J]. Constr. Build. Mater., 2016, 120: 212-221.

[115] Kim Y J, Hanif A, Kazmi S M S, et al. Properties Enhancement of Recycled Aggregate Concrete through Pretreatment of Coarse Aggregates - Comparative Assessment of Assorted Techniques[J]. J. Cleaner Prod., 2018, 191: 339-349.

[116] Katkhuda H, Shatarat N. Shear Behavior of Reinforced Concrete Beams Using Treated Recycled Concrete Aggregate[J]. Constr. Build. Mater., 2016, 125: 63-71.

[117] Bui N K, Satomi T, Takahashi H. Enhancement of Recycled Aggregate Concrete Properties by a New Treatment Method[J]. Int. J. GEOMATE, 2018, 14(41): 68-76.

[118] Ismail S, Ramli M. Influence of Surface-Treated Coarse Recycled Concrete Aggregate on Compressive Strength of Concrete[J]. Int. J. Civ. Environ. Eng., 2014, 8(8): 881-885.

[119] Kim S S, Lee J B, Ko J S, et al. A Study on the Nano Silica-Sol Coating for Improving Performance of Recycled Aggregate[J]. J. Korea Inst. Struct. Maint. Insp., 2013, 17(4): 084-090.

[120] Li Y, Wang R J, Li S Y, et al. Assessment of the Freeze-Thaw Resistance of Concrete Incorporating Carbonated Coarse Recycled Concrete Aggregates[J]. J. Ceram. Soc. Jpn., 2017, 125(11): 837-845.

[121] Li L, Poon C S, Xiao J Z, et al. Effect of Carbonated Recycled Coarse Aggregate on the Dynamic Compressive Behavior of Recycled Aggregate Concrete[J]. Constr. Build. Mater., 2017, 151: 52-62.

[122] Qiu J S, Tng D Q S, Yang E H. Surface Treatment of Recycled Concrete Aggregates through Microbial Carbonate Precipitation[J]. Constr. Build. Mater., 2014, 57: 144-150.

[123] Byeon M W, Kim J W, Ahn J H. Mechanism and Reaction Characteristics for Adhered Mortar Removal of Recycled Aggregate Using Microwave and Mixed Solution of HCl and H2O2[J]. J. Korean Soc. Waste Manage., 2016, 33(4): 383-390.

[124] Santha Kumar G, Minocha A K. Studies on Thermo-Chemical Treatment of Recycled Concrete Fine Aggregates for Use in Concrete[J]. J. Mater. Cycles Waste Manage., 2018, 20(1): 469-480.

[125] Kim H S, Park S K, Kim H Y. The Optimum Production Method for Quality Improvement of Recycled Aggregates Using Sulfuric Acid and the Abrasion Method[J]. Int. J. Environ. Res. Public Health, 2016, 13(8): 769

[126] Kim H S, Kim J M, Kim B I. Quality Improvement of Recycled Fine Aggregate Using Steel Ball with the Help of Acid Treatment[J]. J. Mater. Cycles Waste Manage., 2018, 20(2): 754-765.

[127] Song I H, Ryou J S. Hybrid Techniques for Quality Improvement of Recycled Fine Aggregate[J]. Constr. Build. Mater., 2014, 72: 56-64.