Mechanical and microstructural properties of glass powder-modified recycled brick-concrete aggregate concrete
In order to achieve a better recycling of construction waste and explore the mechanical properties of concrete after incorporating multiple types of construction waste, this paper uses discarded concrete as recycled concrete aggregate (RCA), waste clay bricks as recycled fine brick aggregate (RFBA),...
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Elsevier
2025-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509525005182 |
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| author | Yi Zhao Yong Guo Yuzhou Sun Xiangming Zhou Zhiyu Min Qingli Lin Siwen Chen Yu Li Mingxu Jiang Aozhong Feng Shuailei Kang |
| author_facet | Yi Zhao Yong Guo Yuzhou Sun Xiangming Zhou Zhiyu Min Qingli Lin Siwen Chen Yu Li Mingxu Jiang Aozhong Feng Shuailei Kang |
| author_sort | Yi Zhao |
| collection | DOAJ |
| description | In order to achieve a better recycling of construction waste and explore the mechanical properties of concrete after incorporating multiple types of construction waste, this paper uses discarded concrete as recycled concrete aggregate (RCA), waste clay bricks as recycled fine brick aggregate (RFBA), and waste glass powder (GP) as an auxiliary cementitious material. Taking fully into account the modification effect of GP on the mortar matrix, a new type of green recycled concrete, namely GP modified Recycled Brick-Concrete Aggregate Concrete (GBCC), is prepared. Through a four-factor, four-level orthogonal experimental design combined with microstructural analyses (XRD, SEM, EDS, MIP), the mechanical properties and synergistic mechanisms of GBCC were systematically investigated. Results demonstrate that under the optimal mix ratio (15 % RCA, 40 % RFBA, 10 % GP, and water-binder ratio of 0.48), the 28-day cube compressive strength of GBCC reaches 39.2 MPa (equivalent to 100 % of C30 concrete), while the axial compressive strength and splitting tensile strength are 29.8 MPa and 2.72 MPa, respectively, meeting the design requirements of C30 concrete. Notably, at 40 % RFBA replacement, GBCC achieves over 90 % of the compressive strength of conventional C30 concrete. Microscopic analysis indicated that C-(A)-S-H gels formed by GP and RFBA reduced the total porosity by approximately 18 % (MIP test) and increased the proportion of harmless pores (<20 nm) to 25∼28 %, effectively refining the pore structure. SEM-EDS observations revealed dense gel filling at the interfacial transition zone, with the Ca/Si ratio of the gel reduced to 0.29, significantly enhancing interfacial bonding. This study pioneers the efficient co-utilization of RCA, RFBA, and GP, and for the first time integrates SEM-EDS microstructural characterization with molecular chemical analysis to elucidate the formation mechanisms of gels. |
| format | Article |
| id | doaj-art-90c4ce5074c24028a21de764d3feadfe |
| institution | OA Journals |
| issn | 2214-5095 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-90c4ce5074c24028a21de764d3feadfe2025-08-20T02:10:58ZengElsevierCase Studies in Construction Materials2214-50952025-07-0122e0472010.1016/j.cscm.2025.e04720Mechanical and microstructural properties of glass powder-modified recycled brick-concrete aggregate concreteYi Zhao0Yong Guo1Yuzhou Sun2Xiangming Zhou3Zhiyu Min4Qingli Lin5Siwen Chen6Yu Li7Mingxu Jiang8Aozhong Feng9Shuailei Kang10School of Intelligent Construction and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China; Henan Engineering Research Center of Mechanics and Engineering Structures, Zhongyuan University of Technology, Zhengzhou 450007, ChinaSchool of Intelligent Construction and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China; Henan Engineering Research Center of Mechanics and Engineering Structures, Zhongyuan University of Technology, Zhengzhou 450007, ChinaHenan Engineering Research Center of Mechanics and Engineering Structures, Zhongyuan University of Technology, Zhengzhou 450007, China; School of Civil and Traffic Engineering, Henan University of Urban Construction, Pingdingshan 467000, China; Corresponding author at: Henan Engineering Research Center of Mechanics and Engineering Structures, Zhongyuan University of Technology, Zhengzhou 450007, China.Department of Civil & Environmental Engineering, Brunel, University of London, Middlesex, Uxbridge UB8 3PH, United KingdomLow-Carbon Energy Engineering College, Henan Mechanical and Electrical Vocational College, Zhengzhou 451192, ChinaSchool of Intelligent Construction and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China; Henan Engineering Research Center of Mechanics and Engineering Structures, Zhongyuan University of Technology, Zhengzhou 450007, ChinaSchool of Intelligent Construction and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China; Henan Engineering Research Center of Mechanics and Engineering Structures, Zhongyuan University of Technology, Zhengzhou 450007, ChinaSchool of Intelligent Construction and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China; Henan Engineering Research Center of Mechanics and Engineering Structures, Zhongyuan University of Technology, Zhengzhou 450007, ChinaSchool of Intelligent Construction and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China; Henan Engineering Research Center of Mechanics and Engineering Structures, Zhongyuan University of Technology, Zhengzhou 450007, ChinaSchool of Intelligent Construction and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China; Henan Engineering Research Center of Mechanics and Engineering Structures, Zhongyuan University of Technology, Zhengzhou 450007, ChinaSchool of Intelligent Construction and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China; Henan Engineering Research Center of Mechanics and Engineering Structures, Zhongyuan University of Technology, Zhengzhou 450007, ChinaIn order to achieve a better recycling of construction waste and explore the mechanical properties of concrete after incorporating multiple types of construction waste, this paper uses discarded concrete as recycled concrete aggregate (RCA), waste clay bricks as recycled fine brick aggregate (RFBA), and waste glass powder (GP) as an auxiliary cementitious material. Taking fully into account the modification effect of GP on the mortar matrix, a new type of green recycled concrete, namely GP modified Recycled Brick-Concrete Aggregate Concrete (GBCC), is prepared. Through a four-factor, four-level orthogonal experimental design combined with microstructural analyses (XRD, SEM, EDS, MIP), the mechanical properties and synergistic mechanisms of GBCC were systematically investigated. Results demonstrate that under the optimal mix ratio (15 % RCA, 40 % RFBA, 10 % GP, and water-binder ratio of 0.48), the 28-day cube compressive strength of GBCC reaches 39.2 MPa (equivalent to 100 % of C30 concrete), while the axial compressive strength and splitting tensile strength are 29.8 MPa and 2.72 MPa, respectively, meeting the design requirements of C30 concrete. Notably, at 40 % RFBA replacement, GBCC achieves over 90 % of the compressive strength of conventional C30 concrete. Microscopic analysis indicated that C-(A)-S-H gels formed by GP and RFBA reduced the total porosity by approximately 18 % (MIP test) and increased the proportion of harmless pores (<20 nm) to 25∼28 %, effectively refining the pore structure. SEM-EDS observations revealed dense gel filling at the interfacial transition zone, with the Ca/Si ratio of the gel reduced to 0.29, significantly enhancing interfacial bonding. This study pioneers the efficient co-utilization of RCA, RFBA, and GP, and for the first time integrates SEM-EDS microstructural characterization with molecular chemical analysis to elucidate the formation mechanisms of gels.http://www.sciencedirect.com/science/article/pii/S2214509525005182Recycled coarse aggregate (RCA)Recycled fine brick aggregate (RFBA)Glass powder (GP)Orthogonal testMechanical propertiesMicroscopic mechanism |
| spellingShingle | Yi Zhao Yong Guo Yuzhou Sun Xiangming Zhou Zhiyu Min Qingli Lin Siwen Chen Yu Li Mingxu Jiang Aozhong Feng Shuailei Kang Mechanical and microstructural properties of glass powder-modified recycled brick-concrete aggregate concrete Case Studies in Construction Materials Recycled coarse aggregate (RCA) Recycled fine brick aggregate (RFBA) Glass powder (GP) Orthogonal test Mechanical properties Microscopic mechanism |
| title | Mechanical and microstructural properties of glass powder-modified recycled brick-concrete aggregate concrete |
| title_full | Mechanical and microstructural properties of glass powder-modified recycled brick-concrete aggregate concrete |
| title_fullStr | Mechanical and microstructural properties of glass powder-modified recycled brick-concrete aggregate concrete |
| title_full_unstemmed | Mechanical and microstructural properties of glass powder-modified recycled brick-concrete aggregate concrete |
| title_short | Mechanical and microstructural properties of glass powder-modified recycled brick-concrete aggregate concrete |
| title_sort | mechanical and microstructural properties of glass powder modified recycled brick concrete aggregate concrete |
| topic | Recycled coarse aggregate (RCA) Recycled fine brick aggregate (RFBA) Glass powder (GP) Orthogonal test Mechanical properties Microscopic mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S2214509525005182 |
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